* HVM dropped packets
@ 2009-08-25 18:30 Nathan Stratton
2009-08-25 19:10 ` Pasi Kärkkäinen
0 siblings, 1 reply; 9+ messages in thread
From: Nathan Stratton @ 2009-08-25 18:30 UTC (permalink / raw)
To: Xen-devel
I am having no issues with para guests, but HVM guests all show dropped
packets.
I am runing Xen 3.4.1 on linux 2.6.31-rc6, but also have tried older xen
and kernels.
Also, not sure why I have a vif and a tap for my HVM guests, only have vif
for para.
[root@xen1 config]# ifconfig tap19.0
tap19.0 Link encap:Ethernet HWaddr B6:B7:E1:71:09:3C
inet6 addr: fe80::b4b7:e1ff:fe71:93c/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:34507 errors:0 dropped:0 overruns:0 frame:0
TX packets:43841 errors:0 dropped:0 overruns:645 carrier:0
collisions:0 txqueuelen:500
RX bytes:16847714 (16.0 MiB) TX bytes:22711872 (21.6 MiB)
[root@xen1 config]# ifconfig tap19.1
tap19.1 Link encap:Ethernet HWaddr 76:C7:74:AF:CA:EC
inet6 addr: fe80::74c7:74ff:feaf:caec/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:36601 errors:0 dropped:0 overruns:0 frame:0
TX packets:36018 errors:0 dropped:0 overruns:457 carrier:0
collisions:0 txqueuelen:500
RX bytes:18152679 (17.3 MiB) TX bytes:17744980 (16.9 MiB)
[root@xen1 config]# ifconfig vif19.0
vif19.0 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF
inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:2908 overruns:0 carrier:0
collisions:0 txqueuelen:32
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
[root@xen1 config]# ifconfig vif19.1
vif19.1 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF
inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:181 overruns:0 carrier:0
collisions:0 txqueuelen:32
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
[root@xen1 config]# more proxy0.hou-para
import os, re
arch = os.uname()[4]
if re.search('64', arch):
arch_libdir = 'lib64'
else:
arch_libdir = 'lib'
kernel = "/usr/lib/xen/boot/hvmloader"
builder='hvm'
name = "proxy0.hou"
memory = 2048
vcpus=4
disk = [ 'file:/share/xen/images/proxy0.hou.img,xvda,w', ]
vif = [ 'mac=00:11:25:00:1E:01, type=ioemu, bridge=private',
'mac=00:11:25:00:1E:02, type=ioemu, bridge=public' ]
uuid = '00000014-1111-2222-3333-200809231904'
device_model = '/usr/' + arch_libdir + '/xen/bin/qemu-dm'
sdl=0
opengl=1
vnc=1
vncpasswd=''
stdvga=0
serial='pty'
><>
Nathan Stratton CTO, BlinkMind, Inc.
nathan at robotics.net nathan at blinkmind.com
http://www.robotics.net http://www.blinkmind.com
^ permalink raw reply [flat|nested] 9+ messages in thread* Re: HVM dropped packets
2009-08-25 18:30 HVM dropped packets Nathan Stratton
@ 2009-08-25 19:10 ` Pasi Kärkkäinen
2009-08-25 19:49 ` Nathan Stratton
0 siblings, 1 reply; 9+ messages in thread
From: Pasi Kärkkäinen @ 2009-08-25 19:10 UTC (permalink / raw)
To: Nathan Stratton; +Cc: Xen-devel
On Tue, Aug 25, 2009 at 01:30:34PM -0500, Nathan Stratton wrote:
>
> I am having no issues with para guests, but HVM guests all show dropped
> packets.
>
Try changing the Qemu emulated NIC to Intel e1000. Maybe that helps with the
performance.
Or then use PV drivers in the guest.
-- Pasi
> I am runing Xen 3.4.1 on linux 2.6.31-rc6, but also have tried older xen
> and kernels.
>
> Also, not sure why I have a vif and a tap for my HVM guests, only have vif
> for para.
