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

  • To: Juergen Gross <juergen.gross@xxxxxxxxxxxxxx>
  • From: Gianluca Guida <gianluca.guida@xxxxxxxxxxxxx>
  • Date: Wed, 14 Oct 2009 12:35:41 +0100
  • Cc: "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • Delivery-date: Wed, 14 Oct 2009 04:36:05 -0700
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On Wed, Oct 14, 2009 at 9:16 AM, Juergen Gross
<juergen.gross@xxxxxxxxxxxxxx> wrote:
> Gianluca,
> 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).

It should be. oos_active set to zero (if you prevent the shadow code
to set it to 1 when we enable paging) will prevent any page to go OOS.
This is exactly what Tim's suggestion was.

Have you tried it?


It was a type of people I did not know, I found them very strange and
they did not inspire confidence at all. Later I learned that I had been
introduced to electronic engineers.
                                                  E. W. Dijkstra

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