On Wed, 2006-06-21 at 23:36 -0700, Martin J. Bligh wrote:
> keith mannthey wrote:
> > On Wed, 2006-06-21 at 22:24 -0400, Dave Jones wrote:
> >
> >>On Wed, Jun 21, 2006 at 06:54:55PM -0700, keith mannthey wrote:
> >> > Hello All,
> >> > This patch converts the i386 summit subarch apicid_to_node to use node
> >> > information provided by the SRAT. The current way of obtaining the
> >> > nodeid
> >> >
> >> > static inline int apicid_to_node(int logical_apicid)
> >> > {
> >> > return logical_apicid >> 5;
> >> > }
> >> >
> >> > is just not correct for all summit systems/bios. Assuming the apicid
> >> > matches the Linux node number require a leap of faith that the bios lay-
> >> > ed out the apicids a set way. Modern summit HW does not layout its bios
> >> > in the manner for various reasons and is unable to boot i386 numa.
> >> >
> >> > The best way to get the correct apicid to node information is from the
> >> > SRAT table.
> >>
> >>Do all summit's have SRAT tables ?
> >>I was under the impression the early ones were around before
> >>the invention of SRAT.
> >
> >
> > That is a good point. Let me check into the x440 (1st gen). x445 x460
> > (2nd,3rd gen) uses SRAT for sure (these patches have been tested on
> > these systems).
> >
> > The x440 lists an srat but maybe it is using some special bios area. I
> > will build a test kernel give it a whirl.
>
> I'm pretty sure they all had SRAT tables - the test machine we use
> regularly for test.kernel.org (elm3b67) does. The NUMA-Q (x430) doesn't,
> but that's a separate subarch.
Tested ontop of x440 just fine it does use the SRAT. It doesn't do
anything NUMA-Q like :)
Thanks,
keith mannthey <[email protected]>
Linux Technology Center IBM
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