>
> [root@xen1 config]# ifconfig tap19.0
> tap19.0 Link encap:Ethernet HWaddr B6:B7:E1:71:09:3C
> inet6 addr: fe80::b4b7:e1ff:fe71:93c/64 Scope:Link
> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
> RX packets:34507 errors:0 dropped:0 overruns:0 frame:0
> TX packets:43841 errors:0 dropped:0 overruns:645 carrier:0
> collisions:0 txqueuelen:500
> RX bytes:16847714 (16.0 MiB) TX bytes:22711872 (21.6 MiB)
>
> [root@xen1 config]# ifconfig tap19.1
> tap19.1 Link encap:Ethernet HWaddr 76:C7:74:AF:CA:EC
> inet6 addr: fe80::74c7:74ff:feaf:caec/64 Scope:Link
> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
> RX packets:36601 errors:0 dropped:0 overruns:0 frame:0
> TX packets:36018 errors:0 dropped:0 overruns:457 carrier:0
> collisions:0 txqueuelen:500
> RX bytes:18152679 (17.3 MiB) TX bytes:17744980 (16.9 MiB)
>
> [root@xen1 config]# ifconfig vif19.0
> vif19.0 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF
> inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
> UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1
> RX packets:0 errors:0 dropped:0 overruns:0 frame:0
> TX packets:0 errors:0 dropped:2908 overruns:0 carrier:0
> collisions:0 txqueuelen:32
> RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
>
> [root@xen1 config]# ifconfig vif19.1
> vif19.1 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF
> inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
> UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1
> RX packets:0 errors:0 dropped:0 overruns:0 frame:0
> TX packets:0 errors:0 dropped:181 overruns:0 carrier:0
> collisions:0 txqueuelen:32
> RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
>
>
> [root@xen1 config]# more proxy0.hou-para
> import os, re
> arch = os.uname()[4]
> if re.search('64', arch):
> arch_libdir = 'lib64'
> else:
> arch_libdir = 'lib'
>
> kernel = "/usr/lib/xen/boot/hvmloader"
>
> builder='hvm'
>
> name = "proxy0.hou"
> memory = 2048
> vcpus=4
>
> disk = [ 'file:/share/xen/images/proxy0.hou.img,xvda,w', ]
> vif = [ 'mac=00:11:25:00:1E:01, type=ioemu, bridge=private',
> 'mac=00:11:25:00:1E:02, type=ioemu, bridge=public' ]
>
> uuid = '00000014-1111-2222-3333-200809231904'
>
> device_model = '/usr/' + arch_libdir + '/xen/bin/qemu-dm'
>
> sdl=0
> opengl=1
> vnc=1
> vncpasswd=''
> stdvga=0
> serial='pty'
>
>
>
> ><>
> Nathan Stratton CTO, BlinkMind, Inc.
> nathan at robotics.net nathan at blinkmind.com
> http://www.robotics.net http://www.blinkmind.com
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xensource.com
> http://lists.xensource.com/xen-devel
^ permalink raw reply [flat|nested] 9+ messages in thread* Re: HVM dropped packets
2009-08-25 19:10 ` Pasi Kärkkäinen
@ 2009-08-25 19:49 ` Nathan Stratton
2009-08-25 20:16 ` Pasi Kärkkäinen
0 siblings, 1 reply; 9+ messages in thread
From: Nathan Stratton @ 2009-08-25 19:49 UTC (permalink / raw)
To: Pasi Kärkkäinen; +Cc: Xen-devel
[-- Attachment #1: Type: TEXT/PLAIN, Size: 3686 bytes --]
On Tue, 25 Aug 2009, Pasi Kärkkäinen wrote:
> On Tue, Aug 25, 2009 at 01:30:34PM -0500, Nathan Stratton wrote:
>>
>> I am having no issues with para guests, but HVM guests all show dropped
>> packets.
>
> Try changing the Qemu emulated NIC to Intel e1000. Maybe that helps with the
> performance.
Same
> Or then use PV drivers in the guest.
Can't, its a HVM guest that I don't have control over.
> -- Pasi
>
>> I am runing Xen 3.4.1 on linux 2.6.31-rc6, but also have tried older xen
>> and kernels.
>>
>> Also, not sure why I have a vif and a tap for my HVM guests, only have vif
>> for para.
