Messages in this thread | | | Date | Thu, 14 Aug 2008 01:33:53 +0800 | From | "Jeff Chua" <> | Subject | Re: 2.6.27rc1 cannot boot more than 8CPUs |
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On Thu, Aug 14, 2008 at 1:10 AM, Jeff Chua <jeff.chua.linux@gmail.com> wrote: > On Wed, Aug 13, 2008 at 10:16 PM, Ingo Molnar <mingo@elte.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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