Re: [Xen-ia64-devel] PATCH: rewrite vcpu_get_psr

[Alex Williamson <alex.williamson@xxxxxx>]

On Mon, 2007-05-28 at 14:53 +0200, Tristan Gingold wrote:
> On Thu, May 10, 2007 at 02:15:34PM -0600, Alex Williamson wrote:
> > On Wed, 2007-05-09 at 06:10 +0200, Tristan Gingold wrote:
> > > Hi,
> > > 
> > > a stripped-down version of a previous patch: reimplement
> vcpu_get_psr.
> > > 
> > > Should be a noop, I don't think performance should be affected.
> > 
> > Unfortunately...
> > 
> > with patch:
> > 
> > real    6m0.483s
> > user    21m10.680s
> > sys     1m18.470s
> > 
> > without patch:
> > 
> > real    4m47.767s
> > user    16m55.060s
> > sys     0m53.240s
> 
> Hi,
> 
> I can now reproduce this slow-down.
> 
> However I don't understand your figures: how can real time be less than user
> time ?  Isn't real time the elapsed time ?

  Parallel build, -j4.  The real time is the elapsed time, user is
cumulative across all 4 CPUs.  Thanks,

        Alex

-- 
Alex Williamson                             HP Open Source & Linux Org.


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