From: Sonny Rao <sonny@burdell.org>
To: Paul Mackerras <paulus@samba.org>
Cc: torvalds@osdl.org, akpm@osdl.org, anton@samba.org,
Mike Kravetz <kravetz@us.ibm.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] POWER 4 fails to boot with NUMA
Date: Mon, 1 Aug 2005 02:23:22 -0400 [thread overview]
Message-ID: <20050801062322.GA32415@kevlar.burdell.org> (raw)
In-Reply-To: <17133.45774.226079.790875@cargo.ozlabs.ibm.com>
On Mon, Aug 01, 2005 at 12:27:42AM -0500, Paul Mackerras wrote:
> From: Mike Kravetz <kravetz@us.ibm.com>
>
> If CONFIG_NUMA is set, some POWER 4 systems will fail to boot. This is
> because of special processing needed to handle invalid node IDs (0xffff)
> on POWER 4. My previous patch to handle memory 'holes' within nodes
> forgot to add this special case for POWER 4 in one place.
>
> In reality, I'm not sure that configuring the kernel for NUMA on POWER 4
> makes much sense. Are there POWER 4 based systems with NUMA characteristics
> that are presented by the firmware? But, distros want one kernel for all
> systems so NUMA is on by default in their kernels. The patch handles those
> cases.
IIRC, In SMP mode the NUMA topology is exported. I've tried this on a
p690 and it worked correctly on older kernels (2.6.10 or 2.6.11)
I also noticed a nice speedup on a few things compared to LPAR mode :-)
Sonny
next prev parent reply other threads:[~2005-08-01 6:24 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-08-01 5:27 Paul Mackerras
2005-08-01 6:23 ` Sonny Rao [this message]
2005-08-02 15:43 ` Martin J. Bligh
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