Re: [Xen-devel] how many processors does xen support in hardware?

[tgh <tianguanhua@xxxxxxxxxx>]

Thank you for your reply
and did you take any scalability experiments for xen under hardware 
platform with 16cpus or more cpus for datacenter application or any 
other applications? and what about the performance of xen ,comparing 
with the native linux?

Thanks



Mats Petersson åé:
> At 08:29 25/08/2007, you wrote:
> > hi
> > did someone make the experiment for the xen's scalability in the aspect
> > of the cpu number supported? and what about the performence with 16 cpus
> > , 32 cpus , and 64cpus, say ,comparing with the native linux?
>
> This would be very dependant on the workload type - something that 
> does a lot of page-table updates will be more affected by "xen 
> overhead" than something that does no page-table updates. Other than 
> that, a para-virtual guest should be fairly close to the native setup.
> Of course, finding machines with more than 32 cores is pretty 
> difficult, as 32 takes 8 sockets of quad-cores, and that's pretty much 
> the limit on "standard" motherboards - and even those are pretty darn 
> expensive.
> --
> Mats
>
>
>
>
> > pradeep singh $B<LF;(B:
> > > On Friday 24 August 2007 23:34:27 Keir Fraser wrote:
> > >
> > >> Oh, right, yes that is Linux's configurable maximum (itself fairly
> > >> arbitrary really). You can't actually use that number on Xen, so 
> > don't set
> > >> it so high. Simple really. :-)
> > >>
> > >
> > > Simple?...heh :-)
> > > I'll keep that in mind.
> > >
> > > thanks for insight.
> > > --pradeep
> > >
> > >> -- Keir
> > >>
> > >> On 24/8/07 19:00, "pradeep singh" <rautelap@xxxxxxxxx> wrote:
> > >>
> > >>> On Friday 24 August 2007 20:19:07 Keir Fraser wrote:
> > >>>
> > >>>> Where did you get this number 255 from?
> > >>>>
> > >>> Sorry i meant, while i compile the xen kernel i can configure 
> > kernel upto
> > >>> a max of 255. right?
> > >>>
> > >>> And i guess that means the number of CPUs you can compile your 
> > SMP kernel
> > >>> to work with.
> > >>> what did i miss? :-/
> > >>>
> > >>> thanks
> > >>> --pradeep
> > >>>
> > >>>
> > >>>> K.
> > >>>>
> > >>>>
> > > [snip]
> > >
> > >
> > >
> > > _______________________________________________
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> > > Xen-devel@xxxxxxxxxxxxxxxxxxx
> > > http://lists.xensource.com/xen-devel
> > >
> > >
> > > .
> > >
> > >
> >
> >
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>
>
> .

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