Re: 2.6.1 "clock preempt"?
From: timothy parkinson (t_at_timothyparkinson.com)
Date: 01/22/04
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Date: Thu, 22 Jan 2004 14:37:04 -0500 To: john stultz <johnstul@us.ibm.com>
hi john,
i think this sounds like the same issue that i've been seeing with 2.5/2.6
kernels for a while now. smp kernel on a dual PIII machine without preempt.
after running for a while the "losing ticks" shows up in dmesg, and the system
loses a lot of time. load seems to make it worse, so that just might be the
trigger.
i'll try that one-liner as well when i get a chance - you said that if the
system still loses time, that narrows it down to hardware, yes?
thanks...
timothy
On Wed, Jan 21, 2004 at 10:19:26AM -0800, john stultz wrote:
> On Wed, 2004-01-21 at 07:06, Steinar Hauan wrote:
> > On Tue, 2004-01-20 at 16:26, john stultz wrote:
> > > How quickly do you see this message? Does it happen right at boot time,
> > > or during load?
> >
> > boottime:
> > Jan 19 08:59:24 localhost kernel: Linux version 2.6.1
> > (root@offa) (gcc version 3.3.2 20031218
> > (Red Hat Linux 3.3.2-5)) #2
> > SMP Sat Jan 17 18:05:09 EST 2004
> >
> > (yes, i have SMP enabled even for a single cpu machine; the kernel
> > will be run on a multitude of machines of which most are SMP)
> >
> > log messages prior to time issues:
> >
> > Jan 20 04:02:01 localhost anacron[6057]: Updated timestamp for
> > job `cron.daily' to
> > 2004-01-20
> > Jan 20 04:05:38 localhost kernel: hdb: dma_timer_expiry:
> > dma status == 0x61
> > Jan 20 04:05:48 localhost kernel: hdb: DMA timeout error
> > Jan 20 04:05:48 localhost kernel: hdb: dma timeout error:
> > status=0xd0 {Busy }
> > Jan 20 04:05:48 localhost kernel: hda: DMA disabled
> > Jan 20 04:05:48 localhost kernel: hdb: DMA disabled
> > Jan 20 04:05:48 localhost kernel: ide0: reset: success
> >
> > (hda and hdb are on the same controller; the only active disk at
> > this time should be hda ... hdb should be essentially idle
> > except for cron.daily scripts running around then)
> >
> > timing error starts here; interactive work
> >
> > Jan 20 07:52:40 localhost kernel: Losing too many ticks!
>
> Hmm. It might be that IDE PIO mode on your system blocks interrupts for
> too long.
>
> > > You might want to try the attached patch to see if we're overreacting
> > [...]
> > > Also, do you see the problem when preempt is disabled
> >
> > testing overnight failed to reproduce the problem. note that the
> > original event only occurred after about 12 hrs of testing.
>
> Sorry, that was vague. Did you fail to reproduce the problem using the
> patch or with preempt disabled?
>
> > i'll install lm_sensors & smarttools and run cpuburn for a while
> > to ensure this is not related to any hardware issues.
>
> I doubt its its a hardware fault issue, but more likely some driver not
> working properly with your hardware and blocking interrupts for too
> long.
>
> thanks
> -john
>
> -
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