[Bug 601986] Re: Disk driver problems on Toshiba NB305Netbook

[Kyle Altendorf]

Thanks for the reply and I'm glad it's not just me.  I usually just
figure I'm going crazy when things like pressing keys and moving the
mouse seem to make a difference in speed.  :]

I think the most direct clue is the effect of the nohz kernel option
which I think controls the dynticks feature:

http://kernelnewbies.org/Linux_2_6_21#head-
8547911895fda9cdff32a94771c8f5706d66bba0

So, since dynticks is on by default (aka, when we have this problem)
that means that the scheduler is not necessarily being ticked.  I am
guessing that both your infinite loop program and the pressing of keys
are compensating for a bug in dynticks related to this hardware (or a
bug in the hardware I suppose) by forcing the scheduler to run.  A key
repeat rate of, say, 30Hz wouldn't be that far off the classic 100Hz
continuous tick.

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Disk driver problems on Toshiba NB305Netbook
https://bugs.launchpad.net/bugs/601986
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