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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 14:10:33 +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 12:11:26 +0000 |
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> 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'?
I have this line in my DomU conf :
disk = [ 'phy:vg/gentoo-root,hda1,w' ,'phy:vg/gentoo-swap,hda2,w' ]
I make my measurements with :
Dom0 : dd if=/dev/vg/gentoo-root of=/dev/null bs={128|256|...}k
DomU : dd if=/dev/hda1 of=/dev/null bs={128|256|...}k
In all cases I get same results : 50-52 MB/s on Dom0, 34-37 MB/s on DomU
I've tried with any combination of scheduler.
I will try with latest xen-testing hypervisor (I still use 2.0.5 for the
moment) but I don't think this should impact a lot.
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