* Question about VirtIO on Xen - Disk performance issues
@ 2015-12-15 13:09 Luca Tongiani
2015-12-15 15:34 ` Ian Campbell
2015-12-16 11:31 ` Stefano Stabellini
0 siblings, 2 replies; 12+ messages in thread
From: Luca Tongiani @ 2015-12-15 13:09 UTC (permalink / raw)
To: xen-devel
[-- Attachment #1.1: Type: text/plain, Size: 739 bytes --]
Hi to all,
I'm writing you this mail for asking some advice about a great problem
i'm havin in running a Windows VM (HVM) onto a Xen (Gentoo based) Hypevisor.
I need to achieve maximum performance from this VM because of intense
SQL tasks running in it.
I've seen good improvement in IO on disk using VirtIO on a Windows VM
onto a QEMU (QNAP) hypervisor, and i'm tryin to use this feature also on
my Xen HV.
Is VirtIO disk a good way to improve performance?
Thx in advance and hope to keep in touch
--
*Luca Tongiani*
*Sinte* srl
Soluzioni Informatiche e Telematiche
via Monte Grappa 4/B
20900 Monza (MB)
*Cel* (+39) 339 745 49 21
*Tel* (+39) 039 200 59 60
*Fax* (+39) 039 200 69 42
*Web* www.sinte.net <http://www.sinte.net/>
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_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xen.org
http://lists.xen.org/xen-devel
^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: Question about VirtIO on Xen - Disk performance issues
2015-12-15 13:09 Question about VirtIO on Xen - Disk performance issues Luca Tongiani
@ 2015-12-15 15:34 ` Ian Campbell
2015-12-16 11:31 ` Stefano Stabellini
1 sibling, 0 replies; 12+ messages in thread
From: Ian Campbell @ 2015-12-15 15:34 UTC (permalink / raw)
To: Luca Tongiani, xen-users
On Tue, 2015-12-15 at 14:09 +0100, Luca Tongiani wrote:
> Hi to all,
> I'm writing you this mail for asking some advice about a great problem
This sort of question is on topic for xen-users@, but since it is not a
development question not for xen-devel@. I've moved the To line over and am
bccing the dev list.
Also please do not post HTML.
> i'm havin in running a Windows VM (HVM) onto a Xen (Gentoo based)
> Hypevisor.
>
> I need to achieve maximum performance from this VM because of intense SQL
> tasks running in it.
>
> I've seen good improvement in IO on disk using VirtIO on a Windows VM
> onto a QEMU (QNAP) hypervisor, and i'm tryin to use this feature also on
> my Xen HV.
> Is VirtIO disk a good way to improve performance?
Please see http://www.xenproject.org/developers/teams/windows-pv-drivers.ht
ml for Xen PV drivers for Windows, which is Xen's equivalent to virtio.
Ian.
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http://lists.xen.org/xen-devel
^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: Question about VirtIO on Xen - Disk performance issues
2015-12-15 13:09 Question about VirtIO on Xen - Disk performance issues Luca Tongiani
2015-12-15 15:34 ` Ian Campbell
@ 2015-12-16 11:31 ` Stefano Stabellini
2016-01-05 10:53 ` Luca Tongiani
1 sibling, 1 reply; 12+ messages in thread
From: Stefano Stabellini @ 2015-12-16 11:31 UTC (permalink / raw)
To: Luca Tongiani; +Cc: xen-devel
Hello Luca,
the recommended way to increase disk performance would be to use Xen PV
disks. You just need to install the Windows PV drivers:
http://www.xenproject.org/developers/teams/windows-pv-drivers.html
But using VirtIO disk should also increase performance, even though
most probably not as much.
Cheers,
Stefano
On Tue, 15 Dec 2015, Luca Tongiani wrote:
> Hi to all,
> I'm writing you this mail for asking some advice about a great problem i'm havin in running a Windows VM
> (HVM) onto a Xen (Gentoo based) Hypevisor.
>
> I need to achieve maximum performance from this VM because of intense SQL tasks running in it.
>
> I've seen good improvement in IO on disk using VirtIO on a Windows VM onto a QEMU (QNAP) hypervisor, and i'm
> tryin to use this feature also on my Xen HV.
> Is VirtIO disk a good way to improve performance?
>
> Thx in advance and hope to keep in touch
> --
>
> Luca Tongiani
>
> Sinte srl
> Soluzioni Informatiche e Telematiche
> via Monte Grappa 4/B
> 20900 Monza (MB)
>
> Cel (+39) 339 745 49 21
> Tel (+39) 039 200 59 60
> Fax (+39) 039 200 69 42
> Web www.sinte.net
>
>
>
^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: Question about VirtIO on Xen - Disk performance issues
2015-12-16 11:31 ` Stefano Stabellini
@ 2016-01-05 10:53 ` Luca Tongiani
2016-01-05 11:09 ` Stefano Stabellini
0 siblings, 1 reply; 12+ messages in thread
From: Luca Tongiani @ 2016-01-05 10:53 UTC (permalink / raw)
To: Stefano Stabellini; +Cc: xen-devel
[-- Attachment #1.1: Type: text/plain, Size: 1714 bytes --]
Hi Stefano,
im writing to you because im having issue with I/O disk in my DomU With
Xen (Gentoo based system).
I tried to use the driver that you provided for the PV .
But the results are still not good , there is no way to support the use
of Xen VirtIO disk ? Many thanks in advance
Luca
Il 12/16/15 12:31, Stefano Stabellini ha scritto:
> Hello Luca,
>
> the recommended way to increase disk performance would be to use Xen PV
> disks. You just need to install the Windows PV drivers:
>
> http://www.xenproject.org/developers/teams/windows-pv-drivers.html
>
> But using VirtIO disk should also increase performance, even though
> most probably not as much.
>
> Cheers,
>
> Stefano
>
> On Tue, 15 Dec 2015, Luca Tongiani wrote:
>> Hi to all,
>> I'm writing you this mail for asking some advice about a great problem i'm havin in running a Windows VM
>> (HVM) onto a Xen (Gentoo based) Hypevisor.
>>
>> I need to achieve maximum performance from this VM because of intense SQL tasks running in it.
>>
>> I've seen good improvement in IO on disk using VirtIO on a Windows VM onto a QEMU (QNAP) hypervisor, and i'm
>> tryin to use this feature also on my Xen HV.
>> Is VirtIO disk a good way to improve performance?
>>
>> Thx in advance and hope to keep in touch
>> --
>>
>> Luca Tongiani
>>
>> Sinte srl
>> Soluzioni Informatiche e Telematiche
>> via Monte Grappa 4/B
>> 20900 Monza (MB)
>>
>> Cel (+39) 339 745 49 21
>> Tel (+39) 039 200 59 60
>> Fax (+39) 039 200 69 42
>> Web www.sinte.net
>>
>>
>>
--
*Luca Tongiani*
*Sinte* srl
Soluzioni Informatiche e Telematiche
via Monte Grappa 4/B
20900 Monza (MB)
*Tel* (+39) 039 200 59 60
*Fax* (+39) 039 200 69 42
*Web* www.sinte.net <http://www.sinte.net/>
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_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xen.org
http://lists.xen.org/xen-devel
^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: Question about VirtIO on Xen - Disk performance issues
2016-01-05 10:53 ` Luca Tongiani
@ 2016-01-05 11:09 ` Stefano Stabellini
2016-01-05 12:22 ` Luca Tongiani
0 siblings, 1 reply; 12+ messages in thread
From: Stefano Stabellini @ 2016-01-05 11:09 UTC (permalink / raw)
To: Luca Tongiani; +Cc: xen-devel, Stefano Stabellini
Could you please post your VM config file and the output of
xenstore-ls once the VM has completed the boot sequence?
On Tue, 5 Jan 2016, Luca Tongiani wrote:
> Hi Stefano,
> im writing to you because im having issue with I/O disk in my DomU With Xen (Gentoo based system).
>
> I tried to use the driver that you provided for the PV .
> But the results are still not good , there is no way to support the use of Xen VirtIO disk ? Many thanks in
> advance
>
> Luca
>
> Il 12/16/15 12:31, Stefano Stabellini ha scritto:
>
> Hello Luca,
>
> the recommended way to increase disk performance would be to use Xen PV
> disks. You just need to install the Windows PV drivers:
>
> http://www.xenproject.org/developers/teams/windows-pv-drivers.html
>
> But using VirtIO disk should also increase performance, even though
> most probably not as much.
>
> Cheers,
>
> Stefano
>
> On Tue, 15 Dec 2015, Luca Tongiani wrote:
>
> Hi to all,
> I'm writing you this mail for asking some advice about a great problem i'm havin in running a Windows VM
> (HVM) onto a Xen (Gentoo based) Hypevisor.
>
> I need to achieve maximum performance from this VM because of intense SQL tasks running in it.
>
> I've seen good improvement in IO on disk using VirtIO on a Windows VM onto a QEMU (QNAP) hypervisor, and i'm
> tryin to use this feature also on my Xen HV.
> Is VirtIO disk a good way to improve performance?
>
> Thx in advance and hope to keep in touch
> --
>
> Luca Tongiani
>
> Sinte srl
> Soluzioni Informatiche e Telematiche
> via Monte Grappa 4/B
> 20900 Monza (MB)
>
> Cel (+39) 339 745 49 21
> Tel (+39) 039 200 59 60
> Fax (+39) 039 200 69 42
> Web www.sinte.net
>
>
>
>
> --
>
> Luca Tongiani
>
> Sinte srl
> Soluzioni Informatiche e Telematiche
> via Monte Grappa 4/B
> 20900 Monza (MB)
>
> Tel (+39) 039 200 59 60
> Fax (+39) 039 200 69 42
> Web www.sinte.net
>
>
>
^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: Question about VirtIO on Xen - Disk performance issues
2016-01-05 11:09 ` Stefano Stabellini
@ 2016-01-05 12:22 ` Luca Tongiani
2016-01-05 12:42 ` Stefano Stabellini
0 siblings, 1 reply; 12+ messages in thread
From: Luca Tongiani @ 2016-01-05 12:22 UTC (permalink / raw)
To: Stefano Stabellini; +Cc: xen-devel
[-- Attachment #1.1: Type: text/plain, Size: 2537 bytes --]
Hi,
thanks in advance for your reply :)
I have attached the following email configuration DomU and the output
you have requested .
Performance disk are all my machines the most serious problem , even if
they are used powerful hardware .
Differences in Disk writing in DomU are 1/3 of those of the Dom0 .
Thank you in advance Luca
Il 05/01/2016 12:09, Stefano Stabellini ha scritto:
> Could you please post your VM config file and the output of
> xenstore-ls once the VM has completed the boot sequence?
