Messages in this thread | | | Date | Mon, 11 Aug 2008 21:54:21 +0200 | From | Ingo Molnar <> | Subject | Re: 2.6.27rc1 cannot boot more than 8CPUs |
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* Jeff Chua <jeff.chua.linux@gmail.com> wrote:
> > On Wed, Aug 6, 2008 at 5:42 PM, Jeff Chua <jeff.chua.linux@gmail.com> > wrote: >>>> CONFIG_X86_GENERICARCH=y >>>> CONFIG_X86_BIGSMP=y >>>> 8 more cpu need bigsmp mode. > >> Just found it under " Subarchitecture Type (Generic architecture)", >> and then it shows the CONFIG_X86_BIGSMP option. > > It works. Booted with 16CPUs. 32GB RAM. > > CPU0 L7345 1.86GHz 0C > CPU1 L7345 1.86GHz 0C > CPU2 L7345 1.86GHz 0C > CPU3 L7345 1.86GHz 0C > CPU4 L7345 1.86GHz 0C > CPU5 L7345 1.86GHz 0C > CPU6 L7345 1.86GHz 0C > CPU7 L7345 1.86GHz 0C > CPU8 L7345 1.86GHz 0C > CPU9 L7345 1.86GHz 0C > CPU10 L7345 1.86GHz 0C > CPU11 L7345 1.86GHz 0C > CPU12 L7345 1.86GHz 0C > CPU13 L7345 1.86GHz 0C > CPU14 L7345 1.86GHz 0C > CPU15 L7345 1.86GHz 0C > > > So, but setting the config not obvious. And should CONFIG_X86_PC be > considered as well as CONFIG_X86_GENERICARCH? > > With CONFIG_X86_PC, I can set CONFIG_SPARSEMEM=y. > > With CONFIG_X86_GENERICARCH, CONFIG_SPARSEMEM depends on CONFIG_NUMA. > > I'm using the patch below to enable sparsemem instead of flatmem, but > don't know what impact it has. System booted and running. > > It would be nice to automatically default CONFIG_X86_BIGSMP with CPUs > > 8. But I don't know to do that.
thanks, applied.
i'm wondering, does with that patch applied a working 2.6.26 .config if put through 'make oldconfig' boot fine on your box now? Any make oldconfig breakage is a regression we want to fix. We want upgrades between kernel versions to be seemless and complete.
Ingo
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