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xen-devel
RE: [Xen-devel] poor domU VBD performance.
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To: |
Cédric Schieli <cedric@xxxxxxxxxxxxxxxxxx> |
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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 11:56:30 +0100 |
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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 10:56:35 +0000 |
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Thread-index: |
AcU3cG3d3Xr26wXuQDmX1G8ec3iaiwAANa7Q |
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Thread-topic: |
[Xen-devel] poor domU VBD performance. |
> > > 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.
Are you sure you're reading from the exact same part of the disk in both
instances?
How are you doing the bandwidth measurements? 'dd'?
Ian
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