Re: [RFC] patch [1/1] convert i386 summit subarch to use SRAT data for apicid_to_node

[Dave Jones <davej@redhat.com>]

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.

		Dave

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