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xen-devel
RE: [Xen-devel] poor domU VBD performance.
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To: |
Ian Pratt <m+Ian.Pratt@xxxxxxxxxxxx> |
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Subject: |
RE: [Xen-devel] poor domU VBD performance. |
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From: |
Cédric Schieli <cedric@xxxxxxxxxxxxxxxxxx> |
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Date: |
Sat, 02 Apr 2005 12:36:45 +0200 |
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Cc: |
Xen development list <xen-devel@xxxxxxxxxxxxxxxxxxx>, Kurt Garloff <garloff@xxxxxxx>, Andrew Theurer <habanero@xxxxxxxxxx>, Philip R Auld <pauld@xxxxxxxxxxx>, Vincent Hanquez <tab@xxxxxxxxx>, Jens Axboe <axboe@xxxxxxx>, Christian Limpach <Christian.Limpach@xxxxxxxxxxxx> |
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Sat, 02 Apr 2005 10:37:43 +0000 |
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I've just tried with latest testing tree DomO and DomU and got same
results.
Le samedi 02 avril 2005 à 00:22 +0100, Ian Pratt a écrit :
> 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
> >
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-devel
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