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RE: [Xen-devel] Re: NUMA and SMP

To: "Ryan Harper" <ryanh@xxxxxxxxxx>, "tgh" <tianguanhua@xxxxxxxxxx>
Subject: RE: [Xen-devel] Re: NUMA and SMP
From: "Petersson, Mats" <Mats.Petersson@xxxxxxx>
Date: Fri, 23 Mar 2007 15:48:29 +0100
Cc: Xen Developers <xen-devel@xxxxxxxxxxxxxxxxxxx>, Daniel Stodden <stodden@xxxxxxxxxx>
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Thread-topic: [Xen-devel] Re: NUMA and SMP

> -----Original Message-----
> From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx 
> [mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] 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@xxxxxxxxxx> [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.

> -- 
> Ryan Harper
> Software Engineer; Linux Technology Center
> IBM Corp., Austin, Tx
> (512) 838-9253   T/L: 678-9253
> ryanh@xxxxxxxxxx
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