>
> On Tue, 5 Jan 2016, Luca Tongiani wrote:
>> Hi Stefano,
>> im writing to you because im having issue with I/O disk in my DomU With Xen (Gentoo based system).
>>
>> I tried to use the driver that you provided for the PV .
>> But the results are still not good , there is no way to support the use of Xen VirtIO disk ? Many thanks in
>> advance
>>
>> Luca
>>
>> Il 12/16/15 12:31, Stefano Stabellini ha scritto:
>>
>> Hello Luca,
>>
>> the recommended way to increase disk performance would be to use Xen PV
>> disks. You just need to install the Windows PV drivers:
>>
>> http://www.xenproject.org/developers/teams/windows-pv-drivers.html
>>
>> But using VirtIO disk should also increase performance, even though
>> most probably not as much.
>>
>> Cheers,
>>
>> Stefano
>>
>> On Tue, 15 Dec 2015, Luca Tongiani wrote:
>>
>> Hi to all,
>> I'm writing you this mail for asking some advice about a great problem i'm havin in running a Windows VM
>> (HVM) onto a Xen (Gentoo based) Hypevisor.
>>
>> I need to achieve maximum performance from this VM because of intense SQL tasks running in it.
>>
>> I've seen good improvement in IO on disk using VirtIO on a Windows VM onto a QEMU (QNAP) hypervisor, and i'm
>> tryin to use this feature also on my Xen HV.
>> Is VirtIO disk a good way to improve performance?
>>
>> Thx in advance and hope to keep in touch
>> --
>>
>> Luca Tongiani
>>
>> Sinte srl
>> Soluzioni Informatiche e Telematiche
>> via Monte Grappa 4/B
>> 20900 Monza (MB)
>>
>> Cel (+39) 339 745 49 21
>> Tel (+39) 039 200 59 60
>> Fax (+39) 039 200 69 42
>> Web www.sinte.net
>>
>>
>>
>>
>> --
>>
>> Luca Tongiani
>>
>> Sinte srl
>> Soluzioni Informatiche e Telematiche
>> via Monte Grappa 4/B
>> 20900 Monza (MB)
>>
>> Tel (+39) 039 200 59 60
>> Fax (+39) 039 200 69 42
>> Web www.sinte.net
>>
>>
>>
--
*Luca Tongiani*
*Sinte* srl
Soluzioni Informatiche e Telematiche
via Monte Grappa 4/B
20900 Monza (MB)
*Tel* (+39) 039 200 59 60
*Fax* (+39) 039 200 69 42
*Web* www.sinte.net <http://www.sinte.net/>
[-- Attachment #1.2: Type: text/html, Size: 4051 bytes --]
[-- Attachment #2: xenstore-ls_output_backupvm --]
[-- Type: text/plain, Size: 2044 bytes --]
00000000-0000-0000-0000-000000000000-25 = ""
on_xend_stop = "ignore"
pool_name = "Pool-0"
shadow_memory = "0"
uuid = "00000000-0000-0000-0000-000000000000"
on_reboot = "restart"
image = "(linux (kernel '') (superpages 0) (nomigrate 0) (tsc_mode 0))"
ostype = "linux"
kernel = ""
cmdline = ""
ramdisk = ""
on_poweroff = "destroy"
bootloader_args = ""
on_xend_start = "ignore"
on_crash = "restart"
xend = ""
restart_count = "0"
vcpus = "2"
vcpu_avail = "3"
bootloader = ""
name = "Domain-0"
6d2e6572-6316-8527-1bc3-7a32b7fdd35f = ""
image = "(linux (kernel /var/xen/boot/vmlinuz-2.6.38-gentoo-r6) (args 'roo\..."
ostype = "linux"
kernel = "/var/xen/boot/vmlinuz-2.6.38-gentoo-r6"
cmdline = "root=/dev/xvda1 xencons=hvc0"
ramdisk = ""
device = ""
tap = ""
51713 = ""
frontend = "/local/domain/5/device/vbd/51713"
frontend-id = "5"
backend-id = "0"
backend = "/local/domain/0/backend/tap/5/51713"
51715 = ""
frontend = "/local/domain/5/device/vbd/51715"
frontend-id = "5"
backend-id = "0"
backend = "/local/domain/0/backend/tap/5/51715"
vbd = ""
51714 = ""
frontend = "/local/domain/5/device/vbd/51714"
frontend-id = "5"
backend-id = "0"
backend = "/local/domain/0/backend/vbd/5/51714"
vif = ""
0 = ""
frontend = "/local/domain/5/device/vif/0"
frontend-id = "5"
backend-id = "0"
backend = "/local/domain/0/backend/vif/5/0"
console = ""
0 = ""
frontend = "/local/domain/5/device/console/0"
frontend-id = "5"
backend-id = "0"
backend = "/local/domain/0/backend/console/5/0"
on_xend_stop = "ignore"
pool_name = "Pool-0"
shadow_memory = "0"
uuid = "6d2e6572-6316-8527-1bc3-7a32b7fdd35f"
on_reboot = "restart"
start_time = "1343314858.24"
on_poweroff = "destroy"
bootloader_args = ""
on_xend_start = "ignore"
on_crash = "restart"
xend = ""
restart_count = "0"
vcpus = "1"
vcpu_avail = "1"
bootloader = ""
name = "bmsbackup"
[-- Attachment #3: conf_DomU_Xen --]
[-- Type: text/plain, Size: 8379 bytes --]
# -*- mode: python; -*-
#============================================================================
# Python configuration setup for 'xm create'.
# This script sets the parameters used when a domain is created using 'xm create'.
# You use a separate script for each domain you want to create, or
# you can set the parameters for the domain on the xm command line.
#============================================================================
#----------------------------------------------------------------------------
# Kernel image file.
#kernel = "/var/xen/boot/vmlinuz-2.6.32-gentoo-r7"
#kernel = "/var/xen/boot/vmlinuz-2.6.34-xen"
#kernel = "/var/xen/boot/vmlinuz-2.6.38-gentoo-r6"
kernel = "/var/xen/boot/vmlinuz-4.0.5-gentoo_bmsbackup"
# Optional ramdisk.
#ramdisk = "/boot/initrd.gz"
# The domain build function. Default is 'linux'.
#builder='linux'
# Initial memory allocation (in megabytes) for the new domain.
#
# WARNING: Creating a domain with insufficient memory may cause out of
# memory errors. The domain needs enough memory to boot kernel
# and modules. Allocating less than 32MBs is not recommended.
memory = 2048
# A name for your domain. All domains must have different names.
name = "bmsbackup"
# 128-bit UUID for the domain. The default behavior is to generate a new UUID
# on each call to 'xm create'.
#uuid = "06ed00fe-1162-4fc4-b5d8-11993ee4a8b9"
# List of which CPUS this domain is allowed to use, default Xen picks
#cpus = "" # leave to Xen to pick
#cpus = "0" # all vcpus run on CPU0
#cpus = "0-3,5,^1" # all vcpus run on cpus 0,2,3,5
#cpus = ["2", "3"] # VCPU0 runs on CPU2, VCPU1 runs on CPU3
cpus = "1"
# Number of Virtual CPUS to use, default is 1
vcpus = 1
#----------------------------------------------------------------------------
# Define network interfaces.
# By default, no network interfaces are configured. You may have one created
# with sensible defaults using an empty vif clause:
#
# vif = [ '' ]
#
# or optionally override backend, bridge, ip, mac, script, type, or vifname:
#
# vif = [ 'mac=00:16:3e:00:00:11, bridge=xenbr0' ]
#
# or more than one interface may be configured:
#
# vif = [ '', 'bridge=xenbr1' ]
vif = [ 'bridge=xenbr0' ]
#----------------------------------------------------------------------------
# Define the disk devices you want the domain to have access to, and
# what you want them accessible as.
# Each disk entry is of the form phy:UNAME,DEV,MODE
# where UNAME is the device, DEV is the device name the domain will see,
# and MODE is r for read-only, w for read-write.
#disk = [ 'tap:aio:/var/xen/mailserver.img,xvda1,w', 'phy:/dev/drbd1,xvda2,w' ]
disk = [ 'tap:aio:/var/xen/bmsbackup_new.img,xvda1,w', 'phy:/dev/vm/dati,xvda2,w', 'tap:aio:/var/xen/bmsbackup.swap,xvda3,w' ]
#----------------------------------------------------------------------------
# Define frame buffer device.
#
# By default, no frame buffer device is configured.
#
# To create one using the SDL backend and sensible defaults:
#
# vfb = [ 'sdl=1' ]
#
# This uses environment variables XAUTHORITY and DISPLAY. You
# can override that:
#
# vfb = [ 'sdl=1,xauthority=/home/bozo/.Xauthority,display=:1' ]
#
# To create one using the VNC backend and sensible defaults:
#
#vfb = [ 'vnc=1' ]
vnc=1
#
# The backend listens on 127.0.0.1 port 5900+N by default, where N is
# the domain ID. You can override both address and N:
#
# vfb = [ 'vnc=1,vnclisten=127.0.0.1,vncdisplay=1' ]
#
# Or you can bind the first unused port above 5900:
#
# vfb = [ 'vnc=1,vnclisten=0.0.0.0,vncunused=1' ]
#
# You can override the password:
#
# vfb = [ 'vnc=1,vncpasswd=MYPASSWD' ]
#
# Empty password disables authentication. Defaults to the vncpasswd
# configured in xend-config.sxp.
#----------------------------------------------------------------------------
# Define to which TPM instance the user domain should communicate.
# The vtpm entry is of the form 'instance=INSTANCE,backend=DOM'
# where INSTANCE indicates the instance number of the TPM the VM
# should be talking to and DOM provides the domain where the backend
# is located.
# Note that no two virtual machines should try to connect to the same
# TPM instance. The handling of all TPM instances does require
# some management effort in so far that VM configration files (and thus
# a VM) should be associated with a TPM instance throughout the lifetime
# of the VM / VM configuration file. The instance number must be
# greater or equal to 1.
#vtpm = [ 'instance=1,backend=0' ]
#----------------------------------------------------------------------------
# Set the kernel command line for the new domain.
# You only need to define the IP parameters and hostname if the domain's
# IP config doesn't, e.g. in ifcfg-eth0 or via DHCP.
# You can use 'extra' to set the runlevel and custom environment
# variables used by custom rc scripts (e.g. VMID=, usr= ).
# Set if you want dhcp to allocate the IP address.
#dhcp="dhcp"
# Set netmask.
#netmask=
# Set default gateway.
#gateway=
# Set the hostname.
#hostname= "vm%d" % vmid
# Set root device.
root = "/dev/xvda1"
console = "hvc0"
# Root device for nfs.
#root = "/dev/nfs"
# The nfs server.
#nfs_server = '192.0.2.1'
