Re: performance trouble

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On Fri, Feb 17, 2012 at 03:01:07PM +0100, David Cure wrote:
> Le Fri, Feb 17, 2012 at 12:07:14PM +0200, Gleb Natapov ecrivait :
> > 
> > > > Can you do the trace again with -no-hpet on the command line?
> > > 
> > > 	Is there a way to only trace events on specific VM ?
> > > 
> > -P pid
> 
> 	ok. I take a trace of the VM with 1 user : start trace just
> before to launch slowly function and stop trace just after the function
> finish.
> 	the report is available here
> http://www.roullier.net/report-no-hpet.txt.gz
> 
How have you acquired this trace? It does not trace all kvm events only
those that have "set_irq" in them.

> 	I hope you can see something strange,
> 

Nothing particularly strange here. ~1745 IRQs are injected into the
guest each second.  RTC clock is configured to 1kH and other devices
contribute ~721 irqs (MSI mostly) per second more. Hardly unusual.

--
			Gleb.
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