Re: [Xen-devel] compute performace problem

[Steven Hand <Steven.Hand@xxxxxxxxxxxx>]

>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")? 

cheers,

S.

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