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Date: Mon, 12 Feb 2007 18:29:47 +1100 From: Con Kolivas <kernel@...ivas.org> To: malc <av1474@...tv.ru> Cc: linux-kernel@...r.kernel.org Subject: Re: CPU load On Monday 12 February 2007 18:10, malc wrote: > On Mon, 12 Feb 2007, Con Kolivas wrote: > > Lots of confusion comes from this, and often people think their pc > > suddenly uses a lot less cpu when they change from 1000HZ to 100HZ and > > use this as an argument/reason for changing to 100HZ when in fact the > > massive _reported_ difference is simply worse accounting. Of course there > > is more overhead going from 100 to 1000 but it doesn't suddenly make your > > apps use 10 times more cpu. > > Yep. This, i belive, what made the mplayer developers incorrectly conclude > that utilizing RTC suddenly made the code run slower, after all /proc/stat > now claims that CPU load is higher, while in reality it stayed the same - > it's the accuracy that has improved (somewhat) > > But back to the original question, does it look at what's running on timer > interrupt only or any IRQ? (something which is more in line with my own > observations) During the timer interrupt only. However if you create any form of timer, they will of course have some periodicity relationship with the timer interrupt. -- -ck - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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