Re: [BISECTED] 2.6.35.*: horrible (exponential? >linear) slowdown to unusability (HPET)

From: Nix
Date: Thu Sep 09 2010 - 19:57:33 EST


On 10 Sep 2010, John Drescher spake thusly:

>> John, Damien, you seem to be experiencing this: are you using HPET as
>> your clocksource? Do you also have ICH10 82801JIs, or is this more
>> widespread?
>>
> I am not using hpet as my clocksource.
>
> jmd1 ~ # uname -a
> Linux jmd1 2.6.35-std160-amd64 #2 SMP Fri Aug 13 18:42:02 UTC 2010
> x86_64 Intel(R) Core(TM) i7 CPU 920 @ 2.67GHz GenuineIntel GNU/Linux
> jmd1 ~ # cat /sys/devices/system/clocksource/clocksource0/current_clocksource
> tsc

Hm, interesting. Perhaps the HPET is needed anyway? (That would explain
why my other system, with identical specs to those above and using tsc
as clocksource, was seeing intermittent problems in this area.)

But 82801JI looks like a common factor.
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