Yes, yes, we've heard this before. It is not a satisfactory answer, clearly the "idle" loop in kapm-idled could use a nice sleep(15) or something!! Chmouel Boudjnah wrote: > > SI Reasoning <[EMAIL PROTECTED]> writes: > > > There are good stretches of the day where my CPU spins > > at around 50% or more and the process spinning is > > kapm-idled. This is not a problem in 7.2. > > --=-=-= > http://www.tux.org/lkml/#s14-1: > > 1.Why is kapmd using so much CPU time? > (REG) Don't worry, it's not stealing valuable CPU time from > other processes. It's just consuming idle cycles (normally > charged to the idle task, which is displayed differently in > top). Normally, when your system is idle, the system idle > task is run, and this is shown as idle time (i.e. the "unused" > CPU time is not charged to a specific process). With APM > (Advanced Power Management), a special idle task (kapmd) is > required so that greater power saving techniques can be > enabled. So now, the "unused" CPU time is charged to the kapmd > task instead. > > --=-=-= > > --=-=-= > http://olstrans.sourceforge.net/release/OLS2000-apm/OLS2000-apm.html: > > In 2.2 and before, we basically had a hook into the idle loop, so that > if we had APM enabled, we would just tell the BIOS that we're > idle. In 2.3, Linus thought it would be a good idea if we had a > separate power management idle loop, so (he) we invented the > kernel APM daemon and I started getting bug reports about this > process that was using all our time, called kapmd. And if you sat > there just running top on a 2.3 kernel, the top process, if you're > not doing anything else, will be kapmd and it will be using like > 85% or 90% or 95% of your CPU time. These people were worried > because it was idle: why is it using all of the time? Well > actually, it's just that the time is getting accounted to that > process. It's not doing anything, it's the idle loop. [26m, 12s] > --=-=-= > > -- > MandrakeSoft Inc http://www.chmouel.org > --Chmouel
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