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

[tgh <tianguanhua@xxxxxxxxxx>]

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 åé:
>  
>
>   
> > -----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.
>
> --
> Mats
>   
> > --
> > Ryan Harper
> > Software Engineer; Linux Technology Center
> > IBM Corp., Austin, Tx
> > (512) 838-9253   T/L: 678-9253
> > ryanh@xxxxxxxxxx
> >
> > _______________________________________________
> > Xen-devel mailing list
> > Xen-devel@xxxxxxxxxxxxxxxxxxx
> > http://lists.xensource.com/xen-devel
> >
> >
> >
> >     
>
>
>
>   

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel