RE: RE: [Xen-users] How to: Improve Network Throughput of a XEN kernel?

RE: RE: [Xen-users] How to: Improve Network Throughput of a XEN kernel?

[Mike Viau]

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>Any just first argument dummy=dummy should on kenel line.
> Read Wiki one more time. It works.

I believe you that it does work. I was able to see (XEN) messages coming from the hypervisor, but no matter how I changed the option I kept getting a kernel fault. 

I feel like it was time to stop mucking around with getting Ubuntu and the grub2 boot loader to work with XEN so I decided to install a headless OpenSUSE 11.2 system.

The openSUSE distribution supported Xen 3.4.1 tools, and had a 2.6.31.12 xenified kernel. On this setup I experience identical network performance.

~1MB/s - w/ xen kernel
~4.5 MB/s - w/ non-xen kernel

I use the e1000e kernel module driver for my Ethernet card.

Is this typical Dom0 (or Xen Host) network performance with a xenified kernel or is just in my two setups that one encounters such a network performance hit to the Dom0? 


-M


--- On Mon, 3/1/10, Mike Viau <viaum@sheridanc.on.ca> wrote:

From: Mike Viau <viaum@sheridanc.on.ca>
Subject: RE: [Xen-devel] RE: [Xen-users] How to: Improve Network Throughput of a XEN kernel?
To: bderzhavets@yahoo.com
Cc: xen-devel@lists.xensource.com, xen-users@lists.xensource.com
Date: Monday, March 1, 2010, 2:52 PM




Why using grub2 vs grub is baffling am not sure....

I think I'd prefer to use the kernel command line in grub2 so that the options may be changed easier laster on. However I still have been having so success with boot XEN with Ubuntu's grub2 boot loader.

Am I correct to conclude CONFIG_CMDLINE_BOL must = N to allow GRUB2 to pass kernel options?
http://cateee.net/lkddb/web-lkddb/CMDLINE_BOOL.html

I have read through the Wiki page at http://wiki.xensource.com/xenwiki/XenCommonProblems. I am running a 64-bit Xen Hypervisor.

Thus far I have been having no success with using the example entry found at http://old.nabble.com/Strange-interaction-from-grub2-and-XEN-td26464067.html

A question regarding that entry is what would be the root device when there are separate /boot and root partitions? I am using the partition with the /boot (grub2) as my 'set root' device right?

I am also using the dummy=dummy as the first option on the first module line, again as discovered on the wiki.

Additionally posted on another thread here in the Xen mailing list was:
> On 1 March 2010 08:09, Luke Carrier <luke.carrier@xinos.org> wrote:
>>
>> Not sure about Debian, but I know Ubuntu isn’t ideal for Xen any more
>> because of the presence of GRUB2 – the new boot loader doesn’t support
>> passing certain command lines and the current multiboot implementation
>> breaks the method Xen uses to load the
 Dom0 kernel – you can’t use Ubuntu
>> 9.10 Server with Xen.

I am confused now because Boris clearly created a wordpress.com weblog in where Ubuntu 9.10 Server was
used with XEN.

Lastly, out of curiosity, what (or what kind) of commands cannot be passed with GRUB2?


ThX!
 

-M




Date: Sat, 27 Feb 2010 11:20:31 -0800
From: bderzhavets@yahoo.com
Subject: Re: [Xen-devel] RE: [Xen-users] How to: Improve Network Throughput of	a XEN kernel?
To: mike.viau@sheridanc.on.ca
CC: xen-devel@lists.xensource.com; xen-users@lists.xensource.com

In Xen Wiki is mentioned , that parameters for kernel may be set via command line as follows:-
************************************************************************************************************
module (hd1,10)/vmlinuz-2.6.31.8  dummy=dummy  root=/dev/sda7 ro
 console=tty0
************************************************************************************************************
# cat /proc/cmdline

shows that GRUB2 skips first argument, what causes problem.

Compiling built-in CMD_LINE is just an option.
Read all Wiki written by Pasi and  you would never be surprised ;)

> P.S: What is
your feeling on using a recent Ubuntu system with 
> grub-legacy as the boot
loader? I noticed that Squeeze has adopted grub2 > package as well too...

I have development Xen 3.4.3 instance on top Ubuntu 9.10 Server with GRUB2 ( baremetall) loading any from 3 mentioned bellow kernels under Xen 3.4.3

1.)  2.6.32.9 PVOPS
2.)  2.6.31.6 PVOPS
3.)  2.6.31.12 xenified

with no problems with dummy=dummy as first parameter ( thanks Pasi).
It may also may be done via compiling kernels with built-in CMD_LINE.
It works fine as well.

Boris.











--- On Sat, 2/27/10, Mike Viau <viaum@sheridanc.on.ca> wrote:

From: Mike Viau <viaum@sheridanc.on.ca>
Subject: [Xen-devel] RE: [Xen-users] How to: Improve Network Throughput of a XEN kernel?
To: bderzhavets@yahoo.com
Cc: xen-devel@lists.xensource.com,
 xen-users@lists.xensource.com
Date: Saturday, February 27, 2010, 12:03 PM






Yes,
thank you Boris for pointing that out. I found that was defiantly true. The 3.2.1 xen
hypervisor could only boot the 2.6.26-2 xen kernel and the xenified 2.6.31.12.



Additionally I found that:

 

Xend does
not start when using pv_ops dom0 kernel? 

In
December 2009 pv_ops dom0 kernel modules were renamed to have a
"xen-" prefix in them, ie. "evtchn.ko" became
"xen-evtchn.ko".  

This
makes Xen 3.4.x xend fail to start, because it tried to load
"evtchn.ko", but that doesn't exist. You need to load
"xen-evtchn.ko" and then start xend. Fedora 12 xen-3.4.2-2 rpms have
this problem fixed.  

Also make
sure you have xenfs mounted to "/proc/xen", that's needed aswell. 



[Source: http://wiki.xensource.com/xenwiki/XenParavirtOps]



And it appears the Debian xen-3.4.2-2 debs (in squeeze) have not fixed
this problem.



Lastly I am still doing some reading on the grub2 package and how to configure it. It turns out
that I have been using grub-legacy (or just good old grub) for so long that
configuring the grub2 boot loader is turning out to be my own personal
kryptonite. 

   

I am
still working on getting the hypervisor to load the dom0 kernel in a Ubuntu system. 

   

I have
noticed an example in your wordpress @ Set up Xen 3.4.3-rc2 & Libvirt 0.7.0 Dom0 (with 2.6.31.8
xenified aka Suse kernel) on top of Ubuntu 9.10 Server 

   

With
CONFIG_CMDLINE="root=/dev/sdb11 ro console=tty0" 

   

menuentry "Xen 3.4 / Ubuntu 9.10 kernel 2.6.31.8 xenified" {

insmod ext2

set root=(hd1,10)

multiboot (hd1,10)/xen-3.4.gz

module (hd1,10)/vmlinuz-2.6.31.8

module (hd1,10)/initrd-2.6.31.8.img

} 

   

I am sure
you wouldn't of mentioned the CONFIG_CMDLINE kernel option is it was not
important for using with grub2 right? I have not have to compile a kernel with the command line previous as I was just able to supply the arguments on the kernel line of my menu.lst (grub configuration file). 


 

P.S: What is
your feeling on using a recent Ubuntu system with grub-legacy as the boot
loader? I noticed that Squeeze has adopted grub2 package as well too... 


 



-M




Date: Sat, 27 Feb 2010 04:32:59 -0800
From: bderzhavets@yahoo.com
Subject: Re: FW: [Xen-users] How to: Improve Network Throughput of a XEN	kernel?
To: jbeulich@novell.com; mike.viau@sheridanc.on.ca
CC: xen-devel@lists.xensource.com; xen-users@lists.xensource.com

You cannot load pvops kernel under xen-hypervisor 3.2.1  ( >=3.4.0 in general)

Boris.

--- On Fri, 2/26/10, Mike Viau <viaum@sheridanc.on.ca> wrote:

From: Mike Viau <viaum@sheridanc.on.ca>
Subject: FW: [Xen-users] How to: Improve Network Throughput of a XEN
 kernel?
To: bderzhavets@yahoo.com, jbeulich@novell.com
Cc: xen-users@lists.xensource.com, xen-devel@lists.xensource.com
Date: Friday, February 26, 2010, 3:19 PM




Hello again,

Just a quick update...

I was really hoping it was just going to be an issue with the kernel .config, however I copied exact configuration from the working Debain 2.6.26-2-xen-amd64 kernel and used a make oldconfig but the end result was the same.

After booting the xenified (2.6.31.12) or pvops kernel (2.6.31.6) via both xen-hypervisor 3.2.1 or xen-hypervisor 3.4.2 the maximum data transfer to/from the Dom0 (Xen host) is ~1MB/s.

Next I plan on re-trying my efforts on a Ubuntu system to see if same network bottlenecking is present.
 		 	   		  


Date: Fri, 26 Feb 2010 09:16:59 -0800
From: bderzhavets@yahoo.com
Subject: Re: [Xen-users] How to: Improve Network Throughput of a XEN kernel?
To: xen-users@lists.xensource.com; viaum@sheridanc.on.ca

Would escalate to xen-devel.  2.6.31.8 (12) aka Suse xenified  was Jan Beulich stuff.
He might have an answer.
Boris.

--- On Fri, 2/26/10, Mike Viau <viaum@sheridanc.on.ca> wrote:

From: Mike Viau <viaum@sheridanc.on.ca>
Subject: [Xen-users] How to: Improve Network Throughput of a XEN kernel?
To: xen-users@lists.xensource.com
Cc: waldi@debian.org
Date: Friday, February 26, 2010, 12:09 PM















Hi there,

I am starting a new thread to try and solve a problem I am having will slow network throughput to the XEN host (not to a domU).

I have confirmed my problem occurs with PVOPS  'xen/master' kernel as well using http://pasik.reaktio.net/xen/pv_ops-dom0-debug/config-2.6.31.6-pvops-dom0-xen-master-x86_64 as the .config.

It also occurs with a forward ported xenified kernel (2.6.31.12) using the attached config-11-xen (.config).

However when using the xen kernel found in debain lenny (2.6.26-2) for the amd64 architecture I get similiar transfer rates to my Xen host as I do on a baremetel kernel.

Bastian Blank perhaps you could point me in the right direction in regards to a debian specific customization or patch I should be aware of?

Maxium transfer rate (to/from
 hard disk) using the PVOPS  'xen/master' kernel and forward ported xenified kernel (2.6.31.12) is bottlenecking at ~1MB/s. On the debain lenny xen kernel I am getting ~4.5MB/s.

I was
hoping one could suggest options in the .config that might be modified
in order to improve network throughput of a XEN kernel and therefor increase the data transfer rates over the netowork to and from the Xen host.

Thanks alot for any help! As always I will be willing to accept any suggestions :)


-M

 		 	   		  
 		 	   		  
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Re: [Xen-devel] RE: How to: Improve Network Throughput of a XEN kernel?

[Keir Fraser]

On 03/03/2010 00:50, "Mike Viau" <viaum@sheridanc.on.ca> wrote:

> The openSUSE distribution supported Xen 3.4.1 tools, and had a 2.6.31.12
> xenified kernel. On this setup I experience identical network performance.
> 
> ~1MB/s - w/ xen kernel
> ~4.5 MB/s - w/ non-xen kernel

How/what are you measuring? Both those numbers are crap for a gigabit NIC.
They're poor even for Fast Ethernet.

Huge performance differences between dom0 and native are unusual. But
normally you can max the card in both cases, with CPU headroom to spare.

 -- Keir

> I use the e1000e kernel module driver for my Ethernet card.
> 
> Is this typical Dom0 (or Xen Host) network performance with a xenified kernel
> or is just in my two setups that one encounters such a network performance hit
> to the Dom0? 

Re: [Xen-devel] RE: How to: Improve Network Throughput of a XEN kernel?

[Pasi Kärkkäinen]

On Tue, Mar 02, 2010 at 07:50:59PM -0500, Mike Viau wrote:
> >Any just first argument dummy=dummy should on kenel line.
> > Read Wiki one more time. It works.
> 
> I believe you that it does work. I was able to see (XEN) messages coming from the hypervisor, but no matter how I changed the option I kept getting a kernel fault.
> 
> I feel like it was time to stop mucking around with getting Ubuntu and the grub2 boot loader to work with XEN so I decided to install a headless OpenSUSE 11.2 system.
> 
> The openSUSE distribution supported Xen 3.4.1 tools, and had a 2.6.31.12 xenified kernel. On this setup I experience identical network performance.
> 
> ~1MB/s - w/ xen kernel
> ~4.5 MB/s - w/ non-xen kernel
> 
> I use the e1000e kernel module driver for my Ethernet card.
> 
> Is this typical Dom0 (or Xen Host) network performance with a xenified kernel or is just in my two setups that one encounters such a network performance hit to the Dom0?
>

No, it's not typical.

How are you measuring the performance? In a gigabit network you should be able
to push around 110 MB/sec.. 4.5 MB/sec sounds really slow.
 