>>
>> [root@xen1 config]# ifconfig tap19.0
>> tap19.0 Link encap:Ethernet HWaddr B6:B7:E1:71:09:3C
>> inet6 addr: fe80::b4b7:e1ff:fe71:93c/64 Scope:Link
>> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
>> RX packets:34507 errors:0 dropped:0 overruns:0 frame:0
>> TX packets:43841 errors:0 dropped:0 overruns:645 carrier:0
>> collisions:0 txqueuelen:500
>> RX bytes:16847714 (16.0 MiB) TX bytes:22711872 (21.6 MiB)
>>
>> [root@xen1 config]# ifconfig tap19.1
>> tap19.1 Link encap:Ethernet HWaddr 76:C7:74:AF:CA:EC
>> inet6 addr: fe80::74c7:74ff:feaf:caec/64 Scope:Link
>> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
>> RX packets:36601 errors:0 dropped:0 overruns:0 frame:0
>> TX packets:36018 errors:0 dropped:0 overruns:457 carrier:0
>> collisions:0 txqueuelen:500
>> RX bytes:18152679 (17.3 MiB) TX bytes:17744980 (16.9 MiB)
>>
>> [root@xen1 config]# ifconfig vif19.0
>> vif19.0 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF
>> inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
>> UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1
>> RX packets:0 errors:0 dropped:0 overruns:0 frame:0
>> TX packets:0 errors:0 dropped:2908 overruns:0 carrier:0
>> collisions:0 txqueuelen:32
>> RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
>>
>> [root@xen1 config]# ifconfig vif19.1
>> vif19.1 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF
>> inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
>> UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1
>> RX packets:0 errors:0 dropped:0 overruns:0 frame:0
>> TX packets:0 errors:0 dropped:181 overruns:0 carrier:0
>> collisions:0 txqueuelen:32
>> RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
>>
>>
>> [root@xen1 config]# more proxy0.hou-para
>> import os, re
>> arch = os.uname()[4]
>> if re.search('64', arch):
>> arch_libdir = 'lib64'
>> else:
>> arch_libdir = 'lib'
>>
>> kernel = "/usr/lib/xen/boot/hvmloader"
>>
>> builder='hvm'
>>
>> name = "proxy0.hou"
>> memory = 2048
>> vcpus=4
>>
>> disk = [ 'file:/share/xen/images/proxy0.hou.img,xvda,w', ]
>> vif = [ 'mac=00:11:25:00:1E:01, type=ioemu, bridge=private',
>> 'mac=00:11:25:00:1E:02, type=ioemu, bridge=public' ]
>>
>> uuid = '00000014-1111-2222-3333-200809231904'
>>
>> device_model = '/usr/' + arch_libdir + '/xen/bin/qemu-dm'
>>
>> sdl=0
>> opengl=1
>> vnc=1
>> vncpasswd=''
>> stdvga=0
>> serial='pty'
>>
>>
>>
>>> <>
>> Nathan Stratton CTO, BlinkMind, Inc.
>> nathan at robotics.net nathan at blinkmind.com
>> http://www.robotics.net http://www.blinkmind.com
>>
>> _______________________________________________
>> Xen-devel mailing list
>> Xen-devel@lists.xensource.com
>> http://lists.xensource.com/xen-devel
>
[-- Attachment #2: Type: text/plain, Size: 138 bytes --]
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xensource.com
http://lists.xensource.com/xen-devel
^ permalink raw reply [flat|nested] 9+ messages in thread* Re: HVM dropped packets
2009-08-25 19:49 ` Nathan Stratton
@ 2009-08-25 20:16 ` Pasi Kärkkäinen
2009-08-25 20:52 ` Nathan Stratton
0 siblings, 1 reply; 9+ messages in thread
From: Pasi Kärkkäinen @ 2009-08-25 20:16 UTC (permalink / raw)
To: Nathan Stratton; +Cc: Xen-devel
On Tue, Aug 25, 2009 at 02:49:40PM -0500, Nathan Stratton wrote:
> On Tue, 25 Aug 2009, Pasi Kärkkäinen wrote:
>
> >On Tue, Aug 25, 2009 at 01:30:34PM -0500, Nathan Stratton wrote:
> >>
> >>I am having no issues with para guests, but HVM guests all show dropped
> >>packets.
> >
> >Try changing the Qemu emulated NIC to Intel e1000. Maybe that helps with
> >the
> >performance.
>
> Same
>
> >Or then use PV drivers in the guest.
>
> Can't, its a HVM guest that I don't have control over.
>
Well I guess then your only option is to use stubdoms.
Beware there's a bug (qemu memleak) in xen 3.4.1 related to stubdoms and heavy io
on hvm guests in general: http://lists.xensource.com/archives/html/xen-devel/2009-08/msg00335.html
-- Pasi
> >-- Pasi
> >
> >>I am runing Xen 3.4.1 on linux 2.6.31-rc6, but also have tried older xen
> >>and kernels.
> >>
> >>Also, not sure why I have a vif and a tap for my HVM guests, only have vif
> >>for para.
