* Benchmarking warning
@ 2008-01-25 22:20 Cam Macdonell
[not found] ` <479A60B3.9040200-edFDblaTWIyXbbII50Afww@public.gmane.org>
0 siblings, 1 reply; 2+ messages in thread
From: Cam Macdonell @ 2008-01-25 22:20 UTC (permalink / raw)
To: kvm-devel
Hi,
I get the following warning in the kernel messages:
kvm: emulating preempt notifiers; do not benchmark on this machine
Is this an accurate warning, should the machine not be used for
benchmarking KVM? or does it mean don't benchmark other applications on
the host?
Thanks,
Cam
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* Re: Benchmarking warning
[not found] ` <479A60B3.9040200-edFDblaTWIyXbbII50Afww@public.gmane.org>
@ 2008-01-25 23:42 ` Dor Laor
0 siblings, 0 replies; 2+ messages in thread
From: Dor Laor @ 2008-01-25 23:42 UTC (permalink / raw)
To: Cam Macdonell; +Cc: kvm-devel
On Fri, 2008-01-25 at 15:20 -0700, Cam Macdonell wrote:
> Hi,
>
> I get the following warning in the kernel messages:
>
> kvm: emulating preempt notifiers; do not benchmark on this machine
>
> Is this an accurate warning, should the machine not be used for
It's accurate.
> benchmarking KVM? or does it mean don't benchmark other applications on
> the host?
>
It's when running kvm (it traps every process scheduling).
On newer hosts (2.6.23 >=) the preempt notifiers are integrated and
there is no need tapping the scheduler.
> Thanks,
> Cam
>
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2008-01-25 22:20 Benchmarking warning Cam Macdonell
[not found] ` <479A60B3.9040200-edFDblaTWIyXbbII50Afww@public.gmane.org>
2008-01-25 23:42 ` Dor Laor
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