Re: [patch-mm 00/23] High resolution timer updates and x86_64 support

From: Mark Lord
Date: Mon Jun 11 2007 - 18:43:56 EST

Thomas Gleixner wrote:

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.


-------- 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@xxxxxx>
To: Linux Kernel <linux-kernel@xxxxxxxxxxxxxxx>, tglx@xxxxxxxxxxxxx
CC: Linus Torvalds <torvalds@xxxxxxxx>

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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