Re: [PATCH] Dynamic tick, version 050127-1

[Pavel Machek <pavel@suse.cz>]

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Hi!

> > > Hmmm, that sounds like the local APIC does not wake up the PIT
> > > interrupt properly after sleep. Hitting the keys causes the timer
> > > interrupt to get called, and that explains why it keeps running. But
> > > the timer ticks are not happening as they should for some reason.
> > > This should not happen (tm)...
> > 
> > :-). Any ideas how to debug it? Previous version of patch seemed to work better...
> 
> I don't think it's HPET timer, or CONFIG_SMP. It also looks like your
> local APIC timer is working.

I ran find /, now my machine seems to work... Except that the time is
now two times as fast as it should be, ouch.

> If you have a serial console, you can put one letter printks in the
> code. Can you check if you ever get to smp_apic_timer_interrupt()?
> That's where you should get to after the sleep, and that calls the
> PIT timer interrupt to get it going again. I'm thinking that you'll
> get to smp_apic_timer_interrupt(), but once therebut function
> dyn_tick->interrupt(0, NULL, regs) never gets called.

Serial console would be slightly tricky to arrange...

Heh, is it possible that I'm not running NMI deadlock detector and
therefore it does not tick or something like that?

> It's OK to put printks to the timer code here, there's tons of 
> output only when the system is busy :)
> 
> Also, can you post your .config again? And also please post output
> from:
> 
> dmesg | grep -i "time\|tick\|apic"

pavel@amd:~$ dmesg | grep -i "time\|tick\|apic"
PCI: Setting latency timer of device 0000:00:11.5 to 64
dyn-tick: Maximum ticks to skip limited to 1339
dyn-tick: Timer using dynamic tick
pavel@amd:~$

Config is attached.
								Pavel
-- 
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