# Root directory on the nfs server.
#nfs_root = '/full/path/to/root/directory'
# Sets runlevel 4.
#extra = "4"
extra = "xencons=hvc0"
#----------------------------------------------------------------------------
# Configure the behaviour when a domain exits. There are three 'reasons'
# for a domain to stop: poweroff, reboot, and crash. For each of these you
# may specify:
#
# "destroy", meaning that the domain is cleaned up as normal;
# "restart", meaning that a new domain is started in place of the old
# one;
# "preserve", meaning that no clean-up is done until the domain is
# manually destroyed (using xm destroy, for example); or
# "rename-restart", meaning that the old domain is not cleaned up, but is
# renamed and a new domain started in its place.
#
# In the event a domain stops due to a crash, you have the additional options:
#
# "coredump-destroy", meaning dump the crashed domain's core and then destroy;
# "coredump-restart', meaning dump the crashed domain's core and the restart.
#
# The default is
#
# on_poweroff = 'destroy'
# on_reboot = 'restart'
# on_crash = 'restart'
#
# For backwards compatibility we also support the deprecated option restart
#
# restart = 'onreboot' means on_poweroff = 'destroy'
# on_reboot = 'restart'
# on_crash = 'destroy'
#
# restart = 'always' means on_poweroff = 'restart'
# on_reboot = 'restart'
# on_crash = 'restart'
#
# restart = 'never' means on_poweroff = 'destroy'
# on_reboot = 'destroy'
# on_crash = 'destroy'
#on_poweroff = 'destroy'
#on_reboot = 'restart'
#on_crash = 'restart'
#-----------------------------------------------------------------------------
# Configure PVSCSI devices:
#
#vscsi=[ 'PDEV, VDEV' ]
#
# PDEV gives physical SCSI device to be attached to specified guest
# domain by one of the following identifier format.
# - XX:XX:XX:XX (4-tuples with decimal notation which shows
# "host:channel:target:lun")
# - /dev/sdxx or sdx
# - /dev/stxx or stx
# - /dev/sgxx or sgx
# - result of 'scsi_id -gu -s'.
# ex. # scsi_id -gu -s /block/sdb
# 36000b5d0006a0000006a0257004c0000
#
# VDEV gives virtual SCSI device by 4-tuples (XX:XX:XX:XX) as
# which the specified guest domain recognize.
#
#vscsi = [ '/dev/sdx, 0:0:0:0' ]
#============================================================================
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[-- Attachment #4: luca_tongiani.vcf --]
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_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xen.org
http://lists.xen.org/xen-devel
^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: Question about VirtIO on Xen - Disk performance issues
2016-01-05 12:22 ` Luca Tongiani
@ 2016-01-05 12:42 ` Stefano Stabellini
2016-01-05 13:52 ` Luca Tongiani
2016-01-05 14:05 ` Luca Tongiani
0 siblings, 2 replies; 12+ messages in thread
From: Stefano Stabellini @ 2016-01-05 12:42 UTC (permalink / raw)
To: Luca Tongiani; +Cc: xen-devel, Stefano Stabellini
The xenstore-ls output is not complete. Could you please send it again?
I noticed from the DomU config file that it is not a Windows VM, as
previously discussed, but a Linux VM. That is OK, but of course in that
case you won't be able to use the Windows PV drivers which I linked.
Linux has its own set of drivers. Did you enable the Xen PV frontends in
the Linux kernel you use (/var/xen/boot/vmlinuz-4.0.5-gentoo_bmsbackup)?
Did you compile them a built-in or as modules?
On Tue, 5 Jan 2016, Luca Tongiani wrote:
> Hi,
> thanks in advance for your reply :)
>
>
> I have attached the following email configuration DomU and the output you have requested .
> Performance disk are all my machines the most serious problem , even if they are used powerful hardware .
> Differences in Disk writing in DomU are 1/3 of those of the Dom0 .
>
>
> Thank you in advance Luca
>
>
>
>
>
>
>
> Il 05/01/2016 12:09, Stefano Stabellini ha scritto:
>
> Could you please post your VM config file and the output of
> xenstore-ls once the VM has completed the boot sequence?
>
> On Tue, 5 Jan 2016, Luca Tongiani wrote:
>
> Hi Stefano,
> im writing to you because im having issue with I/O disk in my DomU With Xen (Gentoo based system).
>
> I tried to use the driver that you provided for the PV .
> But the results are still not good , there is no way to support the use of Xen VirtIO disk ? Many thanks in
> advance
>
> Luca
>
> Il 12/16/15 12:31, Stefano Stabellini ha scritto:
>
> Hello Luca,
>
> the recommended way to increase disk performance would be to use Xen PV
> disks. You just need to install the Windows PV drivers:
>
> http://www.xenproject.org/developers/teams/windows-pv-drivers.html
>
> But using VirtIO disk should also increase performance, even though
> most probably not as much.
>
> Cheers,
>
> Stefano
>
> On Tue, 15 Dec 2015, Luca Tongiani wrote:
>
> Hi to all,
> I'm writing you this mail for asking some advice about a great problem i'm havin in running a Windows VM
> (HVM) onto a Xen (Gentoo based) Hypevisor.
>
> I need to achieve maximum performance from this VM because of intense SQL tasks running in it.
>
> I've seen good improvement in IO on disk using VirtIO on a Windows VM onto a QEMU (QNAP) hypervisor, and i'm
> tryin to use this feature also on my Xen HV.
> Is VirtIO disk a good way to improve performance?
>
> Thx in advance and hope to keep in touch
> --
>
> Luca Tongiani
>
> Sinte srl
> Soluzioni Informatiche e Telematiche
> via Monte Grappa 4/B
> 20900 Monza (MB)
>
> Cel (+39) 339 745 49 21
> Tel (+39) 039 200 59 60
> Fax (+39) 039 200 69 42
> Web www.sinte.net
>
>
>
>
> --
>
> Luca Tongiani
>
> Sinte srl
> Soluzioni Informatiche e Telematiche
> via Monte Grappa 4/B
> 20900 Monza (MB)
>
> Tel (+39) 039 200 59 60
> Fax (+39) 039 200 69 42
> Web www.sinte.net
>
>
>
>
> --
>
> Luca Tongiani
>
> Sinte srl
> Soluzioni Informatiche e Telematiche
> via Monte Grappa 4/B
> 20900 Monza (MB)
>
> Tel (+39) 039 200 59 60
> Fax (+39) 039 200 69 42
> Web www.sinte.net
>
>
>
^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: Question about VirtIO on Xen - Disk performance issues
2016-01-05 12:42 ` Stefano Stabellini
@ 2016-01-05 13:52 ` Luca Tongiani
2016-01-05 14:05 ` Stefano Stabellini
2016-01-05 14:05 ` Luca Tongiani
1 sibling, 1 reply; 12+ messages in thread
From: Luca Tongiani @ 2016-01-05 13:52 UTC (permalink / raw)
To: Stefano Stabellini; +Cc: xen-devel
[-- Attachment #1.1: Type: text/plain, Size: 3715 bytes --]
Sorry but I sent these logs because I have no longer available the
Virtualizer of Windows DomU .
In any case the problem of the performance of disks is present both in
the case of Linux machines PV and Windows machines HVM .
I attach the complete log of the server and the conf of my HVM Windows
Machine.
Thanks again
Il 05/01/2016 13:42, Stefano Stabellini ha scritto:
> The xenstore-ls output is not complete. Could you please send it again?
>
> I noticed from the DomU config file that it is not a Windows VM, as
> previously discussed, but a Linux VM. That is OK, but of course in that
> case you won't be able to use the Windows PV drivers which I linked.
> Linux has its own set of drivers. Did you enable the Xen PV frontends in
> the Linux kernel you use (/var/xen/boot/vmlinuz-4.0.5-gentoo_bmsbackup)?
> Did you compile them a built-in or as modules?
>
> On Tue, 5 Jan 2016, Luca Tongiani wrote:
>> Hi,
>> thanks in advance for your reply :)
>>
>>
>> I have attached the following email configuration DomU and the output you have requested .
>> Performance disk are all my machines the most serious problem , even if they are used powerful hardware .
>> Differences in Disk writing in DomU are 1/3 of those of the Dom0 .
>>
>>
>> Thank you in advance Luca
>>
>>
>>
>>
>>
>>
>>
>> Il 05/01/2016 12:09, Stefano Stabellini ha scritto:
>>
>> Could you please post your VM config file and the output of
>> xenstore-ls once the VM has completed the boot sequence?
>>
>> On Tue, 5 Jan 2016, Luca Tongiani wrote:
>>
>> Hi Stefano,
>> im writing to you because im having issue with I/O disk in my DomU With Xen (Gentoo based system).
>>
>> I tried to use the driver that you provided for the PV .
>> But the results are still not good , there is no way to support the use of Xen VirtIO disk ? Many thanks in
>> advance
>>
>> Luca
>>
>> Il 12/16/15 12:31, Stefano Stabellini ha scritto:
>>
>> Hello Luca,
>>
>> the recommended way to increase disk performance would be to use Xen PV
>> disks. You just need to install the Windows PV drivers:
>>
>> http://www.xenproject.org/developers/teams/windows-pv-drivers.html
>>
>> But using VirtIO disk should also increase performance, even though
>> most probably not as much.
>>
>> Cheers,
>>
>> Stefano
>>
>> On Tue, 15 Dec 2015, Luca Tongiani wrote:
>>
>> Hi to all,
>> I'm writing you this mail for asking some advice about a great problem i'm havin in running a Windows VM
>> (HVM) onto a Xen (Gentoo based) Hypevisor.
>>
>> I need to achieve maximum performance from this VM because of intense SQL tasks running in it.
>>
>> I've seen good improvement in IO on disk using VirtIO on a Windows VM onto a QEMU (QNAP) hypervisor, and i'm
>> tryin to use this feature also on my Xen HV.
>> Is VirtIO disk a good way to improve performance?
