Messages in this thread | ![/](/images/icornerl.gif) | | Date | Mon, 15 Dec 2003 23:45:48 -0800 | From | George Anzinger <> | Subject | Re: Scheduler degradation since 2.5.66 |
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Jamie Lokier wrote: > George Anzinger wrote: > >>Try running the test with a requested sleep time of something less than >>0.999849 ms. All this is for the x86 which is using this time to do the >>best it can with the PIT which can only get this close to 1 ms ticks. You >>can even vary this number to see exactly where the round up actually >>happens. Ah, life in the nano world :) > > > Would it be better to program the PIT for lowest frequency that's >= 1.0ms.
Possibly. I haven't attempted to analize it. I do know it would make some of the math a bear. Integers like to round down (read truncate) so... But then, what we have isn't exactly fun :)
-- George Anzinger george@mvista.com High-res-timers: http://sourceforge.net/projects/high-res-timers/ Preemption patch: http://www.kernel.org/pub/linux/kernel/people/rml
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