> >>
> >>[root@xen1 config]# ifconfig tap19.0
> >>tap19.0 Link encap:Ethernet HWaddr B6:B7:E1:71:09:3C
> >> inet6 addr: fe80::b4b7:e1ff:fe71:93c/64 Scope:Link
> >> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
> >> RX packets:34507 errors:0 dropped:0 overruns:0 frame:0
> >> TX packets:43841 errors:0 dropped:0 overruns:645 carrier:0
> >> collisions:0 txqueuelen:500
> >> RX bytes:16847714 (16.0 MiB) TX bytes:22711872 (21.6 MiB)
> >>
> >>[root@xen1 config]# ifconfig tap19.1
> >>tap19.1 Link encap:Ethernet HWaddr 76:C7:74:AF:CA:EC
> >> inet6 addr: fe80::74c7:74ff:feaf:caec/64 Scope:Link
> >> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
> >> RX packets:36601 errors:0 dropped:0 overruns:0 frame:0
> >> TX packets:36018 errors:0 dropped:0 overruns:457 carrier:0
> >> collisions:0 txqueuelen:500
> >> RX bytes:18152679 (17.3 MiB) TX bytes:17744980 (16.9 MiB)
> >>
> >>[root@xen1 config]# ifconfig vif19.0
> >>vif19.0 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF
> >> inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
> >> UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1
> >> RX packets:0 errors:0 dropped:0 overruns:0 frame:0
> >> TX packets:0 errors:0 dropped:2908 overruns:0 carrier:0
> >> collisions:0 txqueuelen:32
> >> RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
> >>
> >>[root@xen1 config]# ifconfig vif19.1
> >>vif19.1 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF
> >> inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
> >> UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1
> >> RX packets:0 errors:0 dropped:0 overruns:0 frame:0
> >> TX packets:0 errors:0 dropped:181 overruns:0 carrier:0
> >> collisions:0 txqueuelen:32
> >> RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
> >>
> >>
> >>[root@xen1 config]# more proxy0.hou-para
> >>import os, re
> >>arch = os.uname()[4]
> >>if re.search('64', arch):
> >> arch_libdir = 'lib64'
> >>else:
> >> arch_libdir = 'lib'
> >>
> >>kernel = "/usr/lib/xen/boot/hvmloader"
> >>
> >>builder='hvm'
> >>
> >>name = "proxy0.hou"
> >>memory = 2048
> >>vcpus=4
> >>
> >>disk = [ 'file:/share/xen/images/proxy0.hou.img,xvda,w', ]
> >>vif = [ 'mac=00:11:25:00:1E:01, type=ioemu, bridge=private',
> >> 'mac=00:11:25:00:1E:02, type=ioemu, bridge=public' ]
> >>
> >>uuid = '00000014-1111-2222-3333-200809231904'
> >>
> >>device_model = '/usr/' + arch_libdir + '/xen/bin/qemu-dm'
> >>
> >>sdl=0
> >>opengl=1
> >>vnc=1
> >>vncpasswd=''
> >>stdvga=0
> >>serial='pty'
> >>
> >>
> >>
> >>><>
> >>Nathan Stratton CTO, BlinkMind, Inc.
> >>nathan at robotics.net nathan at blinkmind.com
> >>http://www.robotics.net http://www.blinkmind.com
> >>
> >>_______________________________________________
> >>Xen-devel mailing list
> >>Xen-devel@lists.xensource.com
> >>http://lists.xensource.com/xen-devel
> >
^ permalink raw reply [flat|nested] 9+ messages in thread* Re: HVM dropped packets
2009-08-25 20:16 ` Pasi Kärkkäinen
@ 2009-08-25 20:52 ` Nathan Stratton
2009-08-26 5:52 ` Pasi Kärkkäinen
0 siblings, 1 reply; 9+ messages in thread
From: Nathan Stratton @ 2009-08-25 20:52 UTC (permalink / raw)
To: Pasi Kärkkäinen; +Cc: Xen-devel
[-- Attachment #1: Type: TEXT/PLAIN, Size: 442 bytes --]
On Tue, 25 Aug 2009, Pasi Kärkkäinen wrote:
> Well I guess then your only option is to use stubdoms.
Any way to figure out what causes the overruns on tap and drops on vif? If
I am using tap for HVM why is there even a vif?
> Beware there's a bug (qemu memleak) in xen 3.4.1 related to stubdoms and heavy io
> on hvm guests in general: http://lists.xensource.com/archives/html/xen-devel/2009-08/msg00335.html
Thanks.
