Re: [Xen-devel] compute performace problem

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 23 Apr 2005, at 16:06, Steven Hand wrote:

> > One of my users discovered large deviations in execution time for his
> > mpi jobs on xenUs.  I can reproduce the problem running his job on
> > a single VM.  On a native linux box the job completes in 64 secs +/-
> > a second or so.  On a xenU, it completes somewhere between 64 and 250
> > secs.  This is true on 2.0.5 (2.6.10-xenU) and 
> > 2.0-testing(2.6.11-xenU).
> > I tried xen-unstable but it seemed any task was taking 4 times as
> > long as on 2.0 so I guess its still too unstable.
> >
> > Any suggestions I can try?
> Can you repeat the experiment using the round robin scheduler in Xen 
> (i.e.
> boot with xen option "sched=rrobin")?
Probably will be worse -- I'm not certain that the rrobin scheduler is 
even smart enough not to include the idle domain in its round-robin 
schedule. An important reason why I killed it in the unstable tree.
 -- Keir


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