>>
>> Thx in advance and hope to keep in touch
>> --
>>
>> Luca Tongiani
>>
>> Sinte srl
>> Soluzioni Informatiche e Telematiche
>> via Monte Grappa 4/B
>> 20900 Monza (MB)
>>
>> Cel (+39) 339 745 49 21
>> Tel (+39) 039 200 59 60
>> Fax (+39) 039 200 69 42
>> Web www.sinte.net
>>
>>
>>
>>
>> --
>>
>> Luca Tongiani
>>
>> Sinte srl
>> Soluzioni Informatiche e Telematiche
>> via Monte Grappa 4/B
>> 20900 Monza (MB)
>>
>> Tel (+39) 039 200 59 60
>> Fax (+39) 039 200 69 42
>> Web www.sinte.net
>>
>>
>>
>>
>> --
>>
>> Luca Tongiani
>>
>> Sinte srl
>> Soluzioni Informatiche e Telematiche
>> via Monte Grappa 4/B
>> 20900 Monza (MB)
>>
>> Tel (+39) 039 200 59 60
>> Fax (+39) 039 200 69 42
>> Web www.sinte.net
>>
>>
>>
--
*Luca Tongiani*
*Sinte* srl
Soluzioni Informatiche e Telematiche
via Monte Grappa 4/B
20900 Monza (MB)
*Tel* (+39) 039 200 59 60
*Fax* (+39) 039 200 69 42
*Web* www.sinte.net <http://www.sinte.net/>
[-- Attachment #1.2: Type: text/html, Size: 5313 bytes --]
[-- Attachment #2: xenstore-ls_output --]
[-- Type: text/plain, Size: 85035 bytes --]
tool = ""
xenstored = ""
vm = ""
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on_xend_stop = "ignore"
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ostype = "linux"
kernel = "/var/xen/boot/vmlinuz-2.6.32-gentoo-r7"
cmdline = "root=/dev/xvda1 "
ramdisk = ""
device = ""
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51713 = ""
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console = ""
0 = ""
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frontend-id = "1"
backend-id = "0"
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name = "Domain-0"
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image = "(linux (kernel /var/xen/boot/vmlinuz-2.6.32-gentoo-r7) (args 'roo\..."
ostype = "linux"
kernel = "/var/xen/boot/vmlinuz-2.6.32-gentoo-r7"
cmdline = "root=/dev/xvda1 "
ramdisk = ""
device = ""
vbd = ""
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on_crash = "restart"
xend = ""
restart_count = "0"
vcpus = "2"
vcpu_avail = "3"
bootloader = ""
name = "Domain-0"
00000000-0000-0000-0000-000000000000-47 = ""
on_xend_stop = "ignore"
pool_name = "Pool-0"
shadow_memory = "0"
uuid = "00000000-0000-0000-0000-000000000000"
on_reboot = "restart"
image = "(linux (kernel '') (superpages 0) (nomigrate 0) (tsc_mode 0))"
ostype = "linux"
kernel = ""
cmdline = ""
ramdisk = ""
on_poweroff = "destroy"
bootloader_args = ""
on_xend_start = "ignore"
on_crash = "restart"
xend = ""
restart_count = "0"
vcpus = "2"
vcpu_avail = "3"
bootloader = ""
name = "Domain-0"
158523a4-c292-405f-b895-f3ea02a4c427 = ""
uuid = "158523a4-c292-405f-b895-f3ea02a4c427"
name = "bmsbackup"
image = ""
ostype = "linux"
kernel = "/var/xen/boot/vmlinuz-2.6.38-gentoo-r6"
cmdline = "root=/dev/xvda1 xencons=hvc0"
start_time = "1387816289.55"
27b758c5-1f4b-40c6-9a37-8b57a1be99e0 = ""
uuid = "27b758c5-1f4b-40c6-9a37-8b57a1be99e0"
name = "bmsbackup"
image = ""
ostype = "linux"
kernel = "/var/xen/boot/vmlinuz-2.6.38-gentoo-r6"
cmdline = "root=/dev/xvda1 xencons=hvc0"
start_time = "1413549247.34"
531ce695-95e3-4d17-b5d9-f11771031fb6 = ""
uuid = "531ce695-95e3-4d17-b5d9-f11771031fb6"
name = "firewall"
image = ""
ostype = "linux"
kernel = "/var/xen/boot/vmlinuz-3.10.25-gentoofirewall"
cmdline = "root=/dev/xvda1 "
start_time = "1416139245.61"
c10a3ae2-f4e8-409c-9aa4-1fcadb0966e1 = ""
uuid = "c10a3ae2-f4e8-409c-9aa4-1fcadb0966e1"
name = "bmsbackup"
image = ""
ostype = "linux"
kernel = "/var/xen/boot/vmlinuz-2.6.38-gentoo-r6"
cmdline = "root=/dev/xvda1 xencons=hvc0"
start_time = "1418296824.62"
a854f8d9-d47d-4d95-8f1e-083344a0e230 = ""
uuid = "a854f8d9-d47d-4d95-8f1e-083344a0e230"
name = "bmsbackup"
image = ""
ostype = "linux"
kernel = "/var/xen/boot/vmlinuz-2.6.38-gentoo-r6"
cmdline = "root=/dev/xvda1 xencons=hvc0"
start_time = "1425122324.13"
5e3ab279-17fd-462e-a7c2-c22bca7fdeec = ""
uuid = "5e3ab279-17fd-462e-a7c2-c22bca7fdeec"
name = "firewall"
image = ""
ostype = "linux"
kernel = "/var/xen/boot/vmlinuz-3.10.25-gentoofirewall"
cmdline = "root=/dev/xvda1 "
start_time = "1425480647.41"
6951fa0a-0335-43c5-8e78-b19293e95ede = ""
uuid = "6951fa0a-0335-43c5-8e78-b19293e95ede"
name = "firewall"
image = ""
ostype = "linux"
kernel = "/var/xen/boot/vmlinuz-3.10.25-gentoofirewall"
cmdline = "root=/dev/xvda1 "
start_time = "1427878793.60"
aedabde5-2beb-4c4a-a54d-54b20983aab6 = ""
uuid = "aedabde5-2beb-4c4a-a54d-54b20983aab6"
name = "bmsbackup"
image = ""
ostype = "linux"
kernel = "/var/xen/boot/vmlinuz-2.6.38-gentoo-r6"
cmdline = "root=/dev/xvda1 xencons=hvc0"
start_time = "1427878801.91"
331ea414-e228-43d7-9763-73409685bfd5 = ""
uuid = "331ea414-e228-43d7-9763-73409685bfd5"
name = "firewall"
image = ""
ostype = "linux"
kernel = "/var/xen/boot/vmlinuz-3.10.25-gentoofirewall"
cmdline = "root=/dev/xvda1 "
start_time = "1427890427.00"
75f97aaa-bbcf-464f-8164-842e3c689d8d = ""
uuid = "75f97aaa-bbcf-464f-8164-842e3c689d8d"
name = "bmsbackup"
image = ""
ostype = "linux"
kernel = "/var/xen/boot/vmlinuz-2.6.38-gentoo-r6"
cmdline = "root=/dev/xvda1 xencons=hvc0"
start_time = "1427890434.37"
4b2b2052-a20e-42ee-8b3b-49283e444181 = ""
uuid = "4b2b2052-a20e-42ee-8b3b-49283e444181"
name = "firewall"
image = ""
ostype = "linux"
kernel = "/var/xen/boot/vmlinuz-3.10.25-gentoofirewall"
cmdline = "root=/dev/xvda1 "
start_time = "1429790786.47"
d55c3ba1-497e-4308-96d1-afaf1d6cf0cc = ""
uuid = "d55c3ba1-497e-4308-96d1-afaf1d6cf0cc"
name = "bmsbackup"
image = ""
ostype = "linux"
kernel = "/var/xen/boot/vmlinuz-2.6.38-gentoo-r6"
cmdline = "root=/dev/xvda1 xencons=hvc0"
start_time = "1429790794.58"
d8b1081d-dc33-4cd6-aa93-191853d0f633 = ""
uuid = "d8b1081d-dc33-4cd6-aa93-191853d0f633"
name = "firewall"
image = ""
ostype = "linux"
kernel = "/var/xen/boot/vmlinuz-3.10.25-gentoofirewall"
cmdline = "root=/dev/xvda1 "
start_time = "1429798573.92"
c2e85ca0-83e1-4be3-bdda-0e0040f10b47 = ""
uuid = "c2e85ca0-83e1-4be3-bdda-0e0040f10b47"
name = "bmsbackup"
image = ""
ostype = "linux"
kernel = "/var/xen/boot/vmlinuz-2.6.38-gentoo-r6"
cmdline = "root=/dev/xvda1 xencons=hvc0"
start_time = "1429806340.26"
ed1b96a9-057a-4660-ae9d-e98ebfbd0d47 = ""
uuid = "ed1b96a9-057a-4660-ae9d-e98ebfbd0d47"
name = "firewall"
image = ""
ostype = "linux"
kernel = "/var/xen/boot/vmlinuz-3.10.25-gentoofirewall"
cmdline = "root=/dev/xvda1 "
start_time = "1429973950.62"
fec86724-08f5-4b7c-8061-12d8c3b0de9b = ""
uuid = "fec86724-08f5-4b7c-8061-12d8c3b0de9b"
name = "bmsbackup"
image = ""
ostype = "linux"
kernel = "/var/xen/boot/vmlinuz-2.6.38-gentoo-r6"
cmdline = "root=/dev/xvda1 xencons=hvc0"
start_time = "1429973958.74"
6cadbc67-b2c6-4d21-966c-34837107ab45 = ""
uuid = "6cadbc67-b2c6-4d21-966c-34837107ab45"
name = "firewall"
image = ""
ostype = "linux"
kernel = "/var/xen/boot/vmlinuz-3.10.25-gentoofirewall"
cmdline = "root=/dev/xvda1 "
start_time = "1434875583.55"
d7cd9082-22f4-47bb-b07a-7aa56f94d62d = ""
uuid = "d7cd9082-22f4-47bb-b07a-7aa56f94d62d"
name = "bmsbackup"
image = ""
ostype = "linux"
kernel = "/var/xen/boot/vmlinuz-4.0.5-gentoo_bmsbackup"
cmdline = "root=/dev/xvda1 xencons=hvc0"
start_time = "1443517597.19"
b78291fa-d2f7-4445-97df-498e72bc3690 = ""
uuid = "b78291fa-d2f7-4445-97df-498e72bc3690"
name = "firewall"
image = ""
ostype = "linux"
kernel = "/var/xen/boot/vmlinuz-3.10.25-gentoofirewall"
cmdline = "root=/dev/xvda1 "
start_time = "1446122496.90"
89b44de7-9ba1-4172-8b18-32283fa47ff5 = ""
uuid = "89b44de7-9ba1-4172-8b18-32283fa47ff5"
name = "bmsbackup"
image = ""
ostype = "linux"
kernel = "/var/xen/boot/vmlinuz-4.0.5-gentoo_bmsbackup"
cmdline = "root=/dev/xvda1 xencons=hvc0"
start_time = "1447710951.27"
0400cb60-2559-466b-a8f0-a82e0b5257b8 = ""
uuid = "0400cb60-2559-466b-a8f0-a82e0b5257b8"
name = "firewall"
image = ""
ostype = "linux"
kernel = "/var/xen/boot/vmlinuz-3.10.25-gentoofirewall"
cmdline = "root=/dev/xvda1 "
start_time = "1450431393.48"
ee96c88a-df2c-40f3-b57b-2d6998cbd74d = ""
uuid = "ee96c88a-df2c-40f3-b57b-2d6998cbd74d"
name = "bmsbackup"
image = ""
ostype = "linux"
kernel = "/var/xen/boot/vmlinuz-4.0.5-gentoo_bmsbackup"
