linux-kernel - Re: [patch-mm 00/23] High resolution timer updates and x86

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Date:	Mon, 11 Jun 2007 18:43:44 -0400
From:	Mark Lord <lkml@....ca>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	LKML <linux-kernel@...r.kernel.org>, Andrew Morton <akpm@...l.org>,
	Ingo Molnar <mingo@...e.hu>, Andi Kleen <ak@...e.de>,
	Arjan van de Ven <arjan@...radead.org>,
	Venkatesh Pallipadi <venkatesh.pallipadi@...el.com>,
	Chris Wright <chrisw@...s-sol.org>
Subject: Re: [patch-mm 00/23] High resolution timer updates and x86_64	support

Thomas Gleixner wrote:
> Mark,
> 
> On Sun, 2007-06-10 at 18:46 -0400, Mark Lord wrote:
>> Do you know if there's anything specific in there that would fix
>> the start-up race condition with HRTIMERS on my machine here
>> (previously discussed, yet unresolved)?
>>
>> It still happens sporadically on boot-up -- maybe one in 10 boots without
>> any change in the kernel binary..
> 
> on which kernel version ?

Originally back with 2.6.21, but more recently on kernels as new as 2.6.22-rc3.

For now, I've simply grabbed your new patchset and applied it to 2.6.22-rc4-git*,
and I'll cry out again if the problem should recur with your latest stuff.

Thanks.

> 
> -------- Original Message --------
> Subject: [BUG] 2.6.21: Kernel won't boot with either/both of CONFIG_NO_HZ, CONFIG_HIGH_RES_TIMERS
> Date: Mon, 30 Apr 2007 16:17:00 -0400
> From: Mark Lord <lkml@....ca>
> To: Linux Kernel <linux-kernel@...r.kernel.org>, tglx@...utronix.de
> CC: Linus Torvalds <torvalds@...l.org>
> 
> I have a new notebook (Dell Inspiron 9400) with Core2-Duo T7400 @ 2.1Ghz.
> When either/both of CONFIG_NO_HZ, CONFIG_HIGH_RES_TIMERS is used,
> the 2.6.21 kernel hangs on startup just after printing one/both of these:
> 
> kernel: switched to high resolution mode on cpu 1
> kernel: switched to high resolution mode on cpu 0
> 
> 100% of the time.  The only fix I've found is to rebuild
> the kernel without those two options.
> 
> The failed kernel.config is attached.
> Here is /proc/cpuinfo and lspci -v.
> 
> Any help appreciated.

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