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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Mon, 11 Aug 2008 21:59:39 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Jeff Chua <jeff.chua.linux@...il.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Yinghai Lu <yhlu.kernel@...il.com>,
	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


* 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.

	Ingo
--
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/