cmdline = "root=/dev/xvda1 xencons=hvc0"
start_time = "1450699608.42"
libxl = ""
9 = ""
dm-version = "qemu_xen"
4 = ""
dm-version = "qemu_xen"
5 = ""
dm-version = "qemu_xen"
local = ""
domain = ""
0 = ""
name = "Domain-0"
libxl = ""
disable_udev = "1"
backend = ""
qdisk = ""
4 = ""
51713 = ""
frontend = "/local/domain/4/device/vbd/51713"
params = "aio:/var/xen/firewall.img"
frontend-id = "4"
online = "1"
removable = "0"
bootable = "1"
state = "4"
dev = "xvda1"
type = "qdisk"
mode = "w"
device-type = "disk"
feature-flush-cache = "1"
feature-persistent = "1"
info = "0"
hotplug-status = "connected"
sector-size = "512"
sectors = "41943040"
51714 = ""
frontend = "/local/domain/4/device/vbd/51714"
params = "aio:/var/xen/firewall.swap"
frontend-id = "4"
online = "1"
removable = "0"
bootable = "1"
state = "4"
dev = "xvda2"
type = "qdisk"
mode = "w"
device-type = "disk"
feature-flush-cache = "1"
feature-persistent = "1"
info = "0"
hotplug-status = "connected"
sector-size = "512"
sectors = "4194304"
5 = ""
51713 = ""
frontend = "/local/domain/5/device/vbd/51713"
params = "aio:/var/xen/bmsbackup_new.img"
frontend-id = "5"
online = "1"
removable = "0"
bootable = "1"
state = "4"
dev = "xvda1"
type = "qdisk"
mode = "w"
device-type = "disk"
feature-flush-cache = "1"
feature-persistent = "1"
info = "0"
hotplug-status = "connected"
sector-size = "512"
sectors = "41943040"
51715 = ""
frontend = "/local/domain/5/device/vbd/51715"
params = "aio:/var/xen/bmsbackup.swap"
frontend-id = "5"
online = "1"
removable = "0"
bootable = "1"
state = "4"
dev = "xvda3"
type = "qdisk"
mode = "w"
device-type = "disk"
feature-flush-cache = "1"
feature-persistent = "1"
info = "0"
hotplug-status = "connected"
sector-size = "512"
sectors = "4194304"
console = ""
4 = ""
0 = ""
frontend = "/local/domain/4/console"
frontend-id = "4"
online = "1"
state = "1"
domain = "firewall"
protocol = "vt100"
5 = ""
0 = ""
frontend = "/local/domain/5/console"
frontend-id = "5"
online = "1"
state = "1"
domain = "bmsbackup"
protocol = "vt100"
vif = ""
4 = ""
0 = ""
frontend = "/local/domain/4/device/vif/0"
frontend-id = "4"
online = "1"
state = "4"
script = "/etc/xen/scripts/vif-bridge"
mac = "00:16:3e:6a:68:d5"
bridge = "xenbr0"
handle = "0"
type = "vif"
feature-sg = "1"
feature-gso-tcpv4 = "1"
feature-rx-copy = "1"
feature-rx-flip = "0"
hotplug-status = "connected"
1 = ""
frontend = "/local/domain/4/device/vif/1"
frontend-id = "4"
online = "1"
state = "4"
script = "/etc/xen/scripts/vif-bridge"
mac = "00:16:3e:2c:67:ca"
bridge = "xenbr1"
handle = "1"
type = "vif"
feature-sg = "1"
feature-gso-tcpv4 = "1"
feature-rx-copy = "1"
feature-rx-flip = "0"
hotplug-status = "connected"
5 = ""
0 = ""
frontend = "/local/domain/5/device/vif/0"
frontend-id = "5"
online = "1"
state = "4"
script = "/etc/xen/scripts/vif-bridge"
mac = "00:16:3e:6f:88:74"
bridge = "xenbr0"
handle = "0"
type = "vif"
feature-sg = "1"
feature-gso-tcpv4 = "1"
feature-rx-copy = "1"
feature-rx-flip = "0"
hotplug-status = "connected"
vbd = ""
5 = ""
51714 = ""
frontend = "/local/domain/5/device/vbd/51714"
params = "/dev/vm/dati"
script = "/etc/xen/scripts/block"
physical-device = "fd:1"
frontend-id = "5"
online = "1"
removable = "0"
bootable = "1"
state = "4"
dev = "xvda2"
type = "phy"
mode = "w"
device-type = "disk"
feature-flush-cache = "1"
feature-discard = "0"
feature-barrier = "1"
feature-persistent = "1"
sectors = "15107883008"
info = "0"
sector-size = "512"
device-model = ""
4 = ""
state = "running"
5 = ""
state = "running"
4 = ""
vm = "/vm/0400cb60-2559-466b-a8f0-a82e0b5257b8"
name = "firewall"
cpu = ""
0 = ""
availability = "online"
memory = ""
static-max = "524288"
target = "524289"
videoram = "-1"
device = ""
suspend = ""
event-channel = ""
vbd = ""
51713 = ""
backend = "/local/domain/0/backend/qdisk/4/51713"
backend-id = "0"
state = "4"
virtual-device = "51713"
device-type = "disk"
protocol = "x86_64-abi"
ring-ref = "8"
event-channel = "9"
feature-persistent = "1"
51714 = ""
backend = "/local/domain/0/backend/qdisk/4/51714"
backend-id = "0"
state = "4"
virtual-device = "51714"
device-type = "disk"
protocol = "x86_64-abi"
ring-ref = "9"
event-channel = "10"
feature-persistent = "1"
vif = ""
0 = ""
backend = "/local/domain/0/backend/vif/4/0"
backend-id = "0"
state = "4"
handle = "0"
mac = "00:16:3e:6a:68:d5"
tx-ring-ref = "10"
rx-ring-ref = "11"
event-channel = "11"
request-rx-copy = "1"
feature-rx-notify = "1"
feature-sg = "1"
feature-gso-tcpv4 = "1"
1 = ""
backend = "/local/domain/0/backend/vif/4/1"
backend-id = "0"
state = "4"
handle = "1"
mac = "00:16:3e:2c:67:ca"
tx-ring-ref = "12"
rx-ring-ref = "13"
event-channel = "12"
request-rx-copy = "1"
feature-rx-notify = "1"
feature-sg = "1"
feature-gso-tcpv4 = "1"
control = ""
shutdown = ""
platform-feature-multiprocessor-suspend = "1"
platform-feature-xs_reset_watches = "1"
data = ""
domid = "4"
store = ""
port = "1"
ring-ref = "901970"
console = ""
backend = "/local/domain/0/backend/console/4/0"
backend-id = "0"
limit = "1048576"
type = "xenconsoled"
output = "pty"
tty = "/dev/pts/0"
port = "2"
ring-ref = "901969"
image = ""
device-model-pid = "2953"
5 = ""
vm = "/vm/ee96c88a-df2c-40f3-b57b-2d6998cbd74d"
name = "bmsbackup"
cpu = ""
0 = ""
availability = "online"
memory = ""
static-max = "2097152"
target = "2097153"
videoram = "-1"
device = ""
suspend = ""
event-channel = ""
vbd = ""
51713 = ""
backend = "/local/domain/0/backend/qdisk/5/51713"
backend-id = "0"
state = "4"
virtual-device = "51713"
device-type = "disk"
protocol = "x86_64-abi"
ring-ref = "8"
event-channel = "9"
feature-persistent = "1"
51714 = ""
backend = "/local/domain/0/backend/vbd/5/51714"
backend-id = "0"
state = "4"
virtual-device = "51714"
device-type = "disk"
protocol = "x86_64-abi"
ring-ref = "9"
event-channel = "10"
feature-persistent = "1"
51715 = ""
backend = "/local/domain/0/backend/qdisk/5/51715"
backend-id = "0"
state = "4"
virtual-device = "51715"
device-type = "disk"
protocol = "x86_64-abi"
ring-ref = "10"
event-channel = "11"
feature-persistent = "1"
vif = ""
0 = ""
backend = "/local/domain/0/backend/vif/5/0"
backend-id = "0"
state = "4"
handle = "0"
mac = "00:16:3e:6f:88:74"
tx-ring-ref = "768"
rx-ring-ref = "769"
event-channel = "12"
request-rx-copy = "1"
feature-rx-notify = "1"
feature-sg = "1"
feature-gso-tcpv4 = "1"
feature-gso-tcpv6 = "1"
feature-ipv6-csum-offload = "1"
control = ""
shutdown = ""
platform-feature-multiprocessor-suspend = "1"
platform-feature-xs_reset_watches = "1"
data = ""
domid = "5"
store = ""
port = "1"
ring-ref = "762184"
console = ""
backend = "/local/domain/0/backend/console/5/0"
backend-id = "0"
limit = "1048576"
type = "xenconsoled"
output = "pty"
tty = "/dev/pts/2"
port = "2"
ring-ref = "762183"
image = ""
device-model-pid = "4119"
[-- Attachment #3: conf_DomU_Xen --]
[-- Type: text/plain, Size: 8379 bytes --]
# -*- mode: python; -*-
#============================================================================
# Python configuration setup for 'xm create'.
# This script sets the parameters used when a domain is created using 'xm create'.
# You use a separate script for each domain you want to create, or
# you can set the parameters for the domain on the xm command line.
#============================================================================
#----------------------------------------------------------------------------
# Kernel image file.
#kernel = "/var/xen/boot/vmlinuz-2.6.32-gentoo-r7"
#kernel = "/var/xen/boot/vmlinuz-2.6.34-xen"
#kernel = "/var/xen/boot/vmlinuz-2.6.38-gentoo-r6"
kernel = "/var/xen/boot/vmlinuz-4.0.5-gentoo_bmsbackup"
# Optional ramdisk.
#ramdisk = "/boot/initrd.gz"
# The domain build function. Default is 'linux'.
#builder='linux'
# Initial memory allocation (in megabytes) for the new domain.
#
# WARNING: Creating a domain with insufficient memory may cause out of
# memory errors. The domain needs enough memory to boot kernel
# and modules. Allocating less than 32MBs is not recommended.
memory = 2048
# A name for your domain. All domains must have different names.
name = "bmsbackup"
