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

[xuehai zhang <hai@xxxxxxxxxxxxxxx>]

Mark,

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

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.
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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