Messages in this thread | | | Subject | Re: 2.6.25.9: system clocks works normally then speeds up 4x... | From | Philippe Troin <> | Date | 09 Jul 2008 13:01:31 -0700 |
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"john stultz" <johnstul@us.ibm.com> writes:
> On Wed, Jul 9, 2008 at 12:21 PM, Philippe Troin <phil@fifi.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.
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