From: Dave Jones <davej@codemonkey.org.uk>
To: Andrew Morton <akpm@digeo.com>
Cc: William Lee Irwin III <wli@holomorphy.com>,
Bill Davidsