PowerTOP: implement fuzzy timer timeouts
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#191 PowerTOP: implement fuzzy timer timeouts
Hello,
running Intel's new TimerTOP utility I noticed that icewm is pretty much the top cause for idle wakeups.
With my patch to allow merging timer timeouts (fuzzy timeout) I was able to kick the wakeups down from about 6 per second to 1.6 per second.
It's still a bit buggy, though (fixed-timeout timers such as the taskbar clock DON'T fire at the correct moment for some strange reason), which is why I'm merely "announcing" the patch right now to let others take notice, the real patch will follow in a day or two.
Implement fuzzy timers for timer merging, reducing CPU wakeups
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OK, here it is (or at least an initial version of it, whatever you may think of it).
Fixed-timeout timers now fire at the correct moment (taskbar clock), which is why wakeups are now reduced from 6 down to < 3 per second only.
I'm not sure about the naming of "DelayFuzziness". Any better, more descriptive name perhaps?
Since the new timeout analysis code is slightly non-trivial, could someone review it?
Default delay fuzziness is 10% of the delay value, which works quite nicely already to reduce wakeups.
One may want to enhance the code to allow for setting different fuzziness values for individual timers (e.g. some timers might be so unimportant that a very high fuzziness is ok).
Comments?
Thanks!
I'm now going to work on another patch to reduce wasteful IceWM CPU use which I just discovered.
File Added: icewm-1.2.30.fuzzy_timers.diff
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Hi, any comments so far? Not sure whether I'll be able to work on it soonish, but insightful comments could be useful anyway... thanks!
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Changed Summary to reflect TimerTOP -> PowerTOP evolution.
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