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

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Date:	Thu, 14 Aug 2008 01:59:50 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Jeff Chua" <jeff.chua.linux@...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 12:16 AM, Jeff Chua <jeff.chua.linux@...il.com> wrote:
> 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
>
>

double checked on one 16 cores system got

CPU: L1 I Cache: 64K (64 bytes/line), D cache 64K (64 bytes/line)
CPU: L2 Cache: 512K (64 bytes/line)
CPU 0(4) -> Core 0
Intel machine check architecture supported.
Intel machine check reporting enabled on CPU#0.
using C1E aware idle routine
Checking 'hlt' instruction... OK.
ACPI: Core revision 20080609
Parsing all Control Methods:
Table [DSDT](id 0001) - 1289 Objects with 114 Devices 462 Methods 26 Regions
Parsing all Control Methods:
Table [SSDT](id 0002) - 80 Objects with 0 Devices 0 Methods 0 Regions
 tbxface-0596 [00] tb_load_namespace     : ACPI Tables successfully acquired
evxfevnt-0091 [00] enable                : Transition to ACPI mode successful
More than 8 CPUs detected - skipping them.
Use CONFIG_X86_GENERICARCH and CONFIG_X86_BIGSMP.
enabled ExtINT on CPU#0

YH
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