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Message-ID: <86802c440802270925y2ed9b208j32f4d61d460c0c7@mail.gmail.com>
Date: Wed, 27 Feb 2008 09:25:35 -0800
From: "Yinghai Lu" <yhlu.kernel@gmail.com>
To: "Mike Travis" <travis@sgi.com>
Subject: Re: 2.6.24 git2/mm1: cpu_to_node mapping to non-existant nodes causing boot failure
Cc: "Mel Gorman" <mel@csn.ul.ie>, "Andrew Morton" <akpm@linux-foundation.org>,
       linux-kernel@vger.kernel.org, mingo@elte.hu, tglx@linutronix.de,
       "Christoph Lameter" <clameter@sgi.com>,
       "Jack Steiner" <steiner@sgi.com>
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On Wed, Feb 27, 2008 at 6:37 AM, Mike Travis <travis@sgi.com> wrote:
>
> Yinghai Lu wrote:
>  > On Tue, Feb 19, 2008 at 11:23 AM, Mel Gorman <mel@csn.ul.ie> wrote:
>  >> On (19/02/08 08:12), Mike Travis didst pronounce:
>  >>
>  >>> Mike Travis wrote:
>  >>  > > Mel Gorman wrote:
>  >>  > >
>  >>  > >> If you send me patches to apply on top of 2.6.25-rc1, I'll give them a spin
>  >>  > >> on the machine in question. Reverting didn't work out very well as there are
>  >>  > >> too many collisions with patches that were applied later. I eventually got
>  >>  > >> the machine booting but it only succeeds because it only brings up one core
>  >>  > >> on each processor.  The patch, which is pretty brain damaged is below in case
>  >>  > >> it helps you guess what the real problem is. dmesg logs are attached of the
>  >>  > >> vanilla failure with acpi=debug and the log with the patch applied showing
>  >>  > >> "__cpu_up: bad cpu 1" and "__cpu_up: bad cpu3" (i.e. the second cores of
>  >>  > >> each machine).
>  >>  > >>
>  >>  > >
>  >>  > > This should completely undo the change to 16 bit apic ids until we can figure
>  >>  > > out the problem with the memory-less nodes.  I checked it on both the numa
>  >>  > > and non-numa x86_64 box.
>  >>  > >
>  >>  > > Thanks,
>  >>  > > Mike
>  >>  > >
>  >>  >
>  >>  > Hi Mel,
>  >>  >
>  >>  > Did you get a chance to try out this patch to see if it cleared up the problem
>  >>  > booting on your x86_64 numa box?
>  >
>  > did it fail with x86.git#testing?
>  >
>  > YH
>
>  Hi,
>
>  My problem is that I haven't been able to set up a NUMA box where some of the nodes
>  have no memory.  The one box we have, the serial port doesn't work and it's in a lab
>  far, far away.  Everything else, it works fine.

x86.git#testing should be solid with numa and nodes without memory.

YH
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