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]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20030603130912.GS8978@holomorphy.com \
--to=wli@holomorphy.com \
--cc=kernel@kolivas.org \
--cc=linux-kernel@vger.kernel.org \
--cc=pochini@shiny.it \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.