# 128-bit UUID for the domain. The default behavior is to generate a new UUID
# on each call to 'xm create'.
#uuid = "06ed00fe-1162-4fc4-b5d8-11993ee4a8b9"
# List of which CPUS this domain is allowed to use, default Xen picks
#cpus = "" # leave to Xen to pick
#cpus = "0" # all vcpus run on CPU0
#cpus = "0-3,5,^1" # all vcpus run on cpus 0,2,3,5
#cpus = ["2", "3"] # VCPU0 runs on CPU2, VCPU1 runs on CPU3
cpus = "1"
# Number of Virtual CPUS to use, default is 1
vcpus = 1
#----------------------------------------------------------------------------
# Define network interfaces.
# By default, no network interfaces are configured. You may have one created
# with sensible defaults using an empty vif clause:
#
# vif = [ '' ]
#
# or optionally override backend, bridge, ip, mac, script, type, or vifname:
#
# vif = [ 'mac=00:16:3e:00:00:11, bridge=xenbr0' ]
#
# or more than one interface may be configured:
#
# vif = [ '', 'bridge=xenbr1' ]
vif = [ 'bridge=xenbr0' ]
#----------------------------------------------------------------------------
# Define the disk devices you want the domain to have access to, and
# what you want them accessible as.
# Each disk entry is of the form phy:UNAME,DEV,MODE
# where UNAME is the device, DEV is the device name the domain will see,
# and MODE is r for read-only, w for read-write.
#disk = [ 'tap:aio:/var/xen/mailserver.img,xvda1,w', 'phy:/dev/drbd1,xvda2,w' ]
disk = [ 'tap:aio:/var/xen/bmsbackup_new.img,xvda1,w', 'phy:/dev/vm/dati,xvda2,w', 'tap:aio:/var/xen/bmsbackup.swap,xvda3,w' ]
#----------------------------------------------------------------------------
# Define frame buffer device.
#
# By default, no frame buffer device is configured.
#
# To create one using the SDL backend and sensible defaults:
#
# vfb = [ 'sdl=1' ]
#
# This uses environment variables XAUTHORITY and DISPLAY. You
# can override that:
#
# vfb = [ 'sdl=1,xauthority=/home/bozo/.Xauthority,display=:1' ]
#
# To create one using the VNC backend and sensible defaults:
#
#vfb = [ 'vnc=1' ]
vnc=1
#
# The backend listens on 127.0.0.1 port 5900+N by default, where N is
# the domain ID. You can override both address and N:
#
# vfb = [ 'vnc=1,vnclisten=127.0.0.1,vncdisplay=1' ]
#
# Or you can bind the first unused port above 5900:
#
# vfb = [ 'vnc=1,vnclisten=0.0.0.0,vncunused=1' ]
#
# You can override the password:
#
# vfb = [ 'vnc=1,vncpasswd=MYPASSWD' ]
#
# Empty password disables authentication. Defaults to the vncpasswd
# configured in xend-config.sxp.
#----------------------------------------------------------------------------
# Define to which TPM instance the user domain should communicate.
# The vtpm entry is of the form 'instance=INSTANCE,backend=DOM'
# where INSTANCE indicates the instance number of the TPM the VM
# should be talking to and DOM provides the domain where the backend
# is located.
# Note that no two virtual machines should try to connect to the same
# TPM instance. The handling of all TPM instances does require
# some management effort in so far that VM configration files (and thus
# a VM) should be associated with a TPM instance throughout the lifetime
# of the VM / VM configuration file. The instance number must be
# greater or equal to 1.
#vtpm = [ 'instance=1,backend=0' ]
#----------------------------------------------------------------------------
# Set the kernel command line for the new domain.
# You only need to define the IP parameters and hostname if the domain's
# IP config doesn't, e.g. in ifcfg-eth0 or via DHCP.
# You can use 'extra' to set the runlevel and custom environment
# variables used by custom rc scripts (e.g. VMID=, usr= ).
# Set if you want dhcp to allocate the IP address.
#dhcp="dhcp"
# Set netmask.
#netmask=
# Set default gateway.
#gateway=
# Set the hostname.
#hostname= "vm%d" % vmid
# Set root device.
root = "/dev/xvda1"
console = "hvc0"
# Root device for nfs.
#root = "/dev/nfs"
# The nfs server.
#nfs_server = '192.0.2.1'
# Root directory on the nfs server.
#nfs_root = '/full/path/to/root/directory'
# Sets runlevel 4.
#extra = "4"
extra = "xencons=hvc0"
#----------------------------------------------------------------------------
# Configure the behaviour when a domain exits. There are three 'reasons'
# for a domain to stop: poweroff, reboot, and crash. For each of these you
# may specify:
#
# "destroy", meaning that the domain is cleaned up as normal;
# "restart", meaning that a new domain is started in place of the old
# one;
# "preserve", meaning that no clean-up is done until the domain is
# manually destroyed (using xm destroy, for example); or
# "rename-restart", meaning that the old domain is not cleaned up, but is
# renamed and a new domain started in its place.
#
# In the event a domain stops due to a crash, you have the additional options:
#
# "coredump-destroy", meaning dump the crashed domain's core and then destroy;
# "coredump-restart', meaning dump the crashed domain's core and the restart.
#
# The default is
#
# on_poweroff = 'destroy'
# on_reboot = 'restart'
# on_crash = 'restart'
#
# For backwards compatibility we also support the deprecated option restart
#
# restart = 'onreboot' means on_poweroff = 'destroy'
# on_reboot = 'restart'
# on_crash = 'destroy'
#
# restart = 'always' means on_poweroff = 'restart'
# on_reboot = 'restart'
# on_crash = 'restart'
#
# restart = 'never' means on_poweroff = 'destroy'
# on_reboot = 'destroy'
# on_crash = 'destroy'
#on_poweroff = 'destroy'
#on_reboot = 'restart'
#on_crash = 'restart'
#-----------------------------------------------------------------------------
# Configure PVSCSI devices:
#
#vscsi=[ 'PDEV, VDEV' ]
#
# PDEV gives physical SCSI device to be attached to specified guest
# domain by one of the following identifier format.
# - XX:XX:XX:XX (4-tuples with decimal notation which shows
# "host:channel:target:lun")
# - /dev/sdxx or sdx
# - /dev/stxx or stx
# - /dev/sgxx or sgx
# - result of 'scsi_id -gu -s'.
# ex. # scsi_id -gu -s /block/sdb
# 36000b5d0006a0000006a0257004c0000
#
# VDEV gives virtual SCSI device by 4-tuples (XX:XX:XX:XX) as
# which the specified guest domain recognize.
#
#vscsi = [ '/dev/sdx, 0:0:0:0' ]
#============================================================================
[-- Attachment #4: conf_DomU_WindowsHVM --]
[-- Type: text/plain, Size: 2129 bytes --]
# =====================================================================
# Example HVM guest configuration
# =====================================================================
#
# This is a fairly minimal example of what is required for an
# HVM guest. For a more complete guide see xl.cfg(5)
# This configures an HVM rather than PV guest
builder = "hvm"
# Guest name
name = "winzozz"
# 128-bit UUID for the domain as a hexadecimal number.
# Use "uuidgen" to generate one if required.
# The default behavior is to generate a new UUID each time the guest is started.
#uuid = "XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX"
# Enable Microsoft Hyper-V compatibile paravirtualisation /
# enlightenment interfaces. Turning this on can improve Windows guest
# performance and is therefore recommended
#viridian = 1
# Initial memory allocation (MB)
memory = 1024
# Maximum memory (MB)
# If this is greater than `memory' then the slack will start ballooned
# (this assumes guest kernel support for ballooning)
#maxmem = 512
# Number of VCPUS
vcpus = 2
# Network devices
# A list of 'vifspec' entries as described in
# docs/misc/xl-network-configuration.markdown
vif = [ "bridge=xenbr0" ]
# Disk Devices
# A list of `diskspec' entries as described in
# docs/misc/xl-disk-configuration.txt
disk = [ '/dev/vg0/winvirtio,raw,xvda1,rw' ]
device_model = '/usr/lib64/xen/bin/qemu-dm'
# Guest VGA console configuration, either SDL or VNC
vnc = 1
vnclisten="10.2.2.17"
usbdevice = 'tablet'
on_poweroff = 'destroy'
on_reboot = 'restart'
on_crash = 'restart'
acpi = 1
# Fa l'avvio mediante CDROM.
# Cambiare in 'c' al termine dell'installazione.
boot='d'
#boot='c'
[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
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_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xen.org
http://lists.xen.org/xen-devel
^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: Question about VirtIO on Xen - Disk performance issues
2016-01-05 12:42 ` Stefano Stabellini
2016-01-05 13:52 ` Luca Tongiani
@ 2016-01-05 14:05 ` Luca Tongiani
1 sibling, 0 replies; 12+ messages in thread
From: Luca Tongiani @ 2016-01-05 14:05 UTC (permalink / raw)
To: Stefano Stabellini; +Cc: xen-devel
[-- Attachment #1.1: Type: text/plain, Size: 3485 bytes --]
I forgot : all drivers about Xen frontend have been compiled into the
kernel (not module).
Il 05/01/2016 13:42, Stefano Stabellini ha scritto:
> The xenstore-ls output is not complete. Could you please send it again?
>
> I noticed from the DomU config file that it is not a Windows VM, as
> previously discussed, but a Linux VM. That is OK, but of course in that
> case you won't be able to use the Windows PV drivers which I linked.
> Linux has its own set of drivers. Did you enable the Xen PV frontends in
> the Linux kernel you use (/var/xen/boot/vmlinuz-4.0.5-gentoo_bmsbackup)?
> Did you compile them a built-in or as modules?
>
> On Tue, 5 Jan 2016, Luca Tongiani wrote:
>> Hi,
>> thanks in advance for your reply :)
>>
>>
>> I have attached the following email configuration DomU and the output you have requested .
>> Performance disk are all my machines the most serious problem , even if they are used powerful hardware .
>> Differences in Disk writing in DomU are 1/3 of those of the Dom0 .
>>
>>
>> Thank you in advance Luca
>>
>>
>>
>>
>>
>>
>>
>> Il 05/01/2016 12:09, Stefano Stabellini ha scritto:
>>
>> Could you please post your VM config file and the output of
>> xenstore-ls once the VM has completed the boot sequence?
>>
>> On Tue, 5 Jan 2016, Luca Tongiani wrote:
>>
>> Hi Stefano,
>> im writing to you because im having issue with I/O disk in my DomU With Xen (Gentoo based system).
>>
>> I tried to use the driver that you provided for the PV .
>> But the results are still not good , there is no way to support the use of Xen VirtIO disk ? Many thanks in
>> advance
>>
>> Luca
>>
>> Il 12/16/15 12:31, Stefano Stabellini ha scritto:
>>
>> Hello Luca,
>>
>> the recommended way to increase disk performance would be to use Xen PV
>> disks. You just need to install the Windows PV drivers:
>>
>> http://www.xenproject.org/developers/teams/windows-pv-drivers.html
>>
>> But using VirtIO disk should also increase performance, even though
>> most probably not as much.
