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

[Cédric Schieli <cedric@xxxxxxxxxxxxxxxxxx>]

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

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel