From mboxrd@z Thu Jan 1 00:00:00 1970 From: tgh Subject: Re: Re: NUMA and SMP Date: Wed, 28 Mar 2007 09:50:16 +0800 Message-ID: <4609C9D8.7090306@ncic.ac.cn> References: <907625E08839C4409CE5768403633E0B018E1B10@sefsexmb1.amd.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: quoted-printable Return-path: In-Reply-To: <907625E08839C4409CE5768403633E0B018E1B10@sefsexmb1.amd.com> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: Xen Developers Cc: "Petersson, Mats" , Ryan Harper , Daniel Stodden List-Id: xen-devel@lists.xenproject.org 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=20 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=20 or a smp linux could support memory hotplug? I am confused about it could you help me Thanks in advance Petersson, Mats =E5=86=99=E9=81=93: > =20 > > =20 >> -----Original Message----- >> From: xen-devel-bounces@lists.xensource.com=20 >> [mailto:xen-devel-bounces@lists.xensource.com] On Behalf Of=20 >> Ryan Harper >> Sent: 23 March 2007 14:43 >> To: tgh >> Cc: Xen Developers; Daniel Stodden >> Subject: Re: [Xen-devel] Re: NUMA and SMP >> >> * tgh [2007-03-23 00:48]: >> =20 >>> hi >>> how many nodes in the numa with adm64 does xen support at present? >>> =20 >> in xen/include/asm-x86/numa.h: >> #define NODE_SHIFT=3D6 >> >> #in xen/include/xen/numa.h: >> #define MAX_NUMNODES =3D (1 << NODE_SHIFT); >> >> which works out to 64 nodes. I don't know if anyone has tested more >> than an 8 node system. >> =20 > > 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.=20 > > > 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 > =20 >> --=20 >> Ryan Harper >> Software Engineer; Linux Technology Center >> IBM Corp., Austin, Tx >> (512) 838-9253 T/L: 678-9253 >> ryanh@us.ibm.com >> >> _______________________________________________ >> Xen-devel mailing list >> Xen-devel@lists.xensource.com >> http://lists.xensource.com/xen-devel >> >> >> >> =20 > > > > > =20