[Bug 270798] Re: lockups with default (hpet) clocksource on 2.6.27-2-generic 64-bit

[Øyvind Stegard]

I'm suffering badly from these hpet messages in Ubuntu Lucid 10.04 x86 it seems. Don't know how critical they really are.
Today's session so far:
$ dmesg|grep hpet
[    0.000000] hpet clockevent registered
[    0.224755] hpet0: at MMIO 0xfed00000, IRQs 2, 8, 0
[    0.224760] hpet0: 3 comparators, 64-bit 14.318180 MHz counter
[    0.228208] Switching to clocksource hpet
[    0.554687] rtc0: alarms up to one month, y3k, 114 bytes nvram, hpet irqs
[   28.961077] CE: hpet increasing min_delta_ns to 15000 nsec
[  791.225076] CE: hpet increasing min_delta_ns to 22500 nsec
[ 1238.509081] CE: hpet increasing min_delta_ns to 33750 nsec
[16869.453011] CE: hpet increasing min_delta_ns to 50624 nsec
[18029.867095] CE: hpet increasing min_delta_ns to 75936 nsec
[19313.601918] CE: hpet increasing min_delta_ns to 113904 nsec
[19362.762508] CE: hpet increasing min_delta_ns to 170856 nsec
$ uname -a
Linux blackelf 2.6.32-21-generic #32-Ubuntu SMP Fri Apr 16 08:10:02 UTC 2010 i686 GNU/Linux

I've seen it go as high is ~800000 nsecs. Right now things are slow,
graphics seem to be suffering the most. However, there are no lockups
and apps don't crash randonmly. Note that I cannot say for sure if the
slowdown is caused by those hpet-messages or not. But every time I
notice slowdown, I usually see some hpet messages in the kernel log as
well. Lenovo Thinkpad Z61m, Intel Core Duo, 3GB RAM, ATI X1400 graphics,
radeon KMS+Compiz.

-- 
lockups with default (hpet) clocksource on  2.6.27-2-generic 64-bit
https://bugs.launchpad.net/bugs/270798
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