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

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

Where did you get this number 255 from?

 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
> >>
> >>
> >> _______________________________________________
> >>
> Xen-devel mailing list
> >> Xen-devel@xxxxxxxxxxxxxxxxxxx
> >>
> http://lists.xensource.com/xen-devel
> >>
> >>
> >
> >
> >
>
>
>
> _______________________________________________
> Xen-devel mailing list
>
> Xen-devel@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-devel
>


--
> 
--
pradeep singh rautela

"Genius is 1% inspiration, and 99% perspiration" -
> not me :)

> _______________________________________________
> Xen-devel mailing list
> Xen-devel@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-devel



_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel