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

[Cédric Schieli <cedric@xxxxxxxxxxxxxxxxxx>]

> 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.


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