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

[pradeep singh <rautelap@xxxxxxxxx>]

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.
>
> On 24/8/07 15:32, "pradeep singh rautela" <rautelap@xxxxxxxxx> wrote:
> > On 8/24/07, Puthiyaparambil, Aravindh
>
> <aravindh.puthiyaparambil@xxxxxxxxxx>
>
> > wrote:
> > Xen x86_32/PAE supports 32 logical CPUs. This is a hard limit and
> > there is no easy way to increase this.
> >
> > Xen x86_64 supports 64 logical
> > CPUs. You need to compile Xen with max_phys_cpus=64 to enable this
> > support. If you want to go beyond 126 LCPUs some patching is needed.
> >
> > I guess you can
> > theoretically go up to 255 but I think you might run out of GDT slots
> > before that.
>
> Right, so why keep 255 there at all? I mean why hard code it  to a
>
> > max
>
> 255 then?Put it at a number a little near or higher than what Xen
>
> > is
>
> actually capable of.
>
> thanks
>
> > Aravindh Puthiyaparambil
> > Virtualization
> > Engineer
> > Virtual Systems Development
> > Unisys, Tredyffrin PA
> >
> >
> > -----Original Message-----
> > From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
> > [mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of tgh
> > Sent:
> > Friday, August 24, 2007 7:31 AM
> > To: pradeep singh rautela
> > Cc:
> > xen-devel@xxxxxxxxxxxxxxxxxxx
> > Subject: Re: [Xen-devel] how many processors
> > does xen support in hardware?
> >
> > pradeep singh rautela 写道:
> > > On 8/24/07,
> >
> > tgh <tianguanhua@xxxxxxxxxx> wrote:
> > >> hi
> > >>    how many processors
> >
> > does xen support in hardware for the practical
> >
> > >> system?
> > >
> > > Thats
> >
> > would be 255 i guess.
> >
> > thank you for your reply
> > but I want to kown the
> > max number of hardware cpus the xen could
> > support, or the xen's scalability
> > in the aspect of cpu number,not in the
> > aspect of the VM number
> >
> >
> > thanks
> >
> > > thanks
> > >
> > >>   what is the max number of processors in
> >
> > the practice system running
> >
> > >> under xen ?
> > >>
> > >>
> > >>
> > >> Thanks in
> >
> > advance
> >
> > >> _______________________________________________
> >
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> >
> > >> Xen-devel@xxxxxxxxxxxxxxxxxxx
> >
> > http://lists.xensource.com/xen-devel
> >
> >
> >
> >
> >
> >
> >
> >
> > _______________________________________________
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> >
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> > http://lists.xensource.com/xen-devel
>
> --
>
> --
> pradeep singh rautela
>
> "Genius is 1% inspiration, and 99% perspiration" -
>
> > not me :)
> >
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> > http://lists.xensource.com/xen-devel



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