[Fedora-xen] Re: [Libvir] ANNOUNCE: Virt-top - a top-like utility for displaying virtualization stats

[Daniel P. Berrange]

On Mon, Aug 06, 2007 at 07:18:35PM -0400, Tom Horsley wrote:
> On Mon, 6 Aug 2007 22:31:24 +0100
> "Daniel P. Berrange" <berrange at redhat.com> wrote:
> 
> > If the time delta between your gettimeofday() calls does not exactly 
> > match the time delta between your virDomainGetInfo() calls, and the 
> > domain you're measuring is very active then you can end up calcuating 
> > > 100% occassionally. Not by much - typically < 1% over, but I don't  
> > really see any way around it.
> 
> Shucks, it is easy to work around:
> 
>    if (percentcpu > 100) percentcpu = 100;

When I said "i don't see any way around it" I meant a way which would be
calculating correct/accurate figures. Clamping to 100% is just pretending 
the problem doesn't exist - though it is the hack I am already using  in 
virt-manager. 

Dan.
-- 
|=- Red Hat, Engineering, Emerging Technologies, Boston.  +1 978 392 2496 -=|
|=-           Perl modules: http://search.cpan.org/~danberr/              -=|
|=-               Projects: http://freshmeat.net/~danielpb/               -=|
|=-  GnuPG: 7D3B9505   F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 7D3B 9505  -=|