>>
>> Cheers,
>>
>> Stefano
>>
>> On Tue, 15 Dec 2015, Luca Tongiani wrote:
>>
>> Hi to all,
>> I'm writing you this mail for asking some advice about a great problem i'm havin in running a Windows VM
>> (HVM) onto a Xen (Gentoo based) Hypevisor.
>>
>> I need to achieve maximum performance from this VM because of intense SQL tasks running in it.
>>
>> I've seen good improvement in IO on disk using VirtIO on a Windows VM onto a QEMU (QNAP) hypervisor, and i'm
>> tryin to use this feature also on my Xen HV.
>> Is VirtIO disk a good way to improve performance?
>>
>> Thx in advance and hope to keep in touch
>> --
>>
>> Luca Tongiani
>>
>> Sinte srl
>> Soluzioni Informatiche e Telematiche
>> via Monte Grappa 4/B
>> 20900 Monza (MB)
>>
>> Cel (+39) 339 745 49 21
>> Tel (+39) 039 200 59 60
>> Fax (+39) 039 200 69 42
>> Web www.sinte.net
>>
>>
>>
>>
>> --
>>
>> Luca Tongiani
>>
>> Sinte srl
>> Soluzioni Informatiche e Telematiche
>> via Monte Grappa 4/B
>> 20900 Monza (MB)
>>
>> Tel (+39) 039 200 59 60
>> Fax (+39) 039 200 69 42
>> Web www.sinte.net
>>
>>
>>
>>
>> --
>>
>> Luca Tongiani
>>
>> Sinte srl
>> Soluzioni Informatiche e Telematiche
>> via Monte Grappa 4/B
>> 20900 Monza (MB)
>>
>> Tel (+39) 039 200 59 60
>> Fax (+39) 039 200 69 42
>> Web www.sinte.net
>>
>>
>>
--
*Luca Tongiani*
*Sinte* srl
Soluzioni Informatiche e Telematiche
via Monte Grappa 4/B
20900 Monza (MB)
*Tel* (+39) 039 200 59 60
*Fax* (+39) 039 200 69 42
*Web* www.sinte.net <http://www.sinte.net/>
[-- Attachment #1.2: Type: text/html, Size: 4795 bytes --]
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null
[-- Attachment #3: Type: text/plain, Size: 126 bytes --]
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xen.org
http://lists.xen.org/xen-devel
^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: Question about VirtIO on Xen - Disk performance issues
2016-01-05 13:52 ` Luca Tongiani
@ 2016-01-05 14:05 ` Stefano Stabellini
2016-01-05 14:44 ` Luca Tongiani
0 siblings, 1 reply; 12+ messages in thread
From: Stefano Stabellini @ 2016-01-05 14:05 UTC (permalink / raw)
To: Luca Tongiani; +Cc: xen-devel, Stefano Stabellini
There are a few issues in the config files. In conf_DomU_WindowsHVM:
- device_model is set to /usr/lib64/xen/bin/qemu-dm, which is the old
qemu-xen-traditional device model, known to have worse disk
performance. Just delete this line to use the newer QEMU based tree.
- disk is set to [ '/dev/vg0/winvirtio,raw,xvda1,rw' ], but you cannot
expose only a partition of a disk to a Windows HVM domain. The correct
disk line would be: disk = [ '/dev/vg0/winvirtio,raw,hda,rw' ]
In conf_DomU_Xen:
- you are missing builder="hvm", which means you are using a PV guest
rather than an HVM guest. PV guests tends to be slower on new
hardware.
What version of Xen are you using?
On Tue, 5 Jan 2016, Luca Tongiani wrote:
> Sorry but I sent these logs because I have no longer available the Virtualizer of Windows DomU .
> In any case the problem of the performance of disks is present both in the case of Linux machines PV and Windows
> machines HVM .
> I attach the complete log of the server and the conf of my HVM Windows Machine.
>
> Thanks again
>
>
> Il 05/01/2016 13:42, Stefano Stabellini ha scritto:
>
> The xenstore-ls output is not complete. Could you please send it again?
>
> I noticed from the DomU config file that it is not a Windows VM, as
> previously discussed, but a Linux VM. That is OK, but of course in that
> case you won't be able to use the Windows PV drivers which I linked.
> Linux has its own set of drivers. Did you enable the Xen PV frontends in
> the Linux kernel you use (/var/xen/boot/vmlinuz-4.0.5-gentoo_bmsbackup)?
> Did you compile them a built-in or as modules?
>
> On Tue, 5 Jan 2016, Luca Tongiani wrote:
>
> Hi,
> thanks in advance for your reply :)
>
>
> I have attached the following email configuration DomU and the output you have requested .
> Performance disk are all my machines the most serious problem , even if they are used powerful hardware .
> Differences in Disk writing in DomU are 1/3 of those of the Dom0 .
>
>
> Thank you in advance Luca
>
>
>
>
>
>
>
> Il 05/01/2016 12:09, Stefano Stabellini ha scritto:
>
> Could you please post your VM config file and the output of
> xenstore-ls once the VM has completed the boot sequence?
>
> On Tue, 5 Jan 2016, Luca Tongiani wrote:
>
> Hi Stefano,
> im writing to you because im having issue with I/O disk in my DomU With Xen (Gentoo based system).
>
> I tried to use the driver that you provided for the PV .
> But the results are still not good , there is no way to support the use of Xen VirtIO disk ? Many thanks in
> advance
>
> Luca
>
> Il 12/16/15 12:31, Stefano Stabellini ha scritto:
>
> Hello Luca,
>
> the recommended way to increase disk performance would be to use Xen PV
> disks. You just need to install the Windows PV drivers:
>
> http://www.xenproject.org/developers/teams/windows-pv-drivers.html
>
> But using VirtIO disk should also increase performance, even though
> most probably not as much.
>
> Cheers,
>
> Stefano
>
> On Tue, 15 Dec 2015, Luca Tongiani wrote:
>
> Hi to all,
> I'm writing you this mail for asking some advice about a great problem i'm havin in running a Windows VM
> (HVM) onto a Xen (Gentoo based) Hypevisor.
>
> I need to achieve maximum performance from this VM because of intense SQL tasks running in it.
>
> I've seen good improvement in IO on disk using VirtIO on a Windows VM onto a QEMU (QNAP) hypervisor, and i'm
> tryin to use this feature also on my Xen HV.
> Is VirtIO disk a good way to improve performance?
>
> Thx in advance and hope to keep in touch
> --
>
> Luca Tongiani
>
> Sinte srl
> Soluzioni Informatiche e Telematiche
> via Monte Grappa 4/B
> 20900 Monza (MB)
>
> Cel (+39) 339 745 49 21
> Tel (+39) 039 200 59 60
> Fax (+39) 039 200 69 42
> Web www.sinte.net
>
>
>
>
> --
>
> Luca Tongiani
>
> Sinte srl
> Soluzioni Informatiche e Telematiche
> via Monte Grappa 4/B
> 20900 Monza (MB)
>
> Tel (+39) 039 200 59 60
> Fax (+39) 039 200 69 42
> Web www.sinte.net
>
>
>
>
> --
>
> Luca Tongiani
>
> Sinte srl
> Soluzioni Informatiche e Telematiche
> via Monte Grappa 4/B
> 20900 Monza (MB)
>
> Tel (+39) 039 200 59 60
> Fax (+39) 039 200 69 42
> Web www.sinte.net
>
>
>
>
> --
>
> Luca Tongiani
>
> Sinte srl
> Soluzioni Informatiche e Telematiche
> via Monte Grappa 4/B
> 20900 Monza (MB)
>
> Tel (+39) 039 200 59 60
> Fax (+39) 039 200 69 42
> Web www.sinte.net
>
>
>
^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: Question about VirtIO on Xen - Disk performance issues
2016-01-05 14:05 ` Stefano Stabellini
@ 2016-01-05 14:44 ` Luca Tongiani
2016-01-05 17:24 ` Stefano Stabellini
0 siblings, 1 reply; 12+ messages in thread
From: Luca Tongiani @ 2016-01-05 14:44 UTC (permalink / raw)
To: Stefano Stabellini; +Cc: xen-devel
[-- Attachment #1.1: Type: text/plain, Size: 5126 bytes --]
Hi,
Thanks for the hints , I did experiment with the changes you suggested
and now we were able to achieve the following result : the performance
of the domU is 50 % of the dom0 .
Is it possible to improve these numbers more ?
Also , do you have any advice on where to find extensive documentation
on how to use Xen ?
Thank you
Luca
Il 05/01/2016 15:05, Stefano Stabellini ha scritto:
> There are a few issues in the config files. In conf_DomU_WindowsHVM:
>
> - device_model is set to /usr/lib64/xen/bin/qemu-dm, which is the old
> qemu-xen-traditional device model, known to have worse disk
> performance. Just delete this line to use the newer QEMU based tree.
> - disk is set to [ '/dev/vg0/winvirtio,raw,xvda1,rw' ], but you cannot
> expose only a partition of a disk to a Windows HVM domain. The correct
> disk line would be: disk = [ '/dev/vg0/winvirtio,raw,hda,rw' ]
>
> In conf_DomU_Xen:
>
> - you are missing builder="hvm", which means you are using a PV guest
> rather than an HVM guest. PV guests tends to be slower on new
> hardware.
>
> What version of Xen are you using?
>
>
> On Tue, 5 Jan 2016, Luca Tongiani wrote:
>> Sorry but I sent these logs because I have no longer available the Virtualizer of Windows DomU .
>> In any case the problem of the performance of disks is present both in the case of Linux machines PV and Windows
>> machines HVM .
>> I attach the complete log of the server and the conf of my HVM Windows Machine.
>>
>> Thanks again
>>
>>
>> Il 05/01/2016 13:42, Stefano Stabellini ha scritto:
>>
>> The xenstore-ls output is not complete. Could you please send it again?
>>
>> I noticed from the DomU config file that it is not a Windows VM, as
>> previously discussed, but a Linux VM. That is OK, but of course in that
>> case you won't be able to use the Windows PV drivers which I linked.
>> Linux has its own set of drivers. Did you enable the Xen PV frontends in
>> the Linux kernel you use (/var/xen/boot/vmlinuz-4.0.5-gentoo_bmsbackup)?
>> Did you compile them a built-in or as modules?
>>
>> On Tue, 5 Jan 2016, Luca Tongiani wrote:
>>
>> Hi,
>> thanks in advance for your reply :)
>>
>>
>> I have attached the following email configuration DomU and the output you have requested .
>> Performance disk are all my machines the most serious problem , even if they are used powerful hardware .
>> Differences in Disk writing in DomU are 1/3 of those of the Dom0 .
