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xen-devel
RE: [Xen-devel] poor domU VBD performance.
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To: |
Cédric Schieli <cedric@xxxxxxxxxxxxxxxxxx>, "Andrew Theurer" <habanero@xxxxxxxxxx> |
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Subject: |
RE: [Xen-devel] poor domU VBD performance. |
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From: |
"Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx> |
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Date: |
Sat, 2 Apr 2005 00:22:17 +0100 |
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Cc: |
Xen development list <xen-devel@xxxxxxxxxxxxxxxxxxx>, Kurt Garloff <garloff@xxxxxxx>, Philip R Auld <pauld@xxxxxxxxxxx>, Vincent Hanquez <tab@xxxxxxxxx>, Jens Axboe <axboe@xxxxxxx>, Christian Limpach <Christian.Limpach@xxxxxxxxxxxx> |
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Fri, 01 Apr 2005 23:22:22 +0000 |
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Thread-topic: |
[Xen-devel] poor domU VBD performance. |
There have been some changes to the frontend driver too: you might want to try
using the 2.0-testing kernel in domU too.
Also, a really nasty CPU performance bug got fixed earlier this evening, so you
should make sure you have the latest tree.
Ian
> > I just ran again, and for some reason it looks fine now...
> I have no
> > idea what I did to get the lower numbers initially, perhaps an
> > inadvertant IO scheduler change. Service commit times are
> .28ms and I
> > can drive ~58MB/sec with just 16k requests on xen0. I'll
> do some more
> > tests to get a more consistent picture.
> >
>
> I still experience bad performance in domU with latest
> xen-testing dom0.
>
> Here's my setup :
>
> Xen : 2.0.5
> Dom0 : 2.6.11-xen-testing (20050401 ~22h CEST) running Debian
> Sarge DomU : 2.6.10-xen-2.0.5 (8G LVM backed VBDs exported as
> hda1) running Gentoo Processor : AthlonXP 1800+ Chipset : VIA
> KT600 Drive : Seagate ST380013AS 80G SATA
>
> And my results :
>
> Dom0 : 51 MB/s
> DomU : 36 MB/s
>
> I've tried with request sizes from 128k to 1024k reading
> entire volume and obtained always same results.
> Changing the scheduler on Dom0 and/or DomU doesn't change anything.
>
> I can give you more info if nedded.
>
> --
> Cédric Schieli
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-devel
>
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