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

["Puthiyaparambil, Aravindh" <aravindh.puthiyaparambil@xxxxxxxxxx>]

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.

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
>>
>>     
>
>
>   


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