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

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

> > > 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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