linux-kernel - Re: [PATCH 0/2] NR_CPUS: increase maximum NR

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Message-ID: <86802c440804081532t22daacfdq5f442da4897d1911@mail.gmail.com>
Date:	Tue, 8 Apr 2008 15:32:58 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Mike Travis" <travis@....com>
Cc:	"Ingo Molnar" <mingo@...e.hu>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] NR_CPUS: increase maximum NR_CPUS to 4096

On Tue, Apr 8, 2008 at 3:03 PM, Mike Travis <travis@....com> wrote:
> Yinghai Lu wrote:
>  > On Fri, Apr 4, 2008 at 6:30 PM, Mike Travis <travis@....com> wrote:
>  >>   * Increases the limit of NR_CPUS to 4096 and introduces a
>  >>     boolean called "MAXSMP" which when set (e.g. "allyesconfig")
>  >>     will set NR_CPUS = 4096 and NODES_SHIFT = 9 (512).
>  >>
>  >>     I've been running this config (4k NR_CPUS, 512 Max Nodes)
>  >>     on an AMD box with 2 dual-cores and 4gb memory as well as an
>  >>     Intel box with 4 single-core cpus and 8Mb.  I've also
>  >>     successfully booted it in a simulated 2cpus/1Gb environment.
>  >>
>  >>  Based on:
>  >>         git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git
>  >>     +   x86/latest          .../x86/linux-2.6-x86.git
>  >>     +   sched-devel/latest  .../mingo/linux-2.6-sched-devel.git
>  >>
>  >>  Signed-off-by: Mike Travis <travis@....com>
>  >
>  > got
>
>  Hi Yinghai,
>
>  Thanks for the feedback!  Would you send me your config file and
>  other details (like cpu type/mem size/etc.) and I'll attempt
>  to reproduce the failure.
>
>  (My problem is that only the AMD box is a real "workstation", the
>  Intel box is a dual quad-cpu server so it's really deficient in I/O.)
>

AMD quadcore eight sockets and 256G RAM

if I set NR_CPUS to 128 instead of 4096 it will be ok.

YH

Download attachment "config.4096" of type "application/octet-stream" (48769 bytes)