Re: [Xen-devel] xen hvm profiling

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

On 05/01/2009 02:42, "James Harper" <james.harper@xxxxxxxxxxxxxxxx> wrote:

> My recent interest in the TPR-write problem has got me thinking about if
> there is any other optimisation that could be done for windows,
> especially as a few people have reported issues with more than a few
> processors, and they say they are already running 2K3sp2 which should
> have TPR optimisation in it already.
> 
> Is there any facility currently for profiling the frequency of vmexit's
> to the hypervisor?

You can use xentrace to get information about the reasons for all vmexits.
Or there are the built-in performance counters (you need to build with
perfc=y to get those). Or you could use xenoprofile.

 -- Keir



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