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Re: [Qemu-devel] [PATCH 1/3] pseries: Increase maximum CPUs to 256


From: Alexander Graf
Subject: Re: [Qemu-devel] [PATCH 1/3] pseries: Increase maximum CPUs to 256
Date: Wed, 20 Apr 2011 09:12:23 +0200

On 20.04.2011, at 08:31, David Gibson wrote:

> On Tue, Apr 19, 2011 at 05:02:21PM +0200, Alexander Graf wrote:
>> On 04/19/2011 02:44 PM, David Gibson wrote:
>>> On Tue, Apr 19, 2011 at 09:38:58AM +0200, Alexander Graf wrote:
>>>> On 19.04.2011, at 03:54, David Gibson wrote:
>>>> 
>>>>> From: Anton Blanchard<address@hidden>
>>>>> 
>>>>> The original pSeries machine was limited to 32 CPUs, more or less
>>>>> arbitrarily.  Particularly when we get SMT KVM guests it will be
>>>>> pretty easy to exceed this.  Therefore, raise the max number of CPUs
>>>>> in a pseries machine guest to 256.
>>>> Are the 256 limited by technical limits or arbitrary as well? :)
>>> Still arbitrary, just bigger.
>> 
>> Can't we set it to the real, technical limit then?
> 
> There is no clear real, technical limit.  It would depend on exactly
> what generation of pSeries we're talking about, and be in the
> thousands.

So I suppose we should set the max to the thousands then? Why limit it 
arbitrarily?


Alex




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