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

[Cédric Schieli <cedric@xxxxxxxxxxxxxxxxxx>]

> 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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