RE: [Xen-devel] poor domU VBD performance.

["Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>]

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
> 
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> 

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