Re: [Xen-users] GPLPV drivers and Windows 2008

[Matthieu Patou <mat+Informatique.xen@xxxxxxxxx>]

I retransmit on the list because I forgot to ...
On 10.10.2008 03:16, James Harper wrote:
> > Hello all,
> >
> > I have been testing a Windows 2008 server on xen 3.2-1 (from debian
> > backports) on etch and I got very bad perf with GPLPV drivers with
> disks
> > (I can't get more than 3/5 Mo/s).
> >
> > I am quite sure that I have drivers enabled because device manager
> show
> > them and report them as working correctly.
> > The difference between a normal installation and my Xen one is that I
> do
> > not have access to write caching optimization (the option "Enable
> write
> > caching on the disk" is not present at all).
> The 'write caching' is presumably Windows responding to a feature
> reported by the disk. As my drivers don't cache anything anyway, even if
> I reported it as available it wouldn't actually do anything.
>
> > Is there something I should do ?
> > I am running 0.9.11pre17 GPLPV drivers.
> Can you tell me how you are measuring performance?
With iozone, in fact it's more 6/7Mo but still it's not gorgeous, I was 
able to check the result with the ressource monitor and with iostat 
(running in dom0 while iozone was running).
Cheers.
Matthieu

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