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

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Message-ID: <b6a2187b0808131033m25a7e147x98235a48abd3eb3c@mail.gmail.com>
Date:	Thu, 14 Aug 2008 01:33:53 +0800
From:	"Jeff Chua" <jeff.chua.linux@...il.com>
To:	"Ingo Molnar" <mingo@...e.hu>
Cc:	"Yinghai Lu" <yhlu.kernel@...il.com>,
	"David Miller" <davem@...emloft.net>,
	"Linux Kernel" <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.27rc1 cannot boot more than 8CPUs

On Thu, Aug 14, 2008 at 1:10 AM, Jeff Chua <jeff.chua.linux@...il.com> wrote:
> On Wed, Aug 13, 2008 at 10:16 PM, Ingo Molnar <mingo@...e.hu> wrote:
>
>> btw., could you please check that v2.6.27-rc3 (or later) kernels boot
>> fine (with about 8 cpus) even if you have genericarch/bigsmp disabled,
>> and do not silently hang as it happened on your box before?
>
> With 16 CPUs, it still hangs, but now the console is showing the
> errors as intended.
> ... but it is supposed to hang?

I tried with just CONFIG_NR_CPUS=8 and this time it booted, but stange
thing is I only see 2 CPUs! To be more precise, it's without both
CONFIG_X86_GENERICARCH and CONFIG_X86_BIGSMP.

And when I tried to enable the CPUs, it complained about:

# cat cpu6/online
0
# echo 1 > cpu6/online
More than 8 CPUs detected - skipping them.
Use CONFIG_X86_GENERICARCH and CONFIG_X86_BIGSMP.
-bash: echo: write error: Input/output error

Prior to the patch, the system booted with all 8 CPUs.

Again, if I enable both CONFIG_X86_GENERICARCH and CONFIG_X86_BIGSMP,
I get all 16 CPUs.

Thanks,
Jeff.
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