From: Con Kolivas <kernel@kolivas.org>
To: malc <av1474@comtv.ru>
Cc: linux-kernel@vger.kernel.org
Subject: Re: CPU load
Date: Mon, 12 Feb 2007 18:29:47 +1100 [thread overview]
Message-ID: <200702121829.47453.kernel@kolivas.org> (raw)
In-Reply-To: <Pine.LNX.4.64.0702121006030.1049@home.oyster.ru>
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
next prev parent reply other threads:[~2007-02-12 7:30 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-02-12 5:33 CPU load Vassili Karpov
2007-02-12 5:44 ` Con Kolivas
2007-02-12 5:54 ` malc
2007-02-12 6:12 ` Con Kolivas
2007-02-12 7:10 ` malc
2007-02-12 7:29 ` Con Kolivas [this message]
2007-02-12 5:55 ` Stephen Rothwell
2007-02-12 6:08 ` Con Kolivas
2007-02-12 14:32 ` Pavel Machek
2007-02-13 22:01 ` malc
2007-02-13 22:08 ` Con Kolivas
2007-02-14 7:28 ` malc
2007-02-14 8:09 ` Con Kolivas
2007-02-14 20:45 ` Pavel Machek
2007-02-25 10:35 ` malc
2007-02-26 9:28 ` Pavel Machek
2007-02-26 10:42 ` malc
2007-02-26 16:38 ` Randy Dunlap
2007-02-12 18:05 ` malc
-- strict thread matches above, loose matches on Subject: below --
2007-02-12 16:57 Andrew Burgess
2007-02-12 18:15 ` malc
2002-07-10 14:50 David Chow
2002-07-10 16:54 ` William Lee Irwin III
2002-07-10 17:49 ` Robert Love
2002-07-26 17:38 ` David Chow
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