>>
>>
>> Thank you in advance Luca
>>
>>
>>
>>
>>
>>
>>
>> Il 05/01/2016 12:09, Stefano Stabellini ha scritto:
>>
>> Could you please post your VM config file and the output of
>> xenstore-ls once the VM has completed the boot sequence?
>>
>> On Tue, 5 Jan 2016, Luca Tongiani wrote:
>>
>> Hi Stefano,
>> im writing to you because im having issue with I/O disk in my DomU With Xen (Gentoo based system).
>>
>> I tried to use the driver that you provided for the PV .
>> But the results are still not good , there is no way to support the use of Xen VirtIO disk ? Many thanks in
>> advance
>>
>> Luca
>>
>> Il 12/16/15 12:31, Stefano Stabellini ha scritto:
>>
>> Hello Luca,
>>
>> the recommended way to increase disk performance would be to use Xen PV
>> disks. You just need to install the Windows PV drivers:
>>
>> http://www.xenproject.org/developers/teams/windows-pv-drivers.html
>>
>> But using VirtIO disk should also increase performance, even though
>> most probably not as much.
>>
>> Cheers,
>>
>> Stefano
>>
>> On Tue, 15 Dec 2015, Luca Tongiani wrote:
>>
>> Hi to all,
>> I'm writing you this mail for asking some advice about a great problem i'm havin in running a Windows VM
>> (HVM) onto a Xen (Gentoo based) Hypevisor.
>>
>> I need to achieve maximum performance from this VM because of intense SQL tasks running in it.
>>
>> I've seen good improvement in IO on disk using VirtIO on a Windows VM onto a QEMU (QNAP) hypervisor, and i'm
>> tryin to use this feature also on my Xen HV.
>> Is VirtIO disk a good way to improve performance?
>>
>> Thx in advance and hope to keep in touch
>> --
>>
>> Luca Tongiani
>>
>> Sinte srl
>> Soluzioni Informatiche e Telematiche
>> via Monte Grappa 4/B
>> 20900 Monza (MB)
>>
>> Cel (+39) 339 745 49 21
>> Tel (+39) 039 200 59 60
>> Fax (+39) 039 200 69 42
>> Web www.sinte.net
>>
>>
>>
>>
>> --
>>
>> Luca Tongiani
>>
>> Sinte srl
>> Soluzioni Informatiche e Telematiche
>> via Monte Grappa 4/B
>> 20900 Monza (MB)
>>
>> Tel (+39) 039 200 59 60
>> Fax (+39) 039 200 69 42
>> Web www.sinte.net
>>
>>
>>
>>
>> --
>>
>> Luca Tongiani
>>
>> Sinte srl
>> Soluzioni Informatiche e Telematiche
>> via Monte Grappa 4/B
>> 20900 Monza (MB)
>>
>> Tel (+39) 039 200 59 60
>> Fax (+39) 039 200 69 42
>> Web www.sinte.net
>>
>>
>>
>>
>> --
>>
>> Luca Tongiani
>>
>> Sinte srl
>> Soluzioni Informatiche e Telematiche
>> via Monte Grappa 4/B
>> 20900 Monza (MB)
>>
>> Tel (+39) 039 200 59 60
>> Fax (+39) 039 200 69 42
>> Web www.sinte.net
>>
>>
>>
--
*Luca Tongiani*
*Sinte* srl
Soluzioni Informatiche e Telematiche
via Monte Grappa 4/B
20900 Monza (MB)
*Tel* (+39) 039 200 59 60
*Fax* (+39) 039 200 69 42
*Web* www.sinte.net <http://www.sinte.net/>
[-- Attachment #1.2: Type: text/html, Size: 6514 bytes --]
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_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xen.org
http://lists.xen.org/xen-devel
^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: Question about VirtIO on Xen - Disk performance issues
2016-01-05 14:44 ` Luca Tongiani
@ 2016-01-05 17:24 ` Stefano Stabellini
0 siblings, 0 replies; 12+ messages in thread
From: Stefano Stabellini @ 2016-01-05 17:24 UTC (permalink / raw)
To: Luca Tongiani; +Cc: xen-devel, Stefano Stabellini
http://wiki.xenproject.org/ has a lot of useful info.
You can achieve better disk performance by using raw LVM volumes and
using phy: in the disk config line.
On Tue, 5 Jan 2016, Luca Tongiani wrote:
> Hi,
> Thanks for the hints , I did experiment with the changes you suggested and now we were able to achieve the
> following result : the performance of the domU is 50 % of the dom0 .
>
> Is it possible to improve these numbers more ?
>
> Also , do you have any advice on where to find extensive documentation on how to use Xen ?
>
> Thank you
>
> Luca
>
> Il 05/01/2016 15:05, Stefano Stabellini ha scritto:
>
> There are a few issues in the config files. In conf_DomU_WindowsHVM:
>
> - device_model is set to /usr/lib64/xen/bin/qemu-dm, which is the old
> qemu-xen-traditional device model, known to have worse disk
> performance. Just delete this line to use the newer QEMU based tree.
> - disk is set to [ '/dev/vg0/winvirtio,raw,xvda1,rw' ], but you cannot
> expose only a partition of a disk to a Windows HVM domain. The correct
> disk line would be: disk = [ '/dev/vg0/winvirtio,raw,hda,rw' ]
>
> In conf_DomU_Xen:
>
> - you are missing builder="hvm", which means you are using a PV guest
> rather than an HVM guest. PV guests tends to be slower on new
> hardware.
>
> What version of Xen are you using?
>
>
> On Tue, 5 Jan 2016, Luca Tongiani wrote:
>
> Sorry but I sent these logs because I have no longer available the Virtualizer of Windows DomU .
> In any case the problem of the performance of disks is present both in the case of Linux machines PV and Windows
> machines HVM .
> I attach the complete log of the server and the conf of my HVM Windows Machine.
>
> Thanks again
>
>
> Il 05/01/2016 13:42, Stefano Stabellini ha scritto:
>
> The xenstore-ls output is not complete. Could you please send it again?
>
> I noticed from the DomU config file that it is not a Windows VM, as
> previously discussed, but a Linux VM. That is OK, but of course in that
> case you won't be able to use the Windows PV drivers which I linked.
> Linux has its own set of drivers. Did you enable the Xen PV frontends in
> the Linux kernel you use (/var/xen/boot/vmlinuz-4.0.5-gentoo_bmsbackup)?
> Did you compile them a built-in or as modules?
>
> On Tue, 5 Jan 2016, Luca Tongiani wrote:
>
> Hi,
> thanks in advance for your reply :)
>
>
> I have attached the following email configuration DomU and the output you have requested .
> Performance disk are all my machines the most serious problem , even if they are used powerful hardware .
> Differences in Disk writing in DomU are 1/3 of those of the Dom0 .
>
>
> Thank you in advance Luca
>
>
>
>
>
>
>
> Il 05/01/2016 12:09, Stefano Stabellini ha scritto:
>
> Could you please post your VM config file and the output of
> xenstore-ls once the VM has completed the boot sequence?
>
> On Tue, 5 Jan 2016, Luca Tongiani wrote:
>
> Hi Stefano,
> im writing to you because im having issue with I/O disk in my DomU With Xen (Gentoo based system).
>
> I tried to use the driver that you provided for the PV .
> But the results are still not good , there is no way to support the use of Xen VirtIO disk ? Many thanks in
> advance
>
> Luca
>
> Il 12/16/15 12:31, Stefano Stabellini ha scritto:
>
> Hello Luca,
>
> the recommended way to increase disk performance would be to use Xen PV
> disks. You just need to install the Windows PV drivers:
>
> http://www.xenproject.org/developers/teams/windows-pv-drivers.html
>
> But using VirtIO disk should also increase performance, even though
> most probably not as much.
>
> Cheers,
>
> Stefano
>
> On Tue, 15 Dec 2015, Luca Tongiani wrote:
>
> Hi to all,
> I'm writing you this mail for asking some advice about a great problem i'm havin in running a Windows VM
> (HVM) onto a Xen (Gentoo based) Hypevisor.
>
> I need to achieve maximum performance from this VM because of intense SQL tasks running in it.
>
> I've seen good improvement in IO on disk using VirtIO on a Windows VM onto a QEMU (QNAP) hypervisor, and i'm
> tryin to use this feature also on my Xen HV.
> Is VirtIO disk a good way to improve performance?
>
> Thx in advance and hope to keep in touch
> --
>
> Luca Tongiani
>
> Sinte srl
> Soluzioni Informatiche e Telematiche
> via Monte Grappa 4/B
> 20900 Monza (MB)
>
> Cel (+39) 339 745 49 21
> Tel (+39) 039 200 59 60
> Fax (+39) 039 200 69 42
> Web www.sinte.net
>
>
>
>
> --
>
> Luca Tongiani
>
> Sinte srl
> Soluzioni Informatiche e Telematiche
> via Monte Grappa 4/B
> 20900 Monza (MB)
>
> Tel (+39) 039 200 59 60
> Fax (+39) 039 200 69 42
> Web www.sinte.net
>
>
>
>
> --
>
> Luca Tongiani
>
> Sinte srl
> Soluzioni Informatiche e Telematiche
> via Monte Grappa 4/B
> 20900 Monza (MB)
>
> Tel (+39) 039 200 59 60
> Fax (+39) 039 200 69 42
> Web www.sinte.net
>
>
>
>
> --
>
> Luca Tongiani
>
> Sinte srl
> Soluzioni Informatiche e Telematiche
> via Monte Grappa 4/B
> 20900 Monza (MB)
>
> Tel (+39) 039 200 59 60
> Fax (+39) 039 200 69 42
> Web www.sinte.net
>
>
>
>
> --
>
> Luca Tongiani
>
> Sinte srl
> Soluzioni Informatiche e Telematiche
> via Monte Grappa 4/B
> 20900 Monza (MB)
>
> Tel (+39) 039 200 59 60
> Fax (+39) 039 200 69 42
> Web www.sinte.net
>
>
>
^ permalink raw reply [flat|nested] 12+ messages in thread
end of thread, other threads:[~2016-01-05 17:24 UTC | newest]
Thread overview: 12+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2015-12-15 13:09 Question about VirtIO on Xen - Disk performance issues Luca Tongiani
2015-12-15 15:34 ` Ian Campbell
2015-12-16 11:31 ` Stefano Stabellini
2016-01-05 10:53 ` Luca Tongiani
2016-01-05 11:09 ` Stefano Stabellini
2016-01-05 12:22 ` Luca Tongiani
2016-01-05 12:42 ` Stefano Stabellini
2016-01-05 13:52 ` Luca Tongiani
2016-01-05 14:05 ` Stefano Stabellini
2016-01-05 14:44 ` Luca Tongiani
2016-01-05 17:24 ` Stefano Stabellini
2016-01-05 14:05 ` Luca Tongiani
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