Re: Re: NUMA and SMP

[tgh <tianguanhua@ncic.ac.cn>]

hi
xen does not support numa-aware guest linux, is it right?
and there are memory-hotplug.c and migration.c in the linux2.6.20, does 
it means that linux could support the hotplug memory or not ?
if it could ,does linux have to be numa-aware to support memory hotplug 
or a smp linux could support memory hotplug?

I am confused about it

could you help me
Thanks in advance




Petersson, Mats 写道:
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>> -----Original Message-----
>> From: xen-devel-bounces@lists.xensource.com 
>> [mailto:xen-devel-bounces@lists.xensource.com] On Behalf Of 
>> Ryan Harper
>> Sent: 23 March 2007 14:43
>> To: tgh
>> Cc: Xen Developers; Daniel Stodden
>> Subject: Re: [Xen-devel] Re: NUMA and SMP
>>
>> * tgh <tianguanhua@ncic.ac.cn> [2007-03-23 00:48]:
>>     
>>> hi
>>> how many nodes in the numa with adm64 does xen support at present?
>>>       
>> in xen/include/asm-x86/numa.h:
>> #define NODE_SHIFT=6
>>
>> #in xen/include/xen/numa.h:
>> #define MAX_NUMNODES = (1 << NODE_SHIFT);
>>
>> which works out to 64 nodes.  I don't know if anyone has tested more
>> than an 8 node system.
>>     
>
> Of course, if we're talking AMD64 systems, if a NODE is a socket, the
> currently available architecture supports 8 NODES, so there's plenty of
> space to grow such a system. I think there's plans to grow this, but I
> doubt that the limit above will be reached anytime soon. 
>
>
> Even if a node is a core within a CPU, the current limit of 8 sockets
> will limit the number of cores in a system to 32 cores when the
> quad-core processors become available. So still sufficient to support
> any current architecture.
>
> --
> Mats
>   
>> -- 
>> Ryan Harper
>> Software Engineer; Linux Technology Center
>> IBM Corp., Austin, Tx
>> (512) 838-9253   T/L: 678-9253
>> ryanh@us.ibm.com
>>
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>>     
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