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

  • To: Gianluca Guida <gianluca.guida@xxxxxxxxxxxxx>
  • From: Juergen Gross <juergen.gross@xxxxxxxxxxxxxx>
  • Date: Wed, 14 Oct 2009 13:43:45 +0200
  • Cc: "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • Delivery-date: Wed, 14 Oct 2009 04:44:11 -0700
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Gianluca Guida wrote:
> 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?

Not yet. I wanted to be sure, as I suspected some inconsistencies could be
hiding without showing up at once.


Juergen Gross                 Principal Developer Operating Systems
TSP ES&S SWE OS6                       Telephone: +49 (0) 89 636 47950
Fujitsu Technolgy Solutions               e-mail: juergen.gross@xxxxxxxxxxxxxx
Otto-Hahn-Ring 6                        Internet: ts.fujitsu.com
D-81739 Muenchen                 Company details: ts.fujitsu.com/imprint.html

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