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Date: Mon, 11 Aug 2008 13:03:58 -0700 From: "Yinghai Lu" <yhlu.kernel@...il.com> To: "Ingo Molnar" <mingo@...e.hu> Cc: "Jeff Chua" <jeff.chua.linux@...il.com>, "Linus Torvalds" <torvalds@...ux-foundation.org>, "David Miller" <davem@...emloft.net>, "Max Krasnyansky" <maxk@...lcomm.com>, "Li Zefan" <lizf@...fujitsu.com>, lkml <linux-kernel@...r.kernel.org> Subject: Re: 2.6.27rc1 cannot boot more than 8CPUs On Mon, Aug 11, 2008 at 12:59 PM, Ingo Molnar <mingo@...e.hu> wrote: > > * Jeff Chua <jeff.chua.linux@...il.com> wrote: > >> On Wed, Aug 6, 2008 at 2:42 PM, Jeff Chua <jeff.chua.linux@...il.com> wrote: >> > On Wed, Aug 6, 2008 at 2:01 PM, Linus Torvalds >> > <torvalds@...ux-foundation.org> wrote: >> >> One trivial thing to try would be to just bisect it. I assume 2.6.26 is >> > Bisecting now. >> >> Thanks to all the great helpful suggestions from everyone, and this >> turns out that I just need to enable the following switches, so I >> didn't bisect further, and since it's first machine that I've tried >> with more than 8 CPUs so I wasn't sure whether 2.6.16 has the same >> problem, but if you wish, I could give 2.6.16 a try. >> >> > CONFIG_X86_GENERICARCH=y >> > CONFIG_X86_BIGSMP=y >> >> Thank you all for the great linux kernel! > > i still consider a silent boot hang a bug we need to fix. > > bigsmp might be required to have all cpus available on your box, but the > kernel is still supposed to transparently fall back to less CPUs (and > print a warning) if it cannot do that. > in setup.c::setup_arch() after go over with madt or mptable #if defined(CONFIG_SMP) && defined(CONFIG_X86_PC) && defined(CONFIG_X86_32) if (def_to_bigsmp) printk(KERN_WARNING "More than 8 CPUs detected and " "CONFIG_X86_PC cannot handle it.\nUse " "CONFIG_X86_GENERICARCH or CONFIG_X86_BIGSMP.\n"); ===> here need to change "or" to "and" #endif or just panic here? because screen scroll to pass it, and user will not notice that... YH -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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