From: Anthony Liguori <anthony-rdkfGonbjUSkNkDKm+mE6A@public.gmane.org>
To: Omar Khan <okhan-e94Sedi4moU@public.gmane.org>
Cc: kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
Subject: Re: vmcall time
Date: Sat, 10 Mar 2007 17:22:31 -0600 [thread overview]
Message-ID: <45F33DB7.8090907@codemonkey.ws> (raw)
In-Reply-To: <loom.20070310T230225-387-eS7Uydv5nfjZ+VzJOa5vwg@public.gmane.org>
Omar Khan wrote:
> hi,
>
> What is an easy way to approximately measure the time it takes to make a
> vmcall? If I make let us say 100,000 vmcalls from the guest os and print jiffies
> in kvm for the first and last call would that do the job?
>
There is currently a test in virtbench that will measure PIO time. That
is going to be a fair bit higher than vmcall but definitely within the
right ballpark.
I've got a patch that should appear in virtbench soon that actually
measures vmcall latency.
http://ozlabs.org/~rusty/virtbench
Regards,
Anthony Liguori
> Thanks
>
> Omar
>
>
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next prev parent reply other threads:[~2007-03-10 23:22 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-03-10 22:05 vmcall time Omar Khan
[not found] ` <loom.20070310T230225-387-eS7Uydv5nfjZ+VzJOa5vwg@public.gmane.org>
2007-03-10 23:22 ` Anthony Liguori [this message]
2007-03-11 11:58 ` Omar Khan
[not found] ` <loom.20070311T125427-987-eS7Uydv5nfjZ+VzJOa5vwg@public.gmane.org>
2007-03-11 17:02 ` Anthony Liguori
[not found] ` <45F43631.3060703-rdkfGonbjUSkNkDKm+mE6A@public.gmane.org>
2007-03-11 17:25 ` Dor Laor
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