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Re: [Xen-devel] RFC: large system support - 128 CPUs

  • To: Bill Burns <bburns@xxxxxxxxxx>
  • From: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
  • Date: Wed, 13 Aug 2008 12:15:14 +0100
  • Cc: xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • Delivery-date: Wed, 13 Aug 2008 04:15:42 -0700
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>
  • Thread-index: Acj9NduiGljmJmkpEd2S1gAX8io7RQ==
  • Thread-topic: [Xen-devel] RFC: large system support - 128 CPUs

On 13/8/08 11:53, "Bill Burns" <bburns@xxxxxxxxxx> wrote:

>> How many CPUs do you currently need/want to support?
> Currently just looking to get 128 working.
> But would be nice to have some proper sizing,
> or even detection of running out. There is a
> 'last' GDT entry or some such #define, that is
> never used (at least in the 3.1 code base).

I think your 'two pages' change will probably work. Then we just need a
run-time check when bringing a CPU online that there is space in the GDT for
its entries.

 -- Keir

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