linux-kernel - Re: 2.6.27rc1 cannot boot more than 8CPUs

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Date:	Tue, 05 Aug 2008 20:31:19 -0700
From:	Max Krasnyansky <maxk@...lcomm.com>
To:	Jeff Chua <jeff.chua.linux@...il.com>
CC:	lkml <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.27rc1 cannot boot more than 8CPUs

Jeff Chua wrote:
> I've a Dell R900 with 4 quad-core Xeon processors (total 16CPUs), but
> can only managed to boot up with CONFIG_NR_CPUS=8. Setting
> CONFIG_NR_CPUS=16 causes the kernel to hang while booting.

You could try booting CONFIG_NR_CPUS=16 with maxcpus=8 (kernel command line
option).

If it boots you can then try bringing the rest of the cpus online manually
	echo 1 > /sys/devices/system/cpu/cpu8/online
         ...
	echo 1 > /sys/devices/system/cpu/cpu15/online

Might get a better OOPS/BUG_ON/etc report.

Max
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