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

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Date:	Thu, 14 Aug 2008 15:16:58 +0800
From:	"Jeff Chua" <jeff.chua.linux@...il.com>
To:	"Yinghai Lu" <yhlu.kernel@...il.com>
Cc:	"Ingo Molnar" <mingo@...e.hu>,
	"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 2:33 AM, Yinghai Lu <yhlu.kernel@...il.com> wrote:

>>>> > With 16 CPUs, it still hangs, but now the console is showing the
>>>> > errors as intended.
>>>> > ... but it is supposed to hang?

> please check the attached patch. it should fix the new regression and
> will not hang.

Ok, booted up and not hanged, but those messages below don't show up
anywhere. I've tested with CONFIG_NR_CPUS=16 and 8 as well. Just got 8
cpus

More than 8 CPUs detected - skipping them.
Use CONFIG_X86_GENERICARCH and CONFIG_X86_BIGSMP.

# cat /sys/devices/system/cpu/possible
0-7

CONFIG_X86_32=y
CONFIG_X86_PC=y


Looks like it's not going into this condition
+        if (def_to_bigsmp && nr_cpu_ids > 8) {


Shall this be put back so that it'll show the message?
-       if (def_to_bigsmp && apicid > 8) {
-               printk(KERN_WARNING
-                       "More than 8 CPUs detected - skipping them.\n"
-                       "Use CONFIG_X86_GENERICARCH and CONFIG_X86_BIGSMP.\n");
-       }


Thanks,
Jeff.
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