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

To:	"Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>, "Peter Bier" <peter_bier@xxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject:	RE: [Xen-devel] poor domU VBD performance.
From:	"Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>
Date:	Mon, 28 Mar 2005 19:55:18 +0100
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> > 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.

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

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