Re: [Xen-devel] Re: NUMA and SMP - tgh - com.xensource.lists.xen-devel

35 messages in com.xensource.lists.xen-develRe: [Xen-devel] Re: NUMA and SMP

From	Sent On	Attachments
David Pilger	14 Jan 2007 03:55
Ryan Harper	14 Jan 2007 11:00
Anthony Liguori	15 Jan 2007 09:21
Petersson, Mats	16 Jan 2007 02:47
Emmanuel Ackaouy	16 Jan 2007 05:55
Petersson, Mats	16 Jan 2007 06:18
ron minnich	16 Jan 2007 06:50
Emmanuel Ackaouy	16 Jan 2007 08:13
Petersson, Mats	16 Jan 2007 08:30
tgh	20 Mar 2007 06:09
Petersson, Mats	20 Mar 2007 06:19
tgh	20 Mar 2007 06:49
Daniel Stodden	20 Mar 2007 06:51
Petersson, Mats	20 Mar 2007 08:50
Ryan Harper	20 Mar 2007 09:45
Petersson, Mats	20 Mar 2007 09:47
tgh	20 Mar 2007 18:08
Daniel Stodden	20 Mar 2007 19:44
tgh	21 Mar 2007 18:15
Daniel Stodden	22 Mar 2007 03:42
tgh	22 Mar 2007 05:13
Daniel Stodden	22 Mar 2007 05:28
Ryan Harper	22 Mar 2007 06:02
Daniel Stodden	22 Mar 2007 07:55
Ryan Harper	22 Mar 2007 08:11
Daniel Stodden	22 Mar 2007 08:38
Ryan Harper	22 Mar 2007 09:01
Daniel Stodden	22 Mar 2007 09:21
Ryan Harper	22 Mar 2007 10:02
tgh	22 Mar 2007 22:47
Ryan Harper	23 Mar 2007 07:42
Petersson, Mats	23 Mar 2007 07:48
tgh	27 Mar 2007 18:49
Ryan Harper	27 Mar 2007 19:00
Liang Yang	28 Mar 2007 14:24

Subject:	Re: [Xen-devel] Re: NUMA and SMP
From:	tgh (tian...@ncic.ac.cn)
Date:	03/27/2007 06:49:53 PM
List:	com.xensource.lists.xen-devel

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:

-----Original Message----- From: xen-...@lists.xensource.com [mailto:xen-...@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 <tian...@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.