Re: [Xen-devel] MPI benchmark performance gap between native linux anddomU

[Mark Williamson <maw48@xxxxxxxxxxxx>]

> Thanks for the advice. I will explicitly specify "cpu" option in domU's
> config file.

Probably good practice although, as you rightly point out, it doesn't matter 
in this case.

> So far, I think my experiments are not affected by this. In my experiments,
> I only run at most 1 domU besides dom0. I think the domU will be assigned
> to 2nd CPU even the assignment policy is round robin.

Ah yes, the code's been updated to choose the least loaded CPU.  Should be 
fine then.

Cheers,
Mark

> Xuehai
>
> Mark Williamson wrote:
> > On Tuesday 05 April 2005 23:29, xuehai zhang wrote:
> >>>I did not specify "cpu" option in Xen's configuration file, so I think
> >>>both dom0 and domU run on the  same CPU (1st CPU). I will try to assign
> >>>them to different CPUs later.
> >>
> >>I think I said something wrong here. If I do not specify "cpu" option in
> >>Xen config file, I observe Xen usually assigns the 2nd CPU to domU while
> >>running dom0 on the 1st CPU.
> >
> > Last time I looked, the default was to assign in a round robin fashion. 
> > i.e. the next domain you create will be on the 1st CPU (with dom0) unless
> > you explicitly specify otherwise - watch out this doesn't confuse your
> > testing.
> >
> > Cheers,
> > Mark

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