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Message-ID: <874p6y25es.fsf@old-tantale.fifi.org> Date: 09 Jul 2008 13:01:31 -0700 From: Philippe Troin <phil@...i.org> To: "john stultz" <johnstul@...ibm.com> Cc: linux-kernel@...r.kernel.org Subject: Re: 2.6.25.9: system clocks works normally then speeds up 4x... "john stultz" <johnstul@...ibm.com> writes: > On Wed, Jul 9, 2008 at 12:21 PM, Philippe Troin <phil@...i.org> wrote: > > > > Symptoms: > > > > The system boots fine. Clock seems to run normally. > > > > Then after a random amount of time (on the current boot, 3 days), > > clock starts to be running 2-4x faster (on the current boot, 4x). > > > > I have tried booting with "nohz=off highres=off" but it does not > > help. > > Could you provide the output from the following: > sudo cat /sys/devices/system/clocksource/clocksource0/* Sure. It is: available: jiffies tsc current: jiffies > Did this issue occur with 2.6.24 or earlier kernels? No. It started with 2.6.25. Interestingly: I've just modified the current clocksource to tsc and the clock went back to its normal speed. Then I reset the current clocksource to jiffies, and the clock went back to its (wrong) 4x speed. So it looks like the kernel is counting jiffies 4x too fast. Phil. -- 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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