RE: [Lhns-devel] Re: Who's doing what with cpu/memory/node hotplug?

Kenji Kaneshige
2004-05-17T02:34:09Z

Hi,

> > 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?
>
> Yes, it would count as NUMA node with a NUMA ID.
>
> So a NUMA node could have CPUs, memory, and I/O,
> where each of those may or may not be present.
>
> There could be a node without any CPU, memory, or I/O.
> An example would be an I/O only node with PCI devices
> that are hot plug. The PCI devices may or may not be
> connected at any point in time.

I don't know about NUMA much, but I think NUMA node ID is based
on the SRAT at the boot time. But SRAT doesn't have entries for I/O
devices. How should we create the NUMA node ID for I/O nodes at the
boot time?

Thanks,
Kenji Kaneshige

> -----Original Message-----
> From: lhns-devel-admin@lists.sourceforge.net
> [mailto:lhns-devel-admin@lists.sourceforge.net]On Behalf Of Russ Anderson
> Sent: Friday, May 14, 2004 10:49 PM
> To: Keiichiro Tokunaga
> Cc: Dave Hansen; tokunaga.keiich@jp.fujitsu.com; pj@sgi.com;
> ashok.raj@intel.com; lhns-devel@lists.sourceforge.net;
> linux-hotplug-devel@lists.sourceforge.net; colpatch@us.ibm.com;
> linux-ia64@vger.kernel.org; greg@kroah.com; pfg@sgi.com
> Subject: [Lhns-devel] Re: Who's doing what with cpu/memory/node hotplug?
>
>
> Keiichiro Tokunaga wrote:
> > Dave Hansen <haveblue@us.ibm.com> wrote:
> > > On Wed, 2004-05-12 at 23:35, Keiichiro Tokunaga wrote:
> > > >
> > > > I'm rather focusing on ACPI based container device hotplug.
> > > > A scope of LHNS includes a container device that contains
> > > > IO devices. I think such a devices couldn't be handled by NUMA
> > > > hotplug.
> > >
> > > 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?
>
> Yes, it would count as NUMA node with a NUMA ID.
>
> So a NUMA node could have CPUs, memory, and I/O,
> where each of those may or may not be present.
>
> There could be a node without any CPU, memory, or I/O.
> An example would be an I/O only node with PCI devices
> that are hot plug. The PCI devices may or may not be
> connected at any point in time.
>
> And Yes, SGI does have I/O only nodes (and memory only nodes).
>
> Thanks,
> --
> Russ Anderson, OS RAS/Partitioning Project Lead
> SGI - Silicon Graphics Inc rja@sgi.com
>
>
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