From: Dave Jones <davej@redhat.com>
To: keith mannthey <kmannth@us.ibm.com>
Cc: lkml <linux-kernel@vger.kernel.org>
Subject: Re: [RFC] patch [1/1] convert i386 summit subarch to use SRAT data for apicid_to_node
Date: Wed, 21 Jun 2006 22:24:14 -0400 [thread overview]
Message-ID: <20060622022414.GB4449@redhat.com> (raw)
In-Reply-To: <1150941296.10001.25.camel@keithlap>
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
--
http://www.codemonkey.org.uk
next prev parent reply other threads:[~2006-06-22 2:24 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-06-22 1:54 [RFC] patch [1/1] convert i386 summit subarch to use SRAT data for apicid_to_node keith mannthey
2006-06-22 2:24 ` Dave Jones [this message]
2006-06-22 3:55 ` keith mannthey
2006-06-22 6:36 ` Martin J. Bligh
2006-06-22 19:21 ` keith mannthey
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