Re: [Xen-devel] Poor HVM performance with 8 vcpus

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

On 14/10/2009 09:16, "Juergen Gross" <juergen.gross@xxxxxxxxxxxxxx> wrote:

> as the performance of BS2000 seems to be hit by OOS optimization, I'm
> thinking of making a patch to disable this feature by a domain parameter.
> 
> Is there a way to do this without having to change all places where the
> #if statements are placed?
> I think there should be some central routines where adding an "if" could
> be enough (setting oos_active to 0 seems not to be enough, I fear).
> 
> Do you have any hint?

How about disabling it for domains with more than four VCPUs? Have you
measured performance with OOS for 1-4 VCPU guests? This is perhaps not
something that needs to be baked into guest configs.

 -- Keir



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