-Nathan
[-- Attachment #2: Type: text/plain, Size: 138 bytes --]
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xensource.com
http://lists.xensource.com/xen-devel
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: HVM dropped packets
2009-08-25 20:52 ` Nathan Stratton
@ 2009-08-26 5:52 ` Pasi Kärkkäinen
2009-08-26 7:45 ` Nathan Stratton
0 siblings, 1 reply; 9+ messages in thread
From: Pasi Kärkkäinen @ 2009-08-26 5:52 UTC (permalink / raw)
To: Nathan Stratton; +Cc: Xen-devel
On Tue, Aug 25, 2009 at 03:52:23PM -0500, Nathan Stratton wrote:
> On Tue, 25 Aug 2009, Pasi Kärkkäinen wrote:
>
> >Well I guess then your only option is to use stubdoms.
>
> Any way to figure out what causes the overruns on tap and drops on vif? If
> I am using tap for HVM why is there even a vif?
>
How's your CPU usage?
I bet the drops are caused by the low performance of Qemu nic _emulation_.
-- Pasi
> >Beware there's a bug (qemu memleak) in xen 3.4.1 related to stubdoms and
> >heavy io
> >on hvm guests in general:
> >http://lists.xensource.com/archives/html/xen-devel/2009-08/msg00335.html
>
> Thanks.
>
> -Nathan
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: HVM dropped packets
2009-08-26 5:52 ` Pasi Kärkkäinen
@ 2009-08-26 7:45 ` Nathan Stratton
2009-08-26 7:53 ` Keir Fraser
0 siblings, 1 reply; 9+ messages in thread
From: Nathan Stratton @ 2009-08-26 7:45 UTC (permalink / raw)
To: Pasi Kärkkäinen; +Cc: Xen-devel
[-- Attachment #1: Type: TEXT/PLAIN, Size: 244 bytes --]
On Wed, 26 Aug 2009, Pasi Kärkkäinen wrote:
> How's your CPU usage?
Low this is a 8 core Quaid Xeon 5510.
> I bet the drops are caused by the low performance of Qemu nic _emulation_.
Does one emulate better then the rest?
-Nathan
[-- Attachment #2: Type: text/plain, Size: 138 bytes --]
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xensource.com
http://lists.xensource.com/xen-devel
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: HVM dropped packets
2009-08-26 7:45 ` Nathan Stratton
@ 2009-08-26 7:53 ` Keir Fraser
2009-08-26 9:29 ` Stefano Stabellini
0 siblings, 1 reply; 9+ messages in thread
From: Keir Fraser @ 2009-08-26 7:53 UTC (permalink / raw)
To: Nathan Stratton, Pasi Kärkkäinen; +Cc: Xen-devel
On 26/08/2009 08:45, "Nathan Stratton" <nathan@robotics.net> wrote:
>> I bet the drops are caused by the low performance of Qemu nic _emulation_.
>
> Does one emulate better then the rest?
e1000 is probably faster than the rest due to a more efficient hardware
interface better suited to emulation. You may still get receiver overruns
though (which I think was the source of the drops you were seeing?). That's
simply the host receiving packets faster than they can get stuffed through
the emulated interface.
-- Keir
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: HVM dropped packets
2009-08-26 7:53 ` Keir Fraser
@ 2009-08-26 9:29 ` Stefano Stabellini
0 siblings, 0 replies; 9+ messages in thread
From: Stefano Stabellini @ 2009-08-26 9:29 UTC (permalink / raw)
To: Keir Fraser; +Cc: Xen-devel, Nathan Stratton
On Wed, 26 Aug 2009, Keir Fraser wrote:
> On 26/08/2009 08:45, "Nathan Stratton" <nathan@robotics.net> wrote:
>
> >> I bet the drops are caused by the low performance of Qemu nic _emulation_.
> >
> > Does one emulate better then the rest?
>
> e1000 is probably faster than the rest due to a more efficient hardware
> interface better suited to emulation. You may still get receiver overruns
> though (which I think was the source of the drops you were seeing?). That's
> simply the host receiving packets faster than they can get stuffed through
> the emulated interface.
ON this note KVM people stated that the emulated e1000 gives 90% of virtio
performances.
^ permalink raw reply [flat|nested] 9+ messages in thread
end of thread, other threads:[~2009-08-26 9:29 UTC | newest]
Thread overview: 9+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2009-08-25 18:30 HVM dropped packets Nathan Stratton
2009-08-25 19:10 ` Pasi Kärkkäinen
2009-08-25 19:49 ` Nathan Stratton
2009-08-25 20:16 ` Pasi Kärkkäinen
2009-08-25 20:52 ` Nathan Stratton
2009-08-26 5:52 ` Pasi Kärkkäinen
2009-08-26 7:45 ` Nathan Stratton
2009-08-26 7:53 ` Keir Fraser
2009-08-26 9:29 ` Stefano Stabellini
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