From: William Lee Irwin III <wli@holomorphy.com>
To: Con Kolivas <kernel@kolivas.org>
Cc: Giuliano Pochini <pochini@shiny.it>,
linux kernel mailing list <linux-kernel@vger.kernel.org>
Subject: Re: [BENCHMARK] 100Hz v 1000Hz with contest
Date: Tue, 3 Jun 2003 06:09:12 -0700 [thread overview]
Message-ID: <20030603130912.GS8978@holomorphy.com> (raw)
In-Reply-To: <200306032036.49790.kernel@kolivas.org>
On Tue, 3 Jun 2003 18:00, Giuliano Pochini wrote:
>> Is there any problem using a frequency other than 100 and 1000Hz ?
On Tue, Jun 03, 2003 at 08:36:49PM +1000, Con Kolivas wrote:
> Not at all. These were chosen because they were the default 2.4 (100) and 2.5
> (1000) frequencies. The large difference in Hz was postulated to increase the
> in-kernel overhead and the amount of time spent tearing down and building up
> the cpu cache again. 2.4 running at 1000Hz shows poor performance at high
> (>4) loads whereas 2.5 doesn't seem to do this. I originally thought it was
> cache thrashing/trashing responsible. However since 2.5 performance is almost
> comparable at 100/1000 it seems to be that the pure interrupt overhead in 2.5
> is lower?
You could try profiling cache misses etc.
I blame count_active_tasks(). =)
-- wli
prev parent reply other threads:[~2003-06-03 12:55 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-06-03 3:21 [BENCHMARK] 100Hz v 1000Hz with contest Con Kolivas
2003-06-03 3:36 ` Zwane Mwaikambo
2003-06-03 4:44 ` Nick Piggin
2003-06-03 8:00 ` Giuliano Pochini
2003-06-03 10:36 ` Con Kolivas
2003-06-03 13:09 ` William Lee Irwin III [this message]
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