Messages in this thread |  | | | Date | Wed, 21 Jun 2006 23:36:32 -0700 | | From | "Martin J. Bligh" <> | | Subject | Re: [RFC] patch [1/1] convert i386 summit subarch to use SRAT data for apicid_to_node |
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.
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