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

  • To: George Dunlap <George.Dunlap@xxxxxxxxxxxxx>
  • From: Juergen Gross <juergen.gross@xxxxxxxxxxxxxx>
  • Date: Wed, 07 Oct 2009 13:45:27 +0200
  • Cc: Ian Pratt <Ian.Pratt@xxxxxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Tim Deegan <Tim.Deegan@xxxxxxxxxx>, James Harper <james.harper@xxxxxxxxxxxxxxxx>
  • Delivery-date: Wed, 07 Oct 2009 04:45:54 -0700
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George Dunlap wrote:
> Jeurgen,
> I think this problem is a good candidate for xentrace/xenalyze.  If
> you take a 30-second trace (xentrace -D -e all -T 30
> /tmp/[traceid].trace) while the benchmark is at its heaviest, and then
> analyze it using xenalyze
> (http://xenbits.xensource.com/ext/xenalyze.hg), it should show up
> whether the shadow performance is due to brute-force search or
> something else.
> If you're using 3.3, you'll have to apply the back-patch to xenalyze
> to make it work properly.

Patches don't apply cleanly, build fails with error even without patches due
to incorrect format strings.


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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