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. It lays out what apicid belongs to what node. I use this information to create a table for use at run time. The attached patch was built against 2.6.17-rc2 but applies and runs against 2.6.17 just fine. It only changes the summit subarch although since a global data structure is created it might make sense to change all the subarches. All comments welcome. Signed-off-by: Keith Mannthey