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

[Andrew Theurer <habanero@xxxxxxxxxx>]

On Monday 28 March 2005 12:55, Ian Pratt wrote:
> > > I found out that dom0 does file-system IO and raw IO ( using
> > > dd as a tool to test
> > > throughput from the disk ) is about exactly the same as when
> > > using a standard
> > > linux kernel without XEN. But the raw IO from DomU to an
> > > unused disk ( a second
> > > disk in the system ) is limited to fourty percent of the
> > > speed I get within Dom0.

Is the second disk exactly the same as the first one?  I'll try an IO test 
here on the same disk array with dom0 and domU and see what I get.

-Andrew
>
> OK, this looks like a perofrmance bug that's crept into the 2.6 dom0
> some where along the way. I'm surprised no-one else has spotted it.
>
> Please can you confirm that performance is OK if you use 2.4 as a dom0?
> (It doesn't matter what you use as guests).
>
>
> Thanks,
> Ian
>
> _______________________________________________
> 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