-- Pasi

> -M
> 
> --- On Mon, 3/1/10, Mike Viau <viaum@sheridanc.on.ca> wrote:
> 
>   From: Mike Viau <viaum@sheridanc.on.ca>
>   Subject: RE: [Xen-devel] RE: [Xen-users] How to: Improve Network Throughput of a XEN kernel?
>   To: bderzhavets@yahoo.com
>   Cc: xen-devel@lists.xensource.com, xen-users@lists.xensource.com
>   Date: Monday, March 1, 2010, 2:52 PM
> 
>   Why using grub2 vs grub is baffling am not sure....
> 
>   I think I'd prefer to use the kernel command line in grub2 so that the options may be changed easier laster on. However I still have been having so success with boot
>   XEN with Ubuntu's grub2 boot loader.
> 
>   Am I correct to conclude CONFIG_CMDLINE_BOL must = N to allow GRUB2 to pass kernel options?
>   [1]http://cateee.net/lkddb/web-lkddb/CMDLINE_BOOL.html
> 
>   I have read through the Wiki page at [2]http://wiki.xensource.com/xenwiki/XenCommonProblems. I am running a 64-bit Xen Hypervisor.
> 
>   Thus far I have been having no success with using the example entry found at [3]http://old.nabble.com/Strange-interaction-from-grub2-and-XEN-td26464067.html
> 
>   A question regarding that entry is what would be the root device when there are separate /boot and root partitions? I am using the partition with the /boot (grub2) as
>   my 'set root' device right?
> 
>   I am also using the dummy=dummy as the first option on the first module line, again as discovered on the wiki.
> 
>   Additionally posted on another thread here in the Xen mailing list was:
> 
>  > On 1 March 2010 08:09, Luke Carrier <luke.carrier@xinos.org> wrote:
>  >>
>  >> Not sure about Debian, but I know Ubuntu isn*t ideal for Xen any more
>  >> because of the presence of GRUB2 * the new boot loader doesn*t support
>  >> passing certain command lines and the current multiboot implementation
>  >> breaks the method Xen uses to load the
>   Dom0 kernel * you can*t use Ubuntu
>  >> 9.10 Server with Xen.
> 
>  I am confused now because Boris clearly created a wordpress.com weblog in where Ubuntu 9.10 Server was
>  used with XEN.
> 
>  Lastly, out of curiosity, what (or what kind) of commands cannot be passed with GRUB2?
> 
>  ThX!
> 
> 
>   -M
> 
> --------------------------------------------------------------------------------------------------------------------------------------------------------------------------
> 
>   Date: Sat, 27 Feb 2010 11:20:31 -0800
>   From: bderzhavets@yahoo.com
>   Subject: Re: [Xen-devel] RE: [Xen-users] How to: Improve Network Throughput of a XEN kernel?
>   To: mike.viau@sheridanc.on.ca
>   CC: xen-devel@lists.xensource.com; xen-users@lists.xensource.com
> 
>   In Xen Wiki is mentioned , that parameters for kernel may be set via command line as follows:-
>   ************************************************************************************************************
>   module (hd1,10)/vmlinuz-2.6.31.8  dummy=dummy  root=/dev/sda7 ro console=tty0
>   ************************************************************************************************************
>   # cat /proc/cmdline
> 
>   shows that GRUB2 skips first argument, what causes problem.
> 
>   Compiling built-in CMD_LINE is just an option.
>   Read all Wiki written by Pasi and  you would never be surprised ;)
> 
>   > P.S: What is your feeling on using a recent Ubuntu system with
>   > grub-legacy as the boot loader? I noticed that Squeeze has adopted grub2 > package as well too...
> 
>   I have development Xen 3.4.3 instance on top Ubuntu 9.10 Server with GRUB2 ( baremetall) loading any from 3 mentioned bellow kernels under Xen 3.4.3
> 
>   1.)  2.6.32.9 PVOPS
>   2.)  2.6.31.6 PVOPS
>   3.)  2.6.31.12 xenified
> 
>   with no problems with dummy=dummy as first parameter ( thanks Pasi).
>   It may also may be done via compiling kernels with built-in CMD_LINE.
>   It works fine as well.
> 
>   Boris.
> 
>   --- On Sat, 2/27/10, Mike Viau <viaum@sheridanc.on.ca> wrote:
> 
>     From: Mike Viau <viaum@sheridanc.on.ca>
>     Subject: [Xen-devel] RE: [Xen-users] How to: Improve Network Throughput of a XEN kernel?
>     To: bderzhavets@yahoo.com
>     Cc: xen-devel@lists.xensource.com, xen-users@lists.xensource.com
>     Date: Saturday, February 27, 2010, 12:03 PM
> 
>     Yes, thank you Boris for pointing that out. I found that was defiantly true. The 3.2.1 xen hypervisor could only boot the 2.6.26-2 xen kernel and the xenified
>     2.6.31.12.
> 
>     Additionally I found that:
> 
>     Xend does not start when using pv_ops dom0 kernel?
> 
>     In December 2009 pv_ops dom0 kernel modules were renamed to have a "xen-" prefix in them, ie. "evtchn.ko" became "xen-evtchn.ko".
> 
>     This makes Xen 3.4.x xend fail to start, because it tried to load "evtchn.ko", but that doesn't exist. You need to load "xen-evtchn.ko" and then start xend. Fedora 12
>     xen-3.4.2-2 rpms have this problem fixed.
> 
>     Also make sure you have xenfs mounted to "/proc/xen", that's needed aswell.
> 
>     [Source: [4]http://wiki.xensource.com/xenwiki/XenParavirtOps]
> 
>     And it appears the Debian xen-3.4.2-2 debs (in squeeze) have not fixed this problem.
> 
>     Lastly I am still doing some reading on the grub2 package and how to configure it. It turns out that I have been using grub-legacy (or just good old grub) for so long
>     that configuring the grub2 boot loader is turning out to be my own personal kryptonite.
> 
> 
> 
>     I am still working on getting the hypervisor to load the dom0 kernel in a Ubuntu system.
> 
> 
> 
>     I have noticed an example in your wordpress @ [5]Set up Xen 3.4.3-rc2 & Libvirt 0.7.0 Dom0 (with 2.6.31.8 xenified aka Suse kernel) on top of Ubuntu 9.10 Server
> 
> 
> 
>     With CONFIG_CMDLINE="root=/dev/sdb11 ro console=tty0"
> 
> 
> 
>     menuentry "Xen 3.4 / Ubuntu 9.10 kernel 2.6.31.8 xenified" {
>     insmod ext2
>     set root=(hd1,10)
>     multiboot (hd1,10)/xen-3.4.gz
>     module (hd1,10)/vmlinuz-2.6.31.8
>     module (hd1,10)/initrd-2.6.31.8.img
>     }
> 
> 
> 
>     I am sure you wouldn't of mentioned the CONFIG_CMDLINE kernel option is it was not important for using with grub2 right? I have not have to compile a kernel with the
>     command line previous as I was just able to supply the arguments on the kernel line of my menu.lst (grub configuration file).
> 
>     P.S: What is your feeling on using a recent Ubuntu system with grub-legacy as the boot loader? I noticed that Squeeze has adopted grub2 package as well too...
> 
> 
>     -M
> 
>   ------------------------------------------------------------------------------------------------------------------------------------------------------------------------
> 
>     Date: Sat, 27 Feb 2010 04:32:59 -0800
>     From: bderzhavets@yahoo.com
>     Subject: Re: FW: [Xen-users] How to: Improve Network Throughput of a XEN kernel?
>     To: jbeulich@novell.com; mike.viau@sheridanc.on.ca
>     CC: xen-devel@lists.xensource.com; xen-users@lists.xensource.com
> 
>     You cannot load pvops kernel under xen-hypervisor 3.2.1  ( >=3.4.0 in general)
> 
>     Boris.
> 
>     --- On Fri, 2/26/10, Mike Viau <viaum@sheridanc.on.ca> wrote:
> 
>       From: Mike Viau <viaum@sheridanc.on.ca>
>       Subject: FW: [Xen-users] How to: Improve Network Throughput of a XEN kernel?
>       To: bderzhavets@yahoo.com, jbeulich@novell.com
>       Cc: xen-users@lists.xensource.com, xen-devel@lists.xensource.com
>       Date: Friday, February 26, 2010, 3:19 PM
> 
>       Hello again,
> 
>       Just a quick update...
> 
>       I was really hoping it was just going to be an issue with the kernel .config, however I copied exact configuration from the working Debain 2.6.26-2-xen-amd64 kernel
>       and used a make oldconfig but the end result was the same.
> 
>       After booting the xenified (2.6.31.12) or pvops kernel (2.6.31.6) via both xen-hypervisor 3.2.1 or xen-hypervisor 3.4.2 the maximum data transfer to/from the Dom0
>       (Xen host) is ~1MB/s.
> 
>       Next I plan on re-trying my efforts on a Ubuntu system to see if same network bottlenecking is present.
> 
>     ----------------------------------------------------------------------------------------------------------------------------------------------------------------------
> 
>       Date: Fri, 26 Feb 2010 09:16:59 -0800
>       From: bderzhavets@yahoo.com
>       Subject: Re: [Xen-users] How to: Improve Network Throughput of a XEN kernel?
>       To: xen-users@lists.xensource.com; viaum@sheridanc.on.ca
> 
>       Would escalate to xen-devel.  2.6.31.8 (12) aka Suse xenified  was Jan Beulich stuff.
>       He might have an answer.
>       Boris.
> 
>       --- On Fri, 2/26/10, Mike Viau <viaum@sheridanc.on.ca> wrote:
> 
>         From: Mike Viau <viaum@sheridanc.on.ca>
>         Subject: [Xen-users] How to: Improve Network Throughput of a XEN kernel?
>         To: xen-users@lists.xensource.com
>         Cc: waldi@debian.org
>         Date: Friday, February 26, 2010, 12:09 PM
> 
>         Hi there,
> 
>         I am starting a new thread to try and solve a problem I am having will slow network throughput to the XEN host (not to a domU).
> 
>         I have confirmed my problem occurs with PVOPS 'xen/master' kernel as well using
>         [6]http://pasik.reaktio.net/xen/pv_ops-dom0-debug/config-2.6.31.6-pvops-dom0-xen-master-x86_64 as the .config.
> 
>         It also occurs with a forward ported xenified kernel (2.6.31.12) using the attached config-11-xen (.config).
> 
>         However when using the xen kernel found in debain lenny (2.6.26-2) for the amd64 architecture I get similiar transfer rates to my Xen host as I do on a baremetel
>         kernel.
> 
>         Bastian Blank perhaps you could point me in the right direction in regards to a debian specific customization or patch I should be aware of?
>         Maxium transfer rate (to/from hard disk) using the PVOPS 'xen/master' kernel and forward ported xenified kernel (2.6.31.12) is bottlenecking at ~1MB/s. On the
>         debain lenny xen kernel I am getting ~4.5MB/s.
> 
>         I was hoping one could suggest options in the .config that might be modified in order to improve network throughput of a XEN kernel and therefor increase the data
>         transfer rates over the netowork to and from the Xen host.
> 
>         Thanks alot for any help! As always I will be willing to accept any suggestions :)
> 
>         -M
> 
>     ----------------------------------------------------------------------------------------------------------------------------------------------------------------------
> 
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> References
> 
>    Visible links
>    1. http://cateee.net/lkddb/web-lkddb/CMDLINE_BOOL.html
>    2. http://wiki.xensource.com/xenwiki/XenCommonProblems
>    3. http://old.nabble.com/Strange-interaction-from-grub2-and-XEN-td26464067.html
>    4. http://wiki.xensource.com/xenwiki/XenParavirtOps
>    5. Permanent Link: Set up Xen 3.4.3-rc2 & Libvirt 0.7.0 Dom0 (with 2.6.31.8 xenified aka Suse kernel) on top of Ubuntu 9.10\x01Server
> 	http://bderzhavets.wordpress.com/2010/01/04/set-up-xen-3-4-3-rc1-libvirt-0-7-0-dom0-with-2-6-31-8-xenified-aka-suse-kernel-on-top-of-ubuntu-9-10-server/
>    6. http://pasik.reaktio.net/xen/pv_ops-dom0-debug/config-2.6.31.6-pvops-dom0-xen-master-x86_64
>    7. http://go.microsoft.com/?linkid=9708120
>    8. http://go.microsoft.com/?linkid=9708117
>    9. http://mc/compose?to=Xen-devel@lists.xensource.com
>   10. http://lists.xensource.com/xen-devel
>   11. http://go.microsoft.com/?linkid=9708118
>   12. http://mc/compose?to=Xen-users@lists.xensource.com
>   13. http://lists.xensource.com/xen-users
>   14. http://go.microsoft.com/?linkid=9712960

> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xensource.com
> http://lists.xensource.com/xen-devel

RE: RE: [Xen-users] How to: Improve Network Throughput of a XEN kernel?

[Mike Viau]

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> 
> On Tue, Mar 02, 2010 at 07:50:59PM -0500, Mike Viau wrote:
> > >Any just first argument dummy=dummy should on kenel line.
> > > Read Wiki one more time. It works.
> > 
> > I believe you that it does work. I was able to see (XEN) messages coming from the hypervisor, but no matter how I changed the option I kept getting a kernel fault.
> > 
> > I feel like it was time to stop mucking around with getting Ubuntu and the grub2 boot loader to work with XEN so I decided to install a headless OpenSUSE 11.2 system.
> > 
> > The openSUSE distribution supported Xen 3.4.1 tools, and had a 2.6.31.12 xenified kernel. On this setup I experience identical network performance.
> > 
> > ~1MB/s - w/ xen kernel
> > ~4.5 MB/s - w/ non-xen kernel
> > 
> > I use the e1000e kernel module driver for my Ethernet card.
> > 
> > Is this typical Dom0 (or Xen Host) network performance with a xenified kernel or is just in my two setups that one encounters such a network performance hit to the Dom0?
> >
> 
> No, it's not typical.
> 
> How are you measuring the performance? In a gigabit network you should be able
> to push around 110 MB/sec.. 4.5 MB/sec sounds really slow.


I am using Fast Ethernet (100MB). What sort of throughput should I expect becasue I also believe ~1MB is too slow, even just to/from the Dom0, without any network emulation to the DomUs.

I simply used SCP, HTTP, and FTP file transfer protocols on the Xen host to another computer on the LAN. The ~4.5MB/s bottleneck is the hard drive on the other computer so I suspect the true bandwidth would be higher, but getting past the ~1MB/s roadblock is my major concern.

I have tried two linux distros and both forward ported xenified and parvirtualized xen kernel.

Does the Xen hypervisor have any effect on the network throughput? Would updating the Intel E1000E kernel module driver affect the network throughput?


-M



>  
> -- Pasi
> 
> > -M
> > 
> > --- On Mon, 3/1/10, Mike Viau <viaum@sheridanc.on.ca> wrote:
> > 
> >   From: Mike Viau <viaum@sheridanc.on.ca>
> >   Subject: RE: [Xen-devel] RE: [Xen-users] How to: Improve Network Throughput of a XEN kernel?
> >   To: bderzhavets@yahoo.com
> >   Cc: xen-devel@lists.xensource.com, xen-users@lists.xensource.com
> >   Date: Monday, March 1, 2010, 2:52 PM
> > 
> >   Why using grub2 vs grub is baffling am not sure....
> > 
> >   I think I'd prefer to use the kernel command line in grub2 so that the options may be changed easier laster on. However I still have been having so success with boot
> >   XEN with Ubuntu's grub2 boot loader.
> > 
> >   Am I correct to conclude CONFIG_CMDLINE_BOL must = N to allow GRUB2 to pass kernel options?
> >   [1]http://cateee.net/lkddb/web-lkddb/CMDLINE_BOOL.html
> > 
> >   I have read through the Wiki page at [2]http://wiki.xensource.com/xenwiki/XenCommonProblems. I am running a 64-bit Xen Hypervisor.
> > 
> >   Thus far I have been having no success with using the example entry found at [3]http://old.nabble.com/Strange-interaction-from-grub2-and-XEN-td26464067.html
> > 
> >   A question regarding that entry is what would be the root device when there are separate /boot and root partitions? I am using the partition with the /boot (grub2) as
> >   my 'set root' device right?
> > 
> >   I am also using the dummy=dummy as the first option on the first module line, again as discovered on the wiki.
> > 
> >   Additionally posted on another thread here in the Xen mailing list was:
> > 
> >  > On 1 March 2010 08:09, Luke Carrier <luke.carrier@xinos.org> wrote:
> >  >>
> >  >> Not sure about Debian, but I know Ubuntu isn*t ideal for Xen any more
> >  >> because of the presence of GRUB2 * the new boot loader doesn*t support
> >  >> passing certain command lines and the current multiboot implementation
> >  >> breaks the method Xen uses to load the
> >   Dom0 kernel * you can*t use Ubuntu
> >  >> 9.10 Server with Xen.
> > 
> >  I am confused now because Boris clearly created a wordpress.com weblog in where Ubuntu 9.10 Server was
> >  used with XEN.
> > 
> >  Lastly, out of curiosity, what (or what kind) of commands cannot be passed with GRUB2?
> > 
> >  ThX!
> > 
> > 
> >   -M
> > 
> > --------------------------------------------------------------------------------------------------------------------------------------------------------------------------
> > 
> >   Date: Sat, 27 Feb 2010 11:20:31 -0800
> >   From: bderzhavets@yahoo.com
> >   Subject: Re: [Xen-devel] RE: [Xen-users] How to: Improve Network Throughput of a XEN kernel?
> >   To: mike.viau@sheridanc.on.ca
> >   CC: xen-devel@lists.xensource.com; xen-users@lists.xensource.com
> > 
> >   In Xen Wiki is mentioned , that parameters for kernel may be set via command line as follows:-
> >   ************************************************************************************************************
> >   module (hd1,10)/vmlinuz-2.6.31.8  dummy=dummy  root=/dev/sda7 ro console=tty0
> >   ************************************************************************************************************
> >   # cat /proc/cmdline
> > 
> >   shows that GRUB2 skips first argument, what causes problem.
> > 
> >   Compiling built-in CMD_LINE is just an option.
> >   Read all Wiki written by Pasi and  you would never be surprised ;)
> > 
> >   > P.S: What is your feeling on using a recent Ubuntu system with
> >   > grub-legacy as the boot loader? I noticed that Squeeze has adopted grub2 > package as well too...
> > 
> >   I have development Xen 3.4.3 instance on top Ubuntu 9.10 Server with GRUB2 ( baremetall) loading any from 3 mentioned bellow kernels under Xen 3.4.3
> > 
> >   1.)  2.6.32.9 PVOPS
> >   2.)  2.6.31.6 PVOPS
> >   3.)  2.6.31.12 xenified
> > 
> >   with no problems with dummy=dummy as first parameter ( thanks Pasi).
> >   It may also may be done via compiling kernels with built-in CMD_LINE.
> >   It works fine as well.
> > 
> >   Boris.
> > 
> >   --- On Sat, 2/27/10, Mike Viau <viaum@sheridanc.on.ca> wrote:
> > 
> >     From: Mike Viau <viaum@sheridanc.on.ca>
> >     Subject: [Xen-devel] RE: [Xen-users] How to: Improve Network Throughput of a XEN kernel?
> >     To: bderzhavets@yahoo.com
> >     Cc: xen-devel@lists.xensource.com, xen-users@lists.xensource.com
> >     Date: Saturday, February 27, 2010, 12:03 PM
> > 
> >     Yes, thank you Boris for pointing that out. I found that was defiantly true. The 3.2.1 xen hypervisor could only boot the 2.6.26-2 xen kernel and the xenified
> >     2.6.31.12.
> > 
> >     Additionally I found that:
> > 
> >     Xend does not start when using pv_ops dom0 kernel?
> > 
> >     In December 2009 pv_ops dom0 kernel modules were renamed to have a "xen-" prefix in them, ie. "evtchn.ko" became "xen-evtchn.ko".
> > 
> >     This makes Xen 3.4.x xend fail to start, because it tried to load "evtchn.ko", but that doesn't exist. You need to load "xen-evtchn.ko" and then start xend. Fedora 12
> >     xen-3.4.2-2 rpms have this problem fixed.
> > 
> >     Also make sure you have xenfs mounted to "/proc/xen", that's needed aswell.
> > 
> >     [Source: [4]http://wiki.xensource.com/xenwiki/XenParavirtOps]
> > 
> >     And it appears the Debian xen-3.4.2-2 debs (in squeeze) have not fixed this problem.
> > 
> >     Lastly I am still doing some reading on the grub2 package and how to configure it. It turns out that I have been using grub-legacy (or just good old grub) for so long
> >     that configuring the grub2 boot loader is turning out to be my own personal kryptonite.
> > 
> > 
> > 
> >     I am still working on getting the hypervisor to load the dom0 kernel in a Ubuntu system.
> > 
> > 
> > 
> >     I have noticed an example in your wordpress @ [5]Set up Xen 3.4.3-rc2 & Libvirt 0.7.0 Dom0 (with 2.6.31.8 xenified aka Suse kernel) on top of Ubuntu 9.10 Server
> > 
> > 
> > 
> >     With CONFIG_CMDLINE="root=/dev/sdb11 ro console=tty0"
> > 
> > 
> > 
> >     menuentry "Xen 3.4 / Ubuntu 9.10 kernel 2.6.31.8 xenified" {
> >     insmod ext2
> >     set root=(hd1,10)
> >     multiboot (hd1,10)/xen-3.4.gz
> >     module (hd1,10)/vmlinuz-2.6.31.8
> >     module (hd1,10)/initrd-2.6.31.8.img
> >     }
> > 
> > 
> > 
> >     I am sure you wouldn't of mentioned the CONFIG_CMDLINE kernel option is it was not important for using with grub2 right? I have not have to compile a kernel with the
> >     command line previous as I was just able to supply the arguments on the kernel line of my menu.lst (grub configuration file).
> > 
> >     P.S: What is your feeling on using a recent Ubuntu system with grub-legacy as the boot loader? I noticed that Squeeze has adopted grub2 package as well too...
> > 
> > 
> >     -M
> > 
> >   ------------------------------------------------------------------------------------------------------------------------------------------------------------------------
> > 
> >     Date: Sat, 27 Feb 2010 04:32:59 -0800
> >     From: bderzhavets@yahoo.com
> >     Subject: Re: FW: [Xen-users] How to: Improve Network Throughput of a XEN kernel?
> >     To: jbeulich@novell.com; mike.viau@sheridanc.on.ca
> >     CC: xen-devel@lists.xensource.com; xen-users@lists.xensource.com
> > 
> >     You cannot load pvops kernel under xen-hypervisor 3.2.1  ( >=3.4.0 in general)
> > 
> >     Boris.
> > 
> >     --- On Fri, 2/26/10, Mike Viau <viaum@sheridanc.on.ca> wrote:
> > 
> >       From: Mike Viau <viaum@sheridanc.on.ca>
> >       Subject: FW: [Xen-users] How to: Improve Network Throughput of a XEN kernel?
> >       To: bderzhavets@yahoo.com, jbeulich@novell.com
> >       Cc: xen-users@lists.xensource.com, xen-devel@lists.xensource.com
> >       Date: Friday, February 26, 2010, 3:19 PM
> > 
> >       Hello again,
> > 
> >       Just a quick update...
> > 
> >       I was really hoping it was just going to be an issue with the kernel .config, however I copied exact configuration from the working Debain 2.6.26-2-xen-amd64 kernel
> >       and used a make oldconfig but the end result was the same.
> > 
> >       After booting the xenified (2.6.31.12) or pvops kernel (2.6.31.6) via both xen-hypervisor 3.2.1 or xen-hypervisor 3.4.2 the maximum data transfer to/from the Dom0
> >       (Xen host) is ~1MB/s.
> > 
> >       Next I plan on re-trying my efforts on a Ubuntu system to see if same network bottlenecking is present.
> > 
> >     ----------------------------------------------------------------------------------------------------------------------------------------------------------------------
> > 
> >       Date: Fri, 26 Feb 2010 09:16:59 -0800
> >       From: bderzhavets@yahoo.com
> >       Subject: Re: [Xen-users] How to: Improve Network Throughput of a XEN kernel?
> >       To: xen-users@lists.xensource.com; viaum@sheridanc.on.ca
> > 
> >       Would escalate to xen-devel.  2.6.31.8 (12) aka Suse xenified  was Jan Beulich stuff.
> >       He might have an answer.
> >       Boris.
> > 
> >       --- On Fri, 2/26/10, Mike Viau <viaum@sheridanc.on.ca> wrote:
> > 
> >         From: Mike Viau <viaum@sheridanc.on.ca>
> >         Subject: [Xen-users] How to: Improve Network Throughput of a XEN kernel?
> >         To: xen-users@lists.xensource.com
> >         Cc: waldi@debian.org
> >         Date: Friday, February 26, 2010, 12:09 PM
> > 
> >         Hi there,
> > 
> >         I am starting a new thread to try and solve a problem I am having will slow network throughput to the XEN host (not to a domU).
> > 
> >         I have confirmed my problem occurs with PVOPS 'xen/master' kernel as well using
> >         [6]http://pasik.reaktio.net/xen/pv_ops-dom0-debug/config-2.6.31.6-pvops-dom0-xen-master-x86_64 as the .config.
> > 
> >         It also occurs with a forward ported xenified kernel (2.6.31.12) using the attached config-11-xen (.config).
> > 
> >         However when using the xen kernel found in debain lenny (2.6.26-2) for the amd64 architecture I get similiar transfer rates to my Xen host as I do on a baremetel
> >         kernel.
> > 
> >         Bastian Blank perhaps you could point me in the right direction in regards to a debian specific customization or patch I should be aware of?
> >         Maxium transfer rate (to/from hard disk) using the PVOPS 'xen/master' kernel and forward ported xenified kernel (2.6.31.12) is bottlenecking at ~1MB/s. On the
> >         debain lenny xen kernel I am getting ~4.5MB/s.
> > 
> >         I was hoping one could suggest options in the .config that might be modified in order to improve network throughput of a XEN kernel and therefor increase the data
> >         transfer rates over the netowork to and from the Xen host.
> > 
> >         Thanks alot for any help! As always I will be willing to accept any suggestions :)
> > 
> >         -M
> > 
> >     
 		 	   		  
_________________________________________________________________
Check your Hotmail from your phone. 
http://go.microsoft.com/?linkid=9712957

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RE: [Xen-devel] RE: How to: Improve Network Throughput of a XEN kernel?

[Thomas Halinka]

Hi,

Am Mittwoch, den 03.03.2010, 10:44 -0500 schrieb Mike Viau:
> > 
> > On Tue, Mar 02, 2010 at 07:50:59PM -0500, Mike Viau wrote:
> > > >Any 
> just first argument dummy=dummy should on kenel line.
> > > > Read Wiki one more time. It works.
> > > 
> > > I believe you that it does work. I was able to see (XEN) messages
> coming from the hypervisor, but no matter how I changed the option I
> kept getting a kernel fault.
> > > 
> > > I feel like it was time to stop mucking around with getting Ubuntu
> and the grub2 boot loader to work with XEN so I decided to install a
> headless OpenSUSE 11.2 system.
> > > 
> > > The openSUSE distribution supported Xen 3.4.1 tools, and had a
> 2.6.31.12 xenified kernel. On this setup I experience identical
> network performance.
> > > 
> > > ~1MB/s - w/ xen kernel
> > > ~4.5 MB/s - w/ non-xen kernel
> > > 
> > > I use the e1000e kernel module driver for my Ethernet card.
> > > 
> > > Is this typical Dom0 (or Xen Host) network performance with a
> xenified kernel or is just in my two setups that one encounters such a
> network performance hit to the Dom0?
> > >
> > 
> > No, it's not typical.
> > 
> > How are you measuring the performance? In a gigabit network you
> should be able
> > to push around 110 MB/sec.. 4.5 MB/sec sounds really slow.
> 
> 
> I am using Fast Ethernet (100MB). What sort of throughput should I
> expect becasue I also believe ~1MB is too slow, even just to/from the
> Dom0, without any network emulation to the DomUs.

10 - 12 MB/s should be expected....

> 
> I simply used SCP, HTTP, and FTP file transfer protocols on the Xen
> host to another computer on the LAN. 

Please do something like

Start netCat on a "server"

Server: # nc -l 1111 > /dev/null

and start dd+nc on your XEN-Box/Client

Client: # dd if=/dev/zero bs=1M count=10000 | nc $SERVER-IP 1111

This should show up raw network throughput....


> The ~4.5MB/s bottleneck is the hard drive on the other computer so I
> suspect the true bandwidth would be higher, but getting past the
> ~1MB/s roadblock is my major concern.

use /dev/null instead of HDDs

> I have tried two linux distros and both forward ported xenified and
> parvirtualized xen kernel.
> 
> Does the Xen hypervisor have any effect on the network throughput?

No, but the underlying dom0-Kernel could affect the NIC-Performance...
Had some Issues with running Intel 10GB-NICs (ixgbe) on a 2.6.18-Kernel,
while 2.6.27/29 performed nice.

>  Would updating the Intel E1000E kernel module driver affect the
> network throughput?
> 
> 
> -M


hth,

thomas

> 
> 
> > 
> > -- Pasi
> > 
> > > -M
> > > 
> > > --- On Mon, 3/1/10, Mike Viau <viaum@sheridanc.on.ca> wrote:
> > > 
> > > From: Mike Viau <viaum@sheridanc.on.ca>
> > > Subject: RE: [Xen-devel] RE: [Xen-users] How to: Improve Network
> Throughput of a XEN kernel?
> > > To: bderzhavets@yahoo.com
> > > Cc: xen-devel@lists.xensource.com, xen-users@lists.xensource.com
> > > Date: Monday, March 1, 2010, 2:52 PM
> > > 
> > > Why using grub2 vs grub is baffling am not sure....
> > > 
> > > I think I'd prefer to use the kernel command line in grub2 so that
> the options may be changed easier laster on. However I still have been
> having so success with boot
> > > XEN with Ubuntu's grub2 boot loader.
> > > 
> > > Am I correct to conclude CONFIG_CMDLINE_BOL must = N to allow
> GRUB2 to pass kernel options?
> > > [1]http://cateee.net/lkddb/web-lkddb/CMDLINE_BOOL.html
> > > 
> > > I have read through the Wiki page at
> [2]http://wiki.xensource.com/xenwiki/XenCommonProblems. I am running a
> 64-bit Xen Hypervisor.
> > > 
> > > Thus far I have been having no success with using the example
> entry found at
> [3]http://old.nabble.com/Strange-interaction-from-grub2-and-XEN-td26464067.html
> > > 
> > > A question regarding that entry is what would be the root device
> when there are separate /boot and root partitions? I am using the
> partition with the /boot (grub2) as
> > > my 'set root' device right?
> > > 
> > > I am also using the dummy=dummy as the first option on the first
> module line, again as discovered on the wiki.
> > > 
> > > Additionally posted on another thread here in the Xen mailing list
> was:
> > > 
> > > > On 1 March 2010 08:09, Luke Carrier <luke.carrier@xinos.org>
> wrote:
> > > >>
> > > >> Not sure about Debian, but I know Ubuntu isn*t ideal for Xen
> any more
> > > >> because of the presence of GRUB2 * the new boot loader doesn*t
> support
> > > >> passing certain command lines and the current multiboot
> implementation
> > > >> breaks the method Xen uses to load the
> > > Dom0 kernel * you can*t use Ubuntu
> > > >> 9.10 Server with Xen.
> > > 
> > > I am confused now because Boris clearly created a wordpress.com
> weblog in where Ubuntu 9.10 Server was
> > > used with XEN.
> > > 
> > > Lastly, out of curiosity, what (or what kind) of commands cannot
> be passed with GRUB2?
> > > 
> > > ThX!
> > > 
> > > 
> > > -M
> > > 
> > >
> --------------------------------------------------------------------------------------------------------------------------------------------------------------------------
> > > 
> > > Date: Sat, 27 Feb 2010 11:20:31 -0800
> > > From: bderzhavets@yahoo.com
> > > Subject: Re: [Xen-devel] RE: [Xen-users] How to: Improve Network
> Throughput of a XEN kernel?
> > > To: mike.viau@sheridanc.on.ca
> > > CC: xen-devel@lists.xensource.com; xen-users@lists.xensource.com
> > > 
> > > In Xen Wiki is mentioned , that parameters for kernel may be set
> via command line as follows:-
> > >
> ************************************************************************************************************
> > > module (hd1,10)/vmlinuz-2.6.31.8 dummy=dummy root=/dev/sda7 ro
> console=tty0
> > >
> ************************************************************************************************************
> > > # cat /proc/cmdline
> > > 
> > > shows that GRUB2 skips first argument, what causes problem.
> > > 
> > > Compiling built-in CMD_LINE is just an option.
> > > Read all Wiki written by Pasi and you would never be surprised ;)
> > > 
> > > > P.S: What is your feeling on using a recent Ubuntu system with
> > > > grub-legacy as the boot loader? I noticed that Squeeze has
> adopted grub2 > package as well too...
> > > 
> > > I have development Xen 3.4.3 instance on top Ubuntu 9.10 Server
> with GRUB2 ( baremetall) loading any from 3 mentioned bellow kernels
> under Xen 3.4.3
> > > 
> > > 1.) 2.6.32.9 PVOPS
> > > 2.) 2.6.31.6 PVOPS
> > > 3.) 2.6.31.12 xenified
> > > 
> > > with no problems with dummy=dummy as first parameter ( thanks
> Pasi).
> > > It may also may be done via compiling kernels with built-in
> CMD_LINE.
> > > It works fine as well.
> > > 
> > > Boris.
> > > 
> > > --- On Sat, 2/27/10, Mike Viau <viaum@sheridanc.on.ca> wrote:
> > > 
> > > From: Mike Viau <viaum@sheridanc.on.ca>
> > > Subject: [Xen-devel] RE: [Xen-users] How to: Improve Network
> Throughput of a XEN kernel?
> > > To: bderzhavets@yahoo.com
> > > Cc: xen-devel@lists.xensource.com, xen-users@lists.xensource.com
> > > Date: Saturday, February 27, 2010, 12:03 PM
> > > 
> > > Yes, thank you Boris for pointing that out. I found that was
> defiantly true. The 3.2.1 xen hypervisor could only boot the 2.6.26-2
> xen kernel and the xenified
> > > 2.6.31.12.
> > > 
> > > Additionally I found that:
> > > 
> > > Xend does not start when using pv_ops dom0 kernel?
> > > 
> > > In December 2009 pv_ops dom0 kernel modules were renamed to have a
> "xen-" prefix in them, ie. "evtchn.ko" became "xen-evtchn.ko".
> > > 
> > > This makes Xen 3.4.x xend fail to start, because it tried to load
> "evtchn.ko", but that doesn't exist. You need to load "xen-evtchn.ko"
> and then start xend. Fedora 12
> > > xen-3.4.2-2 rpms have this problem fixed.
> > > 
> > > Also make sure you have xenfs mounted to "/proc/xen", that's
> needed aswell.
> > > 
> > > [Source: [4]http://wiki.xensource.com/xenwiki/XenParavirtOps]
> > > 
> > > And it appears the Debian xen-3.4.2-2 debs (in squeeze) have not
> fixed this problem.
> > > 
> > > Lastly I am still doing some reading on the grub2 package and how
> to configure it. It turns out that I have been using grub-legacy (or
> just good old grub) for so long
> > > that configuring the grub2 boot loader is turning out to be my own
> personal kryptonite.
> > > 
> > > 
> > > 
> > > I am still working on getting the hypervisor to load the dom0
> kernel in a Ubuntu system.
> > > 
> > > 
> > > 
> > > I have noticed an example in your wordpress @ [5]Set up Xen
> 3.4.3-rc2 & Libvirt 0.7.0 Dom0 (with 2.6.31.8 xenified aka Suse
> kernel) on top of Ubuntu 9.10 Server
> > > 
> > > 
> > > 
> > > With CONFIG_CMDLINE="root=/dev/sdb11 ro console=tty0"
> > > 
> > > 
> > > 
> > > menuentry "Xen 3.4 / Ubuntu 9.10 kernel 2.6.31.8 xenified" {
> > > insmod ext2
> > > set root=(hd1,10)
> > > multiboot (hd1,10)/xen-3.4.gz
> > > module (hd1,10)/vmlinuz-2.6.31.8
> > > module (hd1,10)/initrd-2.6.31.8.img
> > > }
> > > 
> > > 
> > > 
> > > I am sure you wouldn't of mentioned the CONFIG_CMDLINE kernel
> option is it was not important for using with grub2 right? I have not
> have to compile a kernel with the
> > > command line previous as I was just able to supply the arguments
> on the kernel line of my menu.lst (grub configuration file).
> > > 
> > > P.S: What is your feeling on using a recent Ubuntu system with
> grub-legacy as the boot loader? I noticed that Squeeze has adopted
> grub2 package as well too...
> > > 
> > > 
> > > -M
> > > 
> > >
> ------------------------------------------------------------------------------------------------------------------------------------------------------------------------
> > > 
> > > Date: Sat, 27 Feb 2010 04:32:59 -0800
> > > From: bderzhavets@yahoo.com
> > > Subject: Re: FW: [Xen-users] How to: Improve Network Throughput of
> a XEN kernel?
> > > To: jbeulich@novell.com; mike.viau@sheridanc.on.ca
> > > CC: xen-devel@lists.xensource.com; xen-users@lists.xensource.com
> > > 
> > > You cannot load pvops kernel under xen-hypervisor 3.2.1 ( >=3.4.0
> in general)
> > > 
> > > Boris.
> > > 
> > > --- On Fri, 2/26/10, Mike Viau <viaum@sheridanc.on.ca> wrote:
> > > 
> > > From: Mike Viau <viaum@sheridanc.on.ca>
> > > Subject: FW: [Xen-users] How to: Improve Network Throughput of a
> XEN kernel?
> > > To: bderzhavets@yahoo.com, jbeulich@novell.com
> > > Cc: xen-users@lists.xensource.com, xen-devel@lists.xensource.com
> > > Date: Friday, February 26, 2010, 3:19 PM
> > > 
> > > Hello again,
> > > 
> > > Just a quick update...
> > > 
> > > I was really hoping it was just going to be an issue with the
> kernel .config, however I copied exact configuration from the working
> Debain 2.6.26-2-xen-amd64 kernel
> > > and used a make oldconfig but the end result was the same.
> > > 
> > > After booting the xenified (2.6.31.12) or pvops kernel (2.6.31.6)
> via both xen-hypervisor 3.2.1 or xen-hypervisor 3.4.2 the maximum data
> transfer to/from the Dom0
> > > (Xen host) is ~1MB/s.
> > > 
> > > Next I plan on re-trying my efforts on a Ubuntu system to see if
> same network bottlenecking is present.
> > > 
> > >
> ----------------------------------------------------------------------------------------------------------------------------------------------------------------------
> > > 
> > > Date: Fri, 26 Feb 2010 09:16:59 -0800
> > > From: bderzhavets@yahoo.com
> > > Subject: Re: [Xen-users] How to: Improve Network Throughput of a
> XEN kernel?
> > > To: xen-users@lists.xensource.com; viaum@sheridanc.on.ca
> > > 
> > > Would escalate to xen-devel. 2.6.31.8 (12) aka Suse xenified was
> Jan Beulich stuff.
> > > He might have an answer.
> > > Boris.
> > > 
> > > --- On Fri, 2/26/10, Mike Viau <viaum@sheridanc.on.ca> wrote:
> > > 
> > > From: Mike Viau <viaum@sheridanc.on.ca>
> > > Subject: [Xen-users] How to: Improve Network Throughput of a XEN
> kernel?
> > > To: xen-users@lists.xensource.com
> > > Cc: waldi@debian.org
> > > Date: Friday, February 26, 2010, 12:09 PM
> > > 
> > > Hi there,
> > > 
> > > I am starting a new thread to try and solve a problem I am having
> will slow network throughput to the XEN host (not to a domU).
> > > 
> > > I have confirmed my problem occurs with PVOPS 'xen/master' kernel
> as well using
> > >
> [6]http://pasik.reaktio.net/xen/pv_ops-dom0-debug/config-2.6.31.6-pvops-dom0-xen-master-x86_64 as the .config.
> > > 
> > > It also occurs with a forward ported xenified kernel (2.6.31.12)
> using the attached config-11-xen (.config).
> > > 
> > > However when using the xen kernel found in debain lenny (2.6.26-2)
> for the amd64 architecture I get similiar transfer rates to my Xen
> host as I do on a baremetel
> > > kernel.
> > > 
> > > Bastian Blank perhaps you could point me in the right direction in
> regards to a debian specific customization or patch I should be aware
> of?
> > > Maxium transfer rate (to/from hard disk) using the PVOPS
> 'xen/master' kernel and forward ported xenified kernel (2.6.31.12) is
> bottlenecking at ~1MB/s. On the
> > > debain lenny xen kernel I am getting ~4.5MB/s.
> > > 
> > > I was hoping one could suggest options in the .config that might
> be modified in order to improve network throughput of a XEN kernel and
> therefor increase the data
> > > transfer rates over the netowork to and from the Xen host.
> > > 
> > > Thanks alot for any help! As always I will be willing to accept
> any suggestions :)
> > > 
> > > -M
> > > 
> > > 
> 
> 
> ______________________________________________________________________
> Live connected with Messenger on your phone Learn more.
> _______________________________________________
> Xen-users mailing list
> Xen-users@lists.xensource.com
> http://lists.xensource.com/xen-users

Re: [Xen-devel] RE: How to: Improve Network Throughput of a XEN kernel?

[Pasi Kärkkäinen]

On Wed, Mar 03, 2010 at 10:44:38AM -0500, Mike Viau wrote:
>    >
>    > On Tue, Mar 02, 2010 at 07:50:59PM -0500, Mike Viau wrote:
>    > > >Any just first argument dummy=dummy should on kenel line.
>    > > > Read Wiki one more time. It works.
>    > >
>    > > I believe you that it does work. I was able to see (XEN) messages
>    coming from the hypervisor, but no matter how I changed the option I kept
>    getting a kernel fault.
>    > >
>    > > I feel like it was time to stop mucking around with getting Ubuntu and
>    the grub2 boot loader to work with XEN so I decided to install a headless
>    OpenSUSE 11.2 system.
>    > >
>    > > The openSUSE distribution supported Xen 3.4.1 tools, and had a
>    2.6.31.12 xenified kernel. On this setup I experience identical network
>    performance.
>    > >
>    > > ~1MB/s - w/ xen kernel
>    > > ~4.5 MB/s - w/ non-xen kernel
>    > >
>    > > I use the e1000e kernel module driver for my Ethernet card.
>    > >
>    > > Is this typical Dom0 (or Xen Host) network performance with a xenified
>    kernel or is just in my two setups that one encounters such a network
>    performance hit to the Dom0?
>    > >
>    >
>    > No, it's not typical.
>    >
>    > How are you measuring the performance? In a gigabit network you should
>    be able
>    > to push around 110 MB/sec.. 4.5 MB/sec sounds really slow.
> 
>    I am using Fast Ethernet (100MB). What sort of throughput should I expect
>    becasue I also believe ~1MB is too slow, even just to/from the Dom0,
>    without any network emulation to the DomUs.
>

100 Mbit ethernet can transfer around 11 MB/sec.
 
>    I simply used SCP, HTTP, and FTP file transfer protocols on the Xen host
>    to another computer on the LAN. The ~4.5MB/s bottleneck is the hard drive
>    on the other computer so I suspect the true bandwidth would be higher, but
>    getting past the ~1MB/s roadblock is my major concern.
> 

Try using normal FTP (without encryption), or iperf.

Or wget to /dev/null, like: wget -O /dev/null http://testserver/file

>    I have tried two linux distros and both forward ported xenified and
>    parvirtualized xen kernel.
> 
>    Does the Xen hypervisor have any effect on the network throughput? Would
>    updating the Intel E1000E kernel module driver affect the network
>    throughput?
> 

Shouldn't be big difference, when you measure from dom0.

-- Pasi

>    -M
> 
>    >
>    > -- Pasi
>    >
>    > > -M
>    > >
>    > > --- On Mon, 3/1/10, Mike Viau <viaum@sheridanc.on.ca> wrote:
>    > >
>    > > From: Mike Viau <viaum@sheridanc.on.ca>
>    > > Subject: RE: [Xen-devel] RE: [Xen-users] How to: Improve Network
>    Throughput of a XEN kernel?
>    > > To: bderzhavets@yahoo.com
>    > > Cc: xen-devel@lists.xensource.com, xen-users@lists.xensource.com
>    > > Date: Monday, March 1, 2010, 2:52 PM
>    > >
>    > > Why using grub2 vs grub is baffling am not sure....
>    > >
>    > > I think I'd prefer to use the kernel command line in grub2 so that the
>    options may be changed easier laster on. However I still have been having
>    so success with boot
>    > > XEN with Ubuntu's grub2 boot loader.
>    > >
>    > > Am I correct to conclude CONFIG_CMDLINE_BOL must = N to allow GRUB2 to
>    pass kernel options?
>    > > [1]http://cateee.net/lkddb/web-lkddb/CMDLINE_BOOL.html
>    > >
>    > > I have read through the Wiki page at
>    [2]http://wiki.xensource.com/xenwiki/XenCommonProblems. I am running a
>    64-bit Xen Hypervisor.
>    > >
>    > > Thus far I have been having no success with using the example entry
>    found at
>    [3]http://old.nabble.com/Strange-interaction-from-grub2-and-XEN-td26464067.html
>    > >
>    > > A question regarding that entry is what would be the root device when
>    there are separate /boot and root partitions? I am using the partition
>    with the /boot (grub2) as
>    > > my 'set root' device right?
>    > >
>    > > I am also using the dummy=dummy as the first option on the first
>    module line, again as discovered on the wiki.
>    > >
>    > > Additionally posted on another thread here in the Xen mailing list
>    was:
>    > >
>    > > > On 1 March 2010 08:09, Luke Carrier <luke.carrier@xinos.org> wrote:
>    > > >>
>    > > >> Not sure about Debian, but I know Ubuntu isn*t ideal for Xen any
>    more
>    > > >> because of the presence of GRUB2 * the new boot loader doesn*t
>    support
>    > > >> passing certain command lines and the current multiboot
>    implementation
>    > > >> breaks the method Xen uses to load the
>    > > Dom0 kernel * you can*t use Ubuntu
>    > > >> 9.10 Server with Xen.
>    > >
>    > > I am confused now because Boris clearly created a wordpress.com weblog
>    in where Ubuntu 9.10 Server was
>    > > used with XEN.
>    > >
>    > > Lastly, out of curiosity, what (or what kind) of commands cannot be
>    passed with GRUB2?
>    > >
>    > > ThX!
>    > >
>    > >
>    > > -M
>    > >
>    > >
>    --------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>    > >
>    > > Date: Sat, 27 Feb 2010 11:20:31 -0800
>    > > From: bderzhavets@yahoo.com
>    > > Subject: Re: [Xen-devel] RE: [Xen-users] How to: Improve Network
>    Throughput of a XEN kernel?
>    > > To: mike.viau@sheridanc.on.ca
>    > > CC: xen-devel@lists.xensource.com; xen-users@lists.xensource.com
>    > >
>    > > In Xen Wiki is mentioned , that parameters for kernel may be set via
>    command line as follows:-
>    > >
>    ************************************************************************************************************
>    > > module (hd1,10)/vmlinuz-2.6.31.8 dummy=dummy root=/dev/sda7 ro
>    console=tty0
>    > >
>    ************************************************************************************************************
>    > > # cat /proc/cmdline
>    > >
>    > > shows that GRUB2 skips first argument, what causes problem.
>    > >
>    > > Compiling built-in CMD_LINE is just an option.
>    > > Read all Wiki written by Pasi and you would never be surprised ;)
>    > >
>    > > > P.S: What is your feeling on using a recent Ubuntu system with
>    > > > grub-legacy as the boot loader? I noticed that Squeeze has adopted
>    grub2 > package as well too...
>    > >
>    > > I have development Xen 3.4.3 instance on top Ubuntu 9.10 Server with
>    GRUB2 ( baremetall) loading any from 3 mentioned bellow kernels under Xen
>    3.4.3
>    > >
>    > > 1.) 2.6.32.9 PVOPS
>    > > 2.) 2.6.31.6 PVOPS
>    > > 3.) 2.6.31.12 xenified
>    > >
>    > > with no problems with dummy=dummy as first parameter ( thanks Pasi).
>    > > It may also may be done via compiling kernels with built-in CMD_LINE.
>    > > It works fine as well.
>    > >
>    > > Boris.
>    > >
>    > > --- On Sat, 2/27/10, Mike Viau <viaum@sheridanc.on.ca> wrote:
>    > >
>    > > From: Mike Viau <viaum@sheridanc.on.ca>
>    > > Subject: [Xen-devel] RE: [Xen-users] How to: Improve Network
>    Throughput of a XEN kernel?
>    > > To: bderzhavets@yahoo.com
>    > > Cc: xen-devel@lists.xensource.com, xen-users@lists.xensource.com
>    > > Date: Saturday, February 27, 2010, 12:03 PM
>    > >
>    > > Yes, thank you Boris for pointing that out. I found that was defiantly
>    true. The 3.2.1 xen hypervisor could only boot the 2.6.26-2 xen kernel and
>    the xenified
>    > > 2.6.31.12.
>    > >
>    > > Additionally I found that:
>    > >
>    > > Xend does not start when using pv_ops dom0 kernel?
>    > >
>    > > In December 2009 pv_ops dom0 kernel modules were renamed to have a
>    "xen-" prefix in them, ie. "evtchn.ko" became "xen-evtchn.ko".
>    > >
>    > > This makes Xen 3.4.x xend fail to start, because it tried to load
>    "evtchn.ko", but that doesn't exist. You need to load "xen-evtchn.ko" and
>    then start xend. Fedora 12
>    > > xen-3.4.2-2 rpms have this problem fixed.
>    > >
>    > > Also make sure you have xenfs mounted to "/proc/xen", that's needed
>    aswell.
>    > >
>    > > [Source: [4]http://wiki.xensource.com/xenwiki/XenParavirtOps]
>    > >
>    > > And it appears the Debian xen-3.4.2-2 debs (in squeeze) have not fixed
>    this problem.
>    > >
>    > > Lastly I am still doing some reading on the grub2 package and how to
>    configure it. It turns out that I have been using grub-legacy (or just
>    good old grub) for so long
>    > > that configuring the grub2 boot loader is turning out to be my own
>    personal kryptonite.
>    > >
>    > >
>    > >
>    > > I am still working on getting the hypervisor to load the dom0 kernel
>    in a Ubuntu system.
>    > >
>    > >
>    > >
>    > > I have noticed an example in your wordpress @ [5]Set up Xen 3.4.3-rc2
>    & Libvirt 0.7.0 Dom0 (with 2.6.31.8 xenified aka Suse kernel) on top of
>    Ubuntu 9.10 Server
>    > >
>    > >
>    > >
>    > > With CONFIG_CMDLINE="root=/dev/sdb11 ro console=tty0"
>    > >
>    > >
>    > >
>    > > menuentry "Xen 3.4 / Ubuntu 9.10 kernel 2.6.31.8 xenified" {
>    > > insmod ext2
>    > > set root=(hd1,10)
>    > > multiboot (hd1,10)/xen-3.4.gz
>    > > module (hd1,10)/vmlinuz-2.6.31.8
>    > > module (hd1,10)/initrd-2.6.31.8.img
>    > > }
>    > >
>    > >
>    > >
>    > > I am sure you wouldn't of mentioned the CONFIG_CMDLINE kernel option
>    is it was not important for using with grub2 right? I have not have to
>    compile a kernel with the
>    > > command line previous as I was just able to supply the arguments on
>    the kernel line of my menu.lst (grub configuration file).
>    > >
>    > > P.S: What is your feeling on using a recent Ubuntu system with
>    grub-legacy as the boot loader? I noticed that Squeeze has adopted grub2
>    package as well too...
>    > >
>    > >
>    > > -M
>    > >
>    > >
>    ------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>    > >
>    > > Date: Sat, 27 Feb 2010 04:32:59 -0800
>    > > From: bderzhavets@yahoo.com
>    > > Subject: Re: FW: [Xen-users] How to: Improve Network Throughput of a
>    XEN kernel?
>    > > To: jbeulich@novell.com; mike.viau@sheridanc.on.ca
>    > > CC: xen-devel@lists.xensource.com; xen-users@lists.xensource.com
>    > >
>    > > You cannot load pvops kernel under xen-hypervisor 3.2.1 ( >=3.4.0 in
>    general)
>    > >
>    > > Boris.
>    > >
>    > > --- On Fri, 2/26/10, Mike Viau <viaum@sheridanc.on.ca> wrote:
>    > >
>    > > From: Mike Viau <viaum@sheridanc.on.ca>
>    > > Subject: FW: [Xen-users] How to: Improve Network Throughput of a XEN
>    kernel?
>    > > To: bderzhavets@yahoo.com, jbeulich@novell.com
>    > > Cc: xen-users@lists.xensource.com, xen-devel@lists.xensource.com
>    > > Date: Friday, February 26, 2010, 3:19 PM
>    > >
>    > > Hello again,
>    > >
>    > > Just a quick update...
>    > >
>    > > I was really hoping it was just going to be an issue with the kernel
>    .config, however I copied exact configuration from the working Debain
>    2.6.26-2-xen-amd64 kernel
>    > > and used a make oldconfig but the end result was the same.
>    > >
>    > > After booting the xenified (2.6.31.12) or pvops kernel (2.6.31.6) via
>    both xen-hypervisor 3.2.1 or xen-hypervisor 3.4.2 the maximum data
>    transfer to/from the Dom0
>    > > (Xen host) is ~1MB/s.
>    > >
>    > > Next I plan on re-trying my efforts on a Ubuntu system to see if same
>    network bottlenecking is present.
>    > >
>    > >
>    ----------------------------------------------------------------------------------------------------------------------------------------------------------------------
>    > >
>    > > Date: Fri, 26 Feb 2010 09:16:59 -0800
>    > > From: bderzhavets@yahoo.com
>    > > Subject: Re: [Xen-users] How to: Improve Network Throughput of a XEN
>    kernel?
>    > > To: xen-users@lists.xensource.com; viaum@sheridanc.on.ca
>    > >
>    > > Would escalate to xen-devel. 2.6.31.8 (12) aka Suse xenified was Jan
>    Beulich stuff.
>    > > He might have an answer.
>    > > Boris.
>    > >
>    > > --- On Fri, 2/26/10, Mike Viau <viaum@sheridanc.on.ca> wrote:
>    > >
>    > > From: Mike Viau <viaum@sheridanc.on.ca>
>    > > Subject: [Xen-users] How to: Improve Network Throughput of a XEN
>    kernel?
>    > > To: xen-users@lists.xensource.com
>    > > Cc: waldi@debian.org
>    > > Date: Friday, February 26, 2010, 12:09 PM
>    > >
>    > > Hi there,
>    > >
>    > > I am starting a new thread to try and solve a problem I am having will
>    slow network throughput to the XEN host (not to a domU).
>    > >
>    > > I have confirmed my problem occurs with PVOPS 'xen/master' kernel as
>    well using
>    > >
>    [6]http://pasik.reaktio.net/xen/pv_ops-dom0-debug/config-2.6.31.6-pvops-dom0-xen-master-x86_64
>    as the .config.
>    > >
>    > > It also occurs with a forward ported xenified kernel (2.6.31.12) using
>    the attached config-11-xen (.config).
>    > >
>    > > However when using the xen kernel found in debain lenny (2.6.26-2) for
>    the amd64 architecture I get similiar transfer rates to my Xen host as I
>    do on a baremetel
>    > > kernel.
>    > >
>    > > Bastian Blank perhaps you could point me in the right direction in
>    regards to a debian specific customization or patch I should be aware of?
>    > > Maxium transfer rate (to/from hard disk) using the PVOPS 'xen/master'
>    kernel and forward ported xenified kernel (2.6.31.12) is bottlenecking at
>    ~1MB/s. On the
>    > > debain lenny xen kernel I am getting ~4.5MB/s.
>    > >
>    > > I was hoping one could suggest options in the .config that might be
>    modified in order to improve network throughput of a XEN kernel and
>    therefor increase the data
>    > > transfer rates over the netowork to and from the Xen host.
>    > >
>    > > Thanks alot for any help! As always I will be willing to accept any
>    suggestions :)
>    > >
>    > > -M
>    > >
>    > >
> 
>    --------------------------------------------------------------------------
> 
>    Live connected with Messenger on your phone [1]Learn more.
> 
> References
> 
>    Visible links
>    1. http://go.microsoft.com/?linkid=9712957

RE: [Xen-devel] RE: How to: Improve Network Throughput of a XEN kernel?

[Mike Viau]

[-- Attachment #1.1: Type: text/plain, Size: 16287 bytes --]


>Re: [Xen-users] Error: Device 0 (vif) could notbeconnected. Hotplugscripts not working‏
>From:     Carlos Echevarne (cechevarne@gmail.com)
>Sent:     March 4, 2010 3:36:18 AM
>
>Hola Jose!
>
>Try to comment the line "handle_iptable" of /etc/xen/vif-bridge.
>
>I think that's a problem with iptables.

I did not attempt this, I believe this suggestion was fixing a hotplug issue... but it was in reply to How to: Improve Network Throughput of a XEN kernel?

> Subject: RE: [Xen-devel] RE: [Xen-users] How to: Improve Network Throughput	of a XEN kernel?
> From: lists@thohal.de
> To: viaum@sheridanc.on.ca
> Date: Wed, 3 Mar 2010 19:07:40 +0100
> CC: bderzhavets@yahoo.com; xen-devel@lists.xensource.com; xen-users@lists.xensource.com
> 
> Hi,
> 
> Am Mittwoch, den 03.03.2010, 10:44 -0500 schrieb Mike Viau:
> > > 
> > > On Tue, Mar 02, 2010 at 07:50:59PM -0500, Mike Viau wrote:
> > > > >Any 
> > just first argument dummy=dummy should on kenel line.
> > > > > Read Wiki one more time. It works.
> > > > 
> > > > I believe you that it does work. I was able to see (XEN) messages
> > coming from the hypervisor, but no matter how I changed the option I
> > kept getting a kernel fault.
> > > > 
> > > > I feel like it was time to stop mucking around with getting Ubuntu
> > and the grub2 boot loader to work with XEN so I decided to install a
> > headless OpenSUSE 11.2 system.
> > > > 
> > > > The openSUSE distribution supported Xen 3.4.1 tools, and had a
> > 2.6.31.12 xenified kernel. On this setup I experience identical
> > network performance.
> > > > 
> > > > ~1MB/s - w/ xen kernel
> > > > ~4.5 MB/s - w/ non-xen kernel
> > > > 
> > > > I use the e1000e kernel module driver for my Ethernet card.
> > > > 
> > > > Is this typical Dom0 (or Xen Host) network performance with a
> > xenified kernel or is just in my two setups that one encounters such a
> > network performance hit to the Dom0?
> > > >
> > > 
> > > No, it's not typical.
> > > 
> > > How are you measuring the performance? In a gigabit network you
> > should be able
> > > to push around 110 MB/sec.. 4.5 MB/sec sounds really slow.
> > 
> > 
> > I am using Fast Ethernet (100MB). What sort of throughput should I
> > expect becasue I also believe ~1MB is too slow, even just to/from the
> > Dom0, without any network emulation to the DomUs.
> 
> 10 - 12 MB/s should be expected....
> 
> > 
> > I simply used SCP, HTTP, and FTP file transfer protocols on the Xen
> > host to another computer on the LAN. 
> 
> Please do something like
> 
> Start netCat on a "server"
> 
> Server: # nc -l 1111 > /dev/null
> 
> and start dd+nc on your XEN-Box/Client
> 
> Client: # dd if=/dev/zero bs=1M count=10000 | nc $SERVER-IP 1111
> 
> This should show up raw network throughput....
> 
> 

Yup I was able to get 8MB/s, this time I believe the network equipement is to blame, but this has been a wonderful suggestion, thank you. I'd just like to note the -p option was required to start netcats listening on the specified port number.

> > The ~4.5MB/s bottleneck is the hard drive on the other computer so I
> > suspect the true bandwidth would be higher, but getting past the
> > ~1MB/s roadblock is my major concern.
> 
> use /dev/null instead of HDDs
> 
> > I have tried two linux distros and both forward ported xenified and
> > parvirtualized xen kernel.
> > 
> > Does the Xen hypervisor have any effect on the network throughput?
> 
> No, but the underlying dom0-Kernel could affect the NIC-Performance...
> Had some Issues with running Intel 10GB-NICs (ixgbe) on a 2.6.18-Kernel,
> while 2.6.27/29 performed nice.
> 

This is what I specualt to have been the issue to. After using a stable xenified 2.6.33 kernel my throughput shot up 8 times to the Dom0! Also I noted that between kernel versions 2.6.31 and 2.6.33 the exact same module driver version was used.

filename:       /lib/modules/2.6.33-xen/kernel/drivers/net/e1000e/e1000e.ko
version:        1.0.2-k2

filename:       /lib/modules/2.6.31.12-xen/kernel/drivers/net/e1000e/e1000e.ko
version:        1.0.2-k2



> >  Would updating the Intel E1000E kernel module driver affect the
> > network throughput?

So I guess in this case updating the kernel module driver was not required.

> > 
> > 
> > -M
> 
> 
> hth,
> 
> thomas
> 
> > 
> > 
> > > 
> > > -- Pasi
> > > 
> > > > -M
> > > > 
> > > > --- On Mon, 3/1/10, Mike Viau <viaum@sheridanc.on.ca> wrote:
> > > > 
> > > > From: Mike Viau <viaum@sheridanc.on.ca>
> > > > Subject: RE: [Xen-devel] RE: [Xen-users] How to: Improve Network
> > Throughput of a XEN kernel?
> > > > To: bderzhavets@yahoo.com
> > > > Cc: xen-devel@lists.xensource.com, xen-users@lists.xensource.com
> > > > Date: Monday, March 1, 2010, 2:52 PM
> > > > 
> > > > Why using grub2 vs grub is baffling am not sure....
> > > > 
> > > > I think I'd prefer to use the kernel command line in grub2 so that
> > the options may be changed easier laster on. However I still have been
> > having so success with boot
> > > > XEN with Ubuntu's grub2 boot loader.
> > > > 
> > > > Am I correct to conclude CONFIG_CMDLINE_BOL must = N to allow
> > GRUB2 to pass kernel options?
> > > > [1]http://cateee.net/lkddb/web-lkddb/CMDLINE_BOOL.html
> > > > 
> > > > I have read through the Wiki page at
> > [2]http://wiki.xensource.com/xenwiki/XenCommonProblems. I am running a
> > 64-bit Xen Hypervisor.
> > > > 
> > > > Thus far I have been having no success with using the example
> > entry found at
> > [3]http://old.nabble.com/Strange-interaction-from-grub2-and-XEN-td26464067.html
> > > > 
> > > > A question regarding that entry is what would be the root device
> > when there are separate /boot and root partitions? I am using the
> > partition with the /boot (grub2) as
> > > > my 'set root' device right?
> > > > 
> > > > I am also using the dummy=dummy as the first option on the first
> > module line, again as discovered on the wiki.
> > > > 
> > > > Additionally posted on another thread here in the Xen mailing list
> > was:
> > > > 
> > > > > On 1 March 2010 08:09, Luke Carrier <luke.carrier@xinos.org>
> > wrote:
> > > > >>
> > > > >> Not sure about Debian, but I know Ubuntu isn*t ideal for Xen
> > any more
> > > > >> because of the presence of GRUB2 * the new boot loader doesn*t
> > support
> > > > >> passing certain command lines and the current multiboot
> > implementation
> > > > >> breaks the method Xen uses to load the
> > > > Dom0 kernel * you can*t use Ubuntu
> > > > >> 9.10 Server with Xen.
> > > > 
> > > > I am confused now because Boris clearly created a wordpress.com
> > weblog in where Ubuntu 9.10 Server was
> > > > used with XEN.
> > > > 
> > > > Lastly, out of curiosity, what (or what kind) of commands cannot
> > be passed with GRUB2?
> > > > 
> > > > ThX!
> > > > 
> > > > 
> > > > -M
> > > > 
> > > >
> > --------------------------------------------------------------------------------------------------------------------------------------------------------------------------
> > > > 
> > > > Date: Sat, 27 Feb 2010 11:20:31 -0800
> > > > From: bderzhavets@yahoo.com
> > > > Subject: Re: [Xen-devel] RE: [Xen-users] How to: Improve Network
> > Throughput of a XEN kernel?
> > > > To: mike.viau@sheridanc.on.ca
> > > > CC: xen-devel@lists.xensource.com; xen-users@lists.xensource.com
> > > > 
> > > > In Xen Wiki is mentioned , that parameters for kernel may be set
> > via command line as follows:-
> > > >
> > ************************************************************************************************************
> > > > module (hd1,10)/vmlinuz-2.6.31.8 dummy=dummy root=/dev/sda7 ro
> > console=tty0
> > > >
> > ************************************************************************************************************
> > > > # cat /proc/cmdline
> > > > 
> > > > shows that GRUB2 skips first argument, what causes problem.
> > > > 
> > > > Compiling built-in CMD_LINE is just an option.
> > > > Read all Wiki written by Pasi and you would never be surprised ;)
> > > > 
> > > > > P.S: What is your feeling on using a recent Ubuntu system with
> > > > > grub-legacy as the boot loader? I noticed that Squeeze has
> > adopted grub2 > package as well too...
> > > > 
> > > > I have development Xen 3.4.3 instance on top Ubuntu 9.10 Server
> > with GRUB2 ( baremetall) loading any from 3 mentioned bellow kernels
> > under Xen 3.4.3
> > > > 
> > > > 1.) 2.6.32.9 PVOPS
> > > > 2.) 2.6.31.6 PVOPS
> > > > 3.) 2.6.31.12 xenified
> > > > 
> > > > with no problems with dummy=dummy as first parameter ( thanks
> > Pasi).
> > > > It may also may be done via compiling kernels with built-in
> > CMD_LINE.
> > > > It works fine as well.
> > > > 
> > > > Boris.
> > > > 
> > > > --- On Sat, 2/27/10, Mike Viau <viaum@sheridanc.on.ca> wrote:
> > > > 
> > > > From: Mike Viau <viaum@sheridanc.on.ca>
> > > > Subject: [Xen-devel] RE: [Xen-users] How to: Improve Network
> > Throughput of a XEN kernel?
> > > > To: bderzhavets@yahoo.com
> > > > Cc: xen-devel@lists.xensource.com, xen-users@lists.xensource.com
> > > > Date: Saturday, February 27, 2010, 12:03 PM
> > > > 
> > > > Yes, thank you Boris for pointing that out. I found that was
> > defiantly true. The 3.2.1 xen hypervisor could only boot the 2.6.26-2
> > xen kernel and the xenified
> > > > 2.6.31.12.
> > > > 
> > > > Additionally I found that:
> > > > 
> > > > Xend does not start when using pv_ops dom0 kernel?
> > > > 
> > > > In December 2009 pv_ops dom0 kernel modules were renamed to have a
> > "xen-" prefix in them, ie. "evtchn.ko" became "xen-evtchn.ko".
> > > > 
> > > > This makes Xen 3.4.x xend fail to start, because it tried to load
> > "evtchn.ko", but that doesn't exist. You need to load "xen-evtchn.ko"
> > and then start xend. Fedora 12
> > > > xen-3.4.2-2 rpms have this problem fixed.
> > > > 
> > > > Also make sure you have xenfs mounted to "/proc/xen", that's
> > needed aswell.
> > > > 
> > > > [Source: [4]http://wiki.xensource.com/xenwiki/XenParavirtOps]
> > > > 
> > > > And it appears the Debian xen-3.4.2-2 debs (in squeeze) have not
> > fixed this problem.
> > > > 
> > > > Lastly I am still doing some reading on the grub2 package and how
> > to configure it. It turns out that I have been using grub-legacy (or
> > just good old grub) for so long
> > > > that configuring the grub2 boot loader is turning out to be my own
> > personal kryptonite.
> > > > 
> > > > 
> > > > 
> > > > I am still working on getting the hypervisor to load the dom0
> > kernel in a Ubuntu system.
> > > > 
> > > > 
> > > > 
> > > > I have noticed an example in your wordpress @ [5]Set up Xen
> > 3.4.3-rc2 & Libvirt 0.7.0 Dom0 (with 2.6.31.8 xenified aka Suse
> > kernel) on top of Ubuntu 9.10 Server
> > > > 
> > > > 
> > > > 
> > > > With CONFIG_CMDLINE="root=/dev/sdb11 ro console=tty0"
> > > > 
> > > > 
> > > > 
> > > > menuentry "Xen 3.4 / Ubuntu 9.10 kernel 2.6.31.8 xenified" {
> > > > insmod ext2
> > > > set root=(hd1,10)
> > > > multiboot (hd1,10)/xen-3.4.gz
> > > > module (hd1,10)/vmlinuz-2.6.31.8
> > > > module (hd1,10)/initrd-2.6.31.8.img
> > > > }
> > > > 
> > > > 
> > > > 
> > > > I am sure you wouldn't of mentioned the CONFIG_CMDLINE kernel
> > option is it was not important for using with grub2 right? I have not
> > have to compile a kernel with the
> > > > command line previous as I was just able to supply the arguments
> > on the kernel line of my menu.lst (grub configuration file).
> > > > 
> > > > P.S: What is your feeling on using a recent Ubuntu system with
> > grub-legacy as the boot loader? I noticed that Squeeze has adopted
> > grub2 package as well too...
> > > > 
> > > > 
> > > > -M
> > > > 
> > > >
> > ------------------------------------------------------------------------------------------------------------------------------------------------------------------------
> > > > 
> > > > Date: Sat, 27 Feb 2010 04:32:59 -0800
> > > > From: bderzhavets@yahoo.com
> > > > Subject: Re: FW: [Xen-users] How to: Improve Network Throughput of
> > a XEN kernel?
> > > > To: jbeulich@novell.com; mike.viau@sheridanc.on.ca
> > > > CC: xen-devel@lists.xensource.com; xen-users@lists.xensource.com
> > > > 
> > > > You cannot load pvops kernel under xen-hypervisor 3.2.1 ( >=3.4.0
> > in general)
> > > > 
> > > > Boris.
> > > > 
> > > > --- On Fri, 2/26/10, Mike Viau <viaum@sheridanc.on.ca> wrote:
> > > > 
> > > > From: Mike Viau <viaum@sheridanc.on.ca>
> > > > Subject: FW: [Xen-users] How to: Improve Network Throughput of a
> > XEN kernel?
> > > > To: bderzhavets@yahoo.com, jbeulich@novell.com
> > > > Cc: xen-users@lists.xensource.com, xen-devel@lists.xensource.com
> > > > Date: Friday, February 26, 2010, 3:19 PM
> > > > 
> > > > Hello again,
> > > > 
> > > > Just a quick update...
> > > > 
> > > > I was really hoping it was just going to be an issue with the
> > kernel .config, however I copied exact configuration from the working
> > Debain 2.6.26-2-xen-amd64 kernel
> > > > and used a make oldconfig but the end result was the same.
> > > > 
> > > > After booting the xenified (2.6.31.12) or pvops kernel (2.6.31.6)
> > via both xen-hypervisor 3.2.1 or xen-hypervisor 3.4.2 the maximum data
> > transfer to/from the Dom0
> > > > (Xen host) is ~1MB/s.
> > > > 
> > > > Next I plan on re-trying my efforts on a Ubuntu system to see if
> > same network bottlenecking is present.
> > > > 
> > > >
> > ----------------------------------------------------------------------------------------------------------------------------------------------------------------------
> > > > 
> > > > Date: Fri, 26 Feb 2010 09:16:59 -0800
> > > > From: bderzhavets@yahoo.com
> > > > Subject: Re: [Xen-users] How to: Improve Network Throughput of a
> > XEN kernel?
> > > > To: xen-users@lists.xensource.com; viaum@sheridanc.on.ca
> > > > 
> > > > Would escalate to xen-devel. 2.6.31.8 (12) aka Suse xenified was
> > Jan Beulich stuff.
> > > > He might have an answer.
> > > > Boris.
> > > > 
> > > > --- On Fri, 2/26/10, Mike Viau <viaum@sheridanc.on.ca> wrote:
> > > > 
> > > > From: Mike Viau <viaum@sheridanc.on.ca>
> > > > Subject: [Xen-users] How to: Improve Network Throughput of a XEN
> > kernel?
> > > > To: xen-users@lists.xensource.com
> > > > Cc: waldi@debian.org
> > > > Date: Friday, February 26, 2010, 12:09 PM
> > > > 
> > > > Hi there,
> > > > 
> > > > I am starting a new thread to try and solve a problem I am having
> > will slow network throughput to the XEN host (not to a domU).
> > > > 
> > > > I have confirmed my problem occurs with PVOPS 'xen/master' kernel
> > as well using
> > > >
> > [6]http://pasik.reaktio.net/xen/pv_ops-dom0-debug/config-2.6.31.6-pvops-dom0-xen-master-x86_64 as the .config.
> > > > 
> > > > It also occurs with a forward ported xenified kernel (2.6.31.12)
> > using the attached config-11-xen (.config).
> > > > 
> > > > However when using the xen kernel found in debain lenny (2.6.26-2)
> > for the amd64 architecture I get similiar transfer rates to my Xen
> > host as I do on a baremetel
> > > > kernel.
> > > > 
> > > > Bastian Blank perhaps you could point me in the right direction in
> > regards to a debian specific customization or patch I should be aware
> > of?
> > > > Maxium transfer rate (to/from hard disk) using the PVOPS
> > 'xen/master' kernel and forward ported xenified kernel (2.6.31.12) is
> > bottlenecking at ~1MB/s. On the
> > > > debain lenny xen kernel I am getting ~4.5MB/s.
> > > > 
> > > > I was hoping one could suggest options in the .config that might
> > be modified in order to improve network throughput of a XEN kernel and
> > therefor increase the data
> > > > transfer rates over the netowork to and from the Xen host.
> > > > 
> > > > Thanks alot for any help! As always I will be willing to accept
> > any suggestions :)
> > > > 
> > > > -M

 		 	   		  
_________________________________________________________________
Check your Hotmail from your phone. 
http://go.microsoft.com/?linkid=9712957

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_______________________________________________
Xen-users mailing list
Xen-users@lists.xensource.com
http://lists.xensource.com/xen-users

RE: [Xen-devel] RE: How to: Improve Network Throughput of a XEN kernel?

[Boris Derzhavets]

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> Lastly, out of curiosity, what (or what kind) of commands cannot be passed with GRUB2?

Any just first argument dummy=dummy should on kenel line.
Read Wiki one more time. It works.

Boris.


--- On Mon, 3/1/10, Mike Viau <viaum@sheridanc.on.ca> wrote:

From: Mike Viau <viaum@sheridanc.on.ca>
Subject: RE: [Xen-devel] RE: [Xen-users] How to: Improve Network Throughput of a XEN kernel?
To: bderzhavets@yahoo.com
Cc: xen-devel@lists.xensource.com, xen-users@lists.xensource.com
Date: Monday, March 1, 2010, 2:52 PM




Why using grub2 vs grub is baffling am not sure....

I think I'd prefer to use the kernel command line in grub2 so that the options may be changed easier laster on. However I still have been having so success with boot XEN with Ubuntu's grub2 boot loader.

Am I correct to conclude CONFIG_CMDLINE_BOL must = N to allow GRUB2 to pass kernel options?
http://cateee.net/lkddb/web-lkddb/CMDLINE_BOOL.html

I have read through the Wiki page at http://wiki.xensource.com/xenwiki/XenCommonProblems. I am running a 64-bit Xen Hypervisor.

Thus far I have been having no success with using the example entry found at http://old.nabble.com/Strange-interaction-from-grub2-and-XEN-td26464067.html

A question regarding that entry is what would be the root device when there are separate /boot and root partitions? I am using the partition with the /boot (grub2) as my 'set root' device right?

I am also using the dummy=dummy as the first option on the first module line, again as discovered on the wiki.

Additionally posted on another thread here in the Xen mailing list was:
> On 1 March 2010 08:09, Luke Carrier <luke.carrier@xinos.org> wrote:
>>
>> Not sure about Debian, but I know Ubuntu isn’t ideal for Xen any more
>> because of the presence of GRUB2 – the new boot loader doesn’t support
>> passing certain command lines and the current multiboot implementation
>> breaks the method Xen uses to load the Dom0 kernel – you can’t use Ubuntu
>> 9.10 Server with Xen.

I am confused now because Boris clearly created a wordpress.com weblog in where Ubuntu 9.10 Server was
used with XEN.

Lastly, out of curiosity, what (or what kind) of commands cannot be passed with GRUB2?


ThX!
 

-M




Date: Sat, 27 Feb 2010 11:20:31 -0800
From: bderzhavets@yahoo.com
Subject: Re: [Xen-devel] RE: [Xen-users] How to: Improve Network Throughput of	a XEN kernel?
To: mike.viau@sheridanc.on.ca
CC: xen-devel@lists.xensource.com; xen-users@lists.xensource.com

In Xen Wiki is mentioned , that parameters for kernel may be set via command line as follows:-
************************************************************************************************************
module (hd1,10)/vmlinuz-2.6.31.8  dummy=dummy  root=/dev/sda7 ro console=tty0
************************************************************************************************************
# cat /proc/cmdline

shows that GRUB2 skips first argument, what causes problem.

Compiling built-in CMD_LINE is just an option.
Read all Wiki written by Pasi and  you would never be surprised ;)

> P.S: What is
your feeling on using a recent Ubuntu system with 
> grub-legacy as the boot
loader? I noticed that Squeeze has adopted grub2 > package as well too...

I have development Xen 3.4.3 instance on top Ubuntu 9.10 Server with GRUB2 ( baremetall) loading any from 3 mentioned bellow kernels under Xen 3.4.3

1.)  2.6.32.9 PVOPS
2.)  2.6.31.6 PVOPS
3.)  2.6.31.12 xenified

with no problems with dummy=dummy as first parameter ( thanks Pasi).
It may also may be done via compiling kernels with built-in CMD_LINE.
It works fine as well.

Boris.











--- On Sat, 2/27/10, Mike Viau <viaum@sheridanc.on.ca> wrote:

From: Mike Viau <viaum@sheridanc.on.ca>
Subject: [Xen-devel] RE: [Xen-users] How to: Improve Network Throughput of a XEN kernel?
To: bderzhavets@yahoo.com
Cc: xen-devel@lists.xensource.com,
 xen-users@lists.xensource.com
Date: Saturday, February 27, 2010, 12:03 PM




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Yes,
thank you Boris for pointing that out. I found that was defiantly true. The 3.2.1 xen
hypervisor could only boot the 2.6.26-2 xen kernel and the xenified 2.6.31.12.



Additionally I found that:



 

Xend does
not start when using pv_ops dom0 kernel? 

In
December 2009 pv_ops dom0 kernel modules were renamed to have a
"xen-" prefix in them, ie. "evtchn.ko" became
"xen-evtchn.ko".  

This
makes Xen 3.4.x xend fail to start, because it tried to load
"evtchn.ko", but that doesn't exist. You need to load
"xen-evtchn.ko" and then start xend. Fedora 12 xen-3.4.2-2 rpms have
this problem fixed.  

Also make
sure you have xenfs mounted to "/proc/xen", that's needed aswell. 



[Source: http://wiki.xensource.com/xenwiki/XenParavirtOps]



And it appears the Debian xen-3.4.2-2 debs (in squeeze) have not fixed
this problem.



Lastly I am still doing some reading on the grub2 package and how to configure it. It turns out
that I have been using grub-legacy (or just good old grub) for so long that
configuring the grub2 boot loader is turning out to be my own personal
kryptonite. 

   

I am
still working on getting the hypervisor to load the dom0 kernel in a Ubuntu system. 

   

I have
noticed an example in your wordpress @ Set up Xen 3.4.3-rc2 & Libvirt 0.7.0 Dom0 (with 2.6.31.8
xenified aka Suse kernel) on top of Ubuntu 9.10 Server 

   

With
CONFIG_CMDLINE="root=/dev/sdb11 ro console=tty0" 

   

menuentry "Xen 3.4 / Ubuntu 9.10 kernel 2.6.31.8 xenified" {

insmod ext2

set root=(hd1,10)

multiboot (hd1,10)/xen-3.4.gz

module (hd1,10)/vmlinuz-2.6.31.8

module (hd1,10)/initrd-2.6.31.8.img

} 

   

I am sure
you wouldn't of mentioned the CONFIG_CMDLINE kernel option is it was not
important for using with grub2 right? I have not have to compile a kernel with the command line previous as I was just able to supply the arguments on the kernel line of my menu.lst (grub configuration file). 


 

P.S: What is
your feeling on using a recent Ubuntu system with grub-legacy as the boot
loader? I noticed that Squeeze has adopted grub2 package as well too... 


 



-M




Date: Sat, 27 Feb 2010 04:32:59 -0800
From: bderzhavets@yahoo.com
Subject: Re: FW: [Xen-users] How to: Improve Network Throughput of a XEN	kernel?
To: jbeulich@novell.com; mike.viau@sheridanc.on.ca
CC: xen-devel@lists.xensource.com; xen-users@lists.xensource.com

You cannot load pvops kernel under xen-hypervisor 3.2.1  ( >=3.4.0 in general)

Boris.

--- On Fri, 2/26/10, Mike Viau <viaum@sheridanc.on.ca> wrote:

From: Mike Viau <viaum@sheridanc.on.ca>
Subject: FW: [Xen-users] How to: Improve Network Throughput of a XEN
 kernel?
To: bderzhavets@yahoo.com, jbeulich@novell.com
Cc: xen-users@lists.xensource.com, xen-devel@lists.xensource.com
Date: Friday, February 26, 2010, 3:19 PM




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Hello again,

Just a quick update...

I was really hoping it was just going to be an issue with the kernel .config, however I copied exact configuration from the working Debain 2.6.26-2-xen-amd64 kernel and used a make oldconfig but the end result was the same.

After booting the xenified (2.6.31.12) or pvops kernel (2.6.31.6) via both xen-hypervisor 3.2.1 or xen-hypervisor 3.4.2 the maximum data transfer to/from the Dom0 (Xen host) is ~1MB/s.

Next I plan on re-trying my efforts on a Ubuntu system to see if same network bottlenecking is present.
 		 	   		  


Date: Fri, 26 Feb 2010 09:16:59 -0800
From: bderzhavets@yahoo.com
Subject: Re: [Xen-users] How to: Improve Network Throughput of a XEN kernel?
To: xen-users@lists.xensource.com; viaum@sheridanc.on.ca

Would escalate to xen-devel.  2.6.31.8 (12) aka Suse xenified  was Jan Beulich stuff.
He might have an answer.
Boris.

--- On Fri, 2/26/10, Mike Viau <viaum@sheridanc.on.ca> wrote:

From: Mike Viau <viaum@sheridanc.on.ca>
Subject: [Xen-users] How to: Improve Network Throughput of a XEN kernel?
To: xen-users@lists.xensource.com
Cc: waldi@debian.org
Date: Friday, February 26, 2010, 12:09 PM




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Hi there,

I am starting a new thread to try and solve a problem I am having will slow network throughput to the XEN host (not to a domU).

I have confirmed my problem occurs with PVOPS  'xen/master' kernel as well using http://pasik.reaktio.net/xen/pv_ops-dom0-debug/config-2.6.31.6-pvops-dom0-xen-master-x86_64 as the .config.

It also occurs with a forward ported xenified kernel (2.6.31.12) using the attached config-11-xen (.config).

However when using the xen kernel found in debain lenny (2.6.26-2) for the amd64 architecture I get similiar transfer rates to my Xen host as I do on a baremetel kernel.

Bastian Blank perhaps you could point me in the right direction in regards to a debian specific customization or patch I should be aware of?

Maxium transfer rate (to/from
 hard disk) using the PVOPS  'xen/master' kernel and forward ported xenified kernel (2.6.31.12) is bottlenecking at ~1MB/s. On the debain lenny xen kernel I am getting ~4.5MB/s.

I was
hoping one could suggest options in the .config that might be modified
in order to improve network throughput of a XEN kernel and therefor increase the data transfer rates over the netowork to and from the Xen host.

Thanks alot for any help! As always I will be willing to accept any suggestions :)


-M

 		 	   		  
 		 	   		  
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Re: [Xen-devel] RE: How to: Improve Network Throughput of a XEN kernel?

[Boris Derzhavets]

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In Xen Wiki is mentioned , that parameters for kernel may be set via command line as follows:-
************************************************************************************************************
module (hd1,10)/vmlinuz-2.6.31.8  dummy=dummy  root=/dev/sda7 ro console=tty0
************************************************************************************************************
# cat /proc/cmdline

shows that GRUB2 skips first argument, what causes problem.

Compiling built-in CMD_LINE is just an option.
Read all Wiki written by Pasi and  you would never be surprised ;)

> P.S: What is
your feeling on using a recent Ubuntu system with 
> grub-legacy as the boot
loader? I noticed that Squeeze has adopted grub2 > package as well too...

I have development Xen 3.4.3 instance on top Ubuntu 9.10 Server with GRUB2 ( baremetall) loading any from 3 mentioned bellow kernels under Xen 3.4.3

1.)  2.6.32.9 PVOPS
2.)  2.6.31.6 PVOPS
3.)  2.6.31.12 xenified

with no problems with dummy=dummy as first parameter ( thanks Pasi).
It may also may be done via compiling kernels with built-in CMD_LINE.
It works fine as well.

Boris.











--- On Sat, 2/27/10, Mike Viau <viaum@sheridanc.on.ca> wrote:

From: Mike Viau <viaum@sheridanc.on.ca>
Subject: [Xen-devel] RE: [Xen-users] How to: Improve Network Throughput of a XEN kernel?
To: bderzhavets@yahoo.com
Cc: xen-devel@lists.xensource.com, xen-users@lists.xensource.com
Date: Saturday, February 27, 2010, 12:03 PM










Yes,
thank you Boris for pointing that out. I found that was defiantly true. The 3.2.1 xen
hypervisor could only boot the 2.6.26-2 xen kernel and the xenified 2.6.31.12.



Additionally I found that:



 

Xend does
not start when using pv_ops dom0 kernel? 

In
December 2009 pv_ops dom0 kernel modules were renamed to have a
"xen-" prefix in them, ie. "evtchn.ko" became
"xen-evtchn.ko".  

This
makes Xen 3.4.x xend fail to start, because it tried to load
"evtchn.ko", but that doesn't exist. You need to load
"xen-evtchn.ko" and then start xend. Fedora 12 xen-3.4.2-2 rpms have
this problem fixed.  

Also make
sure you have xenfs mounted to "/proc/xen", that's needed aswell. 



[Source: http://wiki.xensource.com/xenwiki/XenParavirtOps]



And it appears the Debian xen-3.4.2-2 debs (in squeeze) have not fixed
this problem.



Lastly I am still doing some reading on the grub2 package and how to configure it. It turns out
that I have been using grub-legacy (or just good old grub) for so long that
configuring the grub2 boot loader is turning out to be my own personal
kryptonite. 

   

I am
still working on getting the hypervisor to load the dom0 kernel in a Ubuntu system. 

   

I have
noticed an example in your wordpress @ Set up Xen 3.4.3-rc2 & Libvirt 0.7.0 Dom0 (with 2.6.31.8
xenified aka Suse kernel) on top of Ubuntu 9.10 Server 

   

With
CONFIG_CMDLINE="root=/dev/sdb11 ro console=tty0" 

   

menuentry "Xen 3.4 / Ubuntu 9.10 kernel 2.6.31.8 xenified" {

insmod ext2

set root=(hd1,10)

multiboot (hd1,10)/xen-3.4.gz

module (hd1,10)/vmlinuz-2.6.31.8

module (hd1,10)/initrd-2.6.31.8.img

} 

   

I am sure
you wouldn't of mentioned the CONFIG_CMDLINE kernel option is it was not
important for using with grub2 right? I have not have to compile a kernel with the command line previous as I was just able to supply the arguments on the kernel line of my menu.lst (grub configuration file). 


 

P.S: What is
your feeling on using a recent Ubuntu system with grub-legacy as the boot
loader? I noticed that Squeeze has adopted grub2 package as well too... 


 



-M




Date: Sat, 27 Feb 2010 04:32:59 -0800
From: bderzhavets@yahoo.com
Subject: Re: FW: [Xen-users] How to: Improve Network Throughput of a XEN	kernel?
To: jbeulich@novell.com; mike.viau@sheridanc.on.ca
CC: xen-devel@lists.xensource.com; xen-users@lists.xensource.com

You cannot load pvops kernel under xen-hypervisor 3.2.1  ( >=3.4.0 in general)

Boris.

--- On Fri, 2/26/10, Mike Viau <viaum@sheridanc.on.ca> wrote:

From: Mike Viau <viaum@sheridanc.on.ca>
Subject: FW: [Xen-users] How to: Improve Network Throughput of a XEN kernel?
To: bderzhavets@yahoo.com, jbeulich@novell.com
Cc: xen-users@lists.xensource.com, xen-devel@lists.xensource.com
Date: Friday, February 26, 2010, 3:19 PM




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Hello again,

Just a quick update...

I was really hoping it was just going to be an issue with the kernel .config, however I copied exact configuration from the working Debain 2.6.26-2-xen-amd64 kernel and used a make oldconfig but the end result was the same.

After booting the xenified (2.6.31.12) or pvops kernel (2.6.31.6) via both xen-hypervisor 3.2.1 or xen-hypervisor 3.4.2 the maximum data transfer to/from the Dom0 (Xen host) is ~1MB/s.

Next I plan on re-trying my efforts on a Ubuntu system to see if same network bottlenecking is present.
 		 	   		  


Date: Fri, 26 Feb 2010 09:16:59 -0800
From: bderzhavets@yahoo.com
Subject: Re: [Xen-users] How to: Improve Network Throughput of a XEN kernel?
To: xen-users@lists.xensource.com; viaum@sheridanc.on.ca

Would escalate to xen-devel.  2.6.31.8 (12) aka Suse xenified  was Jan Beulich stuff.
He might have an answer.
Boris.

--- On Fri, 2/26/10, Mike Viau <viaum@sheridanc.on.ca> wrote:

From: Mike Viau <viaum@sheridanc.on.ca>
Subject: [Xen-users] How to: Improve Network Throughput of a XEN kernel?
To: xen-users@lists.xensource.com
Cc: waldi@debian.org
Date: Friday, February 26, 2010, 12:09 PM




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Hi there,

I am starting a new thread to try and solve a problem I am having will slow network throughput to the XEN host (not to a domU).

I have confirmed my problem occurs with PVOPS  'xen/master' kernel as well using http://pasik.reaktio.net/xen/pv_ops-dom0-debug/config-2.6.31.6-pvops-dom0-xen-master-x86_64 as the .config.

It also occurs with a forward ported xenified kernel (2.6.31.12) using the attached config-11-xen (.config).

However when using the xen kernel found in debain lenny (2.6.26-2) for the amd64 architecture I get similiar transfer rates to my Xen host as I do on a baremetel kernel.

Bastian Blank perhaps you could point me in the right direction in regards to a debian specific customization or patch I should be aware of?

Maxium transfer rate (to/from
 hard disk) using the PVOPS  'xen/master' kernel and forward ported xenified kernel (2.6.31.12) is bottlenecking at ~1MB/s. On the debain lenny xen kernel I am getting ~4.5MB/s.

I was
hoping one could suggest options in the .config that might be modified
in order to improve network throughput of a XEN kernel and therefor increase the data transfer rates over the netowork to and from the Xen host.

Thanks alot for any help! As always I will be willing to accept any suggestions :)


-M

 		 	   		  
 		 	   		  
Not using Hotmail on your phone? Why not? Get it now. 

 		 	   		  
Live connected with Hotmail on your phone. Learn more. 

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