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Re: [Xen-devel] Poor performance on HVM (kernbench)


  • To: "Steve Ofsthun" <sofsthun@xxxxxxxxxxxxxxx>
  • From: "Todd Deshane" <deshantm@xxxxxxxxx>
  • Date: Wed, 10 Sep 2008 22:50:29 -0400
  • Cc: Daniel Magenheimer <dan.magenheimer@xxxxxxxxxx>, xen-devel mailing list <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • Delivery-date: Wed, 10 Sep 2008 19:50:53 -0700
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  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>

> I think what Dan is getting at is, the native execution run should restrict
> it's cpu and memory usage to be identical with the guest tests.  So restrict
> the native test cpus with "maxcpus=1" or "nosmp" on the boot line.
>  Similarly you can restrict memory using "mem=xxxM".

Linux kernel (only had a spare Ubuntu 2.6.24) to work with

nosmp  mem=2048M

Average Optimal load -j 4 Run (std deviation):
Elapsed Time 403.744 (0.26857)
User Time 373.23 (0.421485)
System Time 30.32 (0.389551)
Percent CPU 99 (0)
Context Switches 90961.2 (105.838)
Sleeps 52311.8 (83.8373)

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