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xen-devel
Re: [Xen-devel] poor domU VBD performance.
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To: |
Andrew Theurer <habanero@xxxxxxxxxx> |
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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: |
Fri, 01 Apr 2005 23:40:22 +0200 |
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Cc: |
Ian Pratt <m+Ian.Pratt@xxxxxxxxxxxx>, 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 21:41:27 +0000 |
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<200503311705.35693.habanero@xxxxxxxxxx> |
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> 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
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