RE: [Xen-devel] get CPU idle time?

["Apparao, Padmashree K" <padmashree.k.apparao@xxxxxxxxx>]

I have found that xenoprof and xentop match. You have to convert the
samples to utilization. Xenoprof does not give util directly. 

Formula:

[(global_power_event_samples)*sample after value]/sample time ==> will
give events/sec
Then divide this by the clock freq (cpu freq in cycles/sec) that will
give you the cpu util.
Global_power_events per sec / Cycles per sec = utilization

Hope this helps
Thanks
- Padma





-----Original Message-----
From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
[mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Rob Gardner
Sent: Wednesday, July 12, 2006 1:04 PM
To: David Carr
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-devel] get CPU idle time?

David Carr wrote:
> Whats the best way to get the CPU idle time on xen?  I just want to
know
> the idle time for the physical CPU.  I'm getting differing results
between
> xenoprof and xentop (modified to add up all the domains).  Is there
> something I can trust?

Xenmon reports cpu idle time directly. Give it a try and see if it's 
trustworthy.

Rob



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