From: Dave Hansen <haveblue@us.ibm.com>
To: linux-ia64@vger.kernel.org
Subject: Re: [Lhns-devel] Re: Who's doing what with cpu/memory/node hotplug?
Date: Fri, 14 May 2004 01:28:37 +0000 [thread overview]
Message-ID: <1084498116.8564.86.camel@nighthawk> (raw)
In-Reply-To: <20040513150842.22F5.YGOTO@us.fujitsu.com>
On Thu, 2004-05-13 at 18:14, Keiichiro Tokunaga wrote:
> On Wed, 12 May 2004 23:50:58 -0700 Dave Hansen <haveblue@us.ibm.com> wrote:
> > Why not? We already export the information about which PCI busses are
> > attached to which NUMA nodes. How are I/O devices different from CPU or
> > memory?
>
> I have just one concern.
> How about a container device that contains IO devices only?
> - Does it count as a NUMA node?
> - Is it having a NUMA node ID?
I don't see any real reasons why we can't make I/O only nodes. I know
that we've run into and fixed a few situations where a node came up with
either no cpus or no memory for various reasons before. Does anybody
have any philosophical objections to having I/O only nodes?
In any case, I'd bet we'll need some form of this eventually. On my
hardware, It's probably possible to hotplug individual CPUs or sections
of memory in such a way that a node has no online cpus or memory. So,
we'll probably have to handle those cases anyway.
This seems familliar somehow. I have the feeling it's been discussed
before. Matt, does this ring a bell?
-- Dave
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WARNING: multiple messages have this Message-ID (diff)
From: Dave Hansen <haveblue@us.ibm.com>
To: linux-ia64@vger.kernel.org
Subject: Re: [Lhns-devel] Re: Who's doing what with cpu/memory/node hotplug?
Date: Fri, 14 May 2004 01:28:37 +0000 [thread overview]
Message-ID: <1084498116.8564.86.camel@nighthawk> (raw)
In-Reply-To: <20040513150842.22F5.YGOTO@us.fujitsu.com>
On Thu, 2004-05-13 at 18:14, Keiichiro Tokunaga wrote:
> On Wed, 12 May 2004 23:50:58 -0700 Dave Hansen <haveblue@us.ibm.com> wrote:
> > Why not? We already export the information about which PCI busses are
> > attached to which NUMA nodes. How are I/O devices different from CPU or
> > memory?
>
> I have just one concern.
> How about a container device that contains IO devices only?
> - Does it count as a NUMA node?
> - Is it having a NUMA node ID?
I don't see any real reasons why we can't make I/O only nodes. I know
that we've run into and fixed a few situations where a node came up with
either no cpus or no memory for various reasons before. Does anybody
have any philosophical objections to having I/O only nodes?
In any case, I'd bet we'll need some form of this eventually. On my
hardware, It's probably possible to hotplug individual CPUs or sections
of memory in such a way that a node has no online cpus or memory. So,
we'll probably have to handle those cases anyway.
This seems familliar somehow. I have the feeling it's been discussed
before. Matt, does this ring a bell?
-- Dave
next prev parent reply other threads:[~2004-05-14 1:28 UTC|newest]
Thread overview: 61+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-05-14 0:13 [Lhns-devel] Re: Who's doing what with cpu/memory/node hotplug? Yasunori Goto
2004-05-14 0:13 ` Yasunori Goto
2004-05-14 1:06 ` Paul Jackson
2004-05-14 1:06 ` Paul Jackson
2004-05-14 1:28 ` Dave Hansen [this message]
2004-05-14 1:28 ` Dave Hansen
2004-05-14 2:09 ` Jesse Barnes
2004-05-14 2:09 ` Jesse Barnes
2004-05-14 3:02 ` Keiichiro Tokunaga
2004-05-14 3:02 ` Keiichiro Tokunaga
2004-05-14 3:21 ` Dave Hansen
2004-05-14 3:21 ` Dave Hansen
2004-05-17 2:34 ` Kenji Kaneshige
2004-05-17 2:34 ` Kenji Kaneshige
2004-05-17 5:31 ` Dave Hansen
2004-05-17 5:31 ` Dave Hansen
2004-05-17 7:35 ` Matthias Fouquet-Lapar
2004-05-17 7:35 ` Matthias Fouquet-Lapar
2004-05-17 8:23 ` Dave Hansen
2004-05-17 8:23 ` Dave Hansen
2004-05-17 8:38 ` Matthias Fouquet-Lapar
2004-05-17 8:38 ` Matthias Fouquet-Lapar
2004-05-17 15:45 ` Grant Grundler
2004-05-17 15:45 ` Grant Grundler
2004-05-17 15:52 ` Dave Hansen
2004-05-17 15:52 ` Dave Hansen
2004-05-17 16:00 ` Ashok Raj
2004-05-17 16:00 ` Ashok Raj
2004-05-17 19:15 ` Matthias Fouquet-Lapar
2004-05-17 19:15 ` Matthias Fouquet-Lapar
2004-05-17 23:01 ` Matthew Dobson
2004-05-17 23:01 ` Matthew Dobson
2004-05-17 23:18 ` Luck, Tony
2004-05-17 23:18 ` Luck, Tony
2004-05-17 23:28 ` Dave Hansen
2004-05-17 23:28 ` Dave Hansen
2004-05-17 23:36 ` Jesse Barnes
2004-05-17 23:36 ` Jesse Barnes
2004-05-17 23:54 ` Grant Grundler
2004-05-17 23:54 ` Grant Grundler
2004-05-18 14:58 ` Russ Anderson
2004-05-18 20:16 ` Ashok Raj
2004-05-18 20:16 ` Ashok Raj
2004-05-18 21:01 ` Jack Steiner
2004-05-18 21:01 ` Jack Steiner
2004-05-18 21:05 ` Andi Kleen
2004-05-18 21:05 ` Andi Kleen
2004-05-18 21:12 ` Greg KH
2004-05-18 21:12 ` Greg KH
2004-05-19 5:25 ` Matthias Fouquet-Lapar
2004-05-19 5:25 ` Matthias Fouquet-Lapar
2004-05-19 9:17 ` Paul Jackson
2004-05-19 9:17 ` Paul Jackson
2004-05-19 9:30 ` Matthias Fouquet-Lapar
2004-05-19 9:30 ` Matthias Fouquet-Lapar
2004-05-19 10:22 ` Paul Jackson
2004-05-19 10:22 ` Paul Jackson
2004-05-19 14:40 ` Howell, David P
2004-05-19 14:40 ` Howell, David P
2004-05-19 14:56 ` Matthias Fouquet-Lapar
2004-05-19 14:56 ` Matthias Fouquet-Lapar
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