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Date: Thu, 17 Apr 2008 11:02:13 -0700
From: "Yinghai Lu" <yhlu.kernel@gmail.com>
To: "Ingo Molnar" <mingo@elte.hu>, "Mike Travis" <travis@sgi.com>
Subject: Re: [PATCH] - Increase MAX_APICS for large configs
Cc: "Jack Steiner" <steiner@sgi.com>, tglx@linutronix.de, linux-mm@kvack.org,
       linux-kernel@vger.kernel.org, "H. Peter Anvin" <hpa@zytor.com>
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On Thu, Apr 17, 2008 at 4:07 AM, Ingo Molnar <mingo@elte.hu> wrote:
>
>  * Jack Steiner <steiner@sgi.com> wrote:
>
>  > Increase the maximum number of apics when running very large
>  > configurations. This patch has no affect on most systems.
>
>  x86.git overnight random-qa testing found a boot crash and i bisected it
>  down to this patch. The config is:
>
>   http://redhat.com/~mingo/misc/config-Thu_Apr_17_10_17_14_CEST_2008.bad
>
>  the failure is attached below. (I needed the exact boot parameters
>  listed in that bootup log to see this failure.)
>
>  it seems to be CONFIG_MAXSMP=y triggers the new more-apic-ids code and
>  that causes some breakage elsewhere. [btw., this again shows how useful
>  the CONFIG_MAXSMP debug feature is!]

so this one and Mike's 4096 NR_CPUS cause the problem?

2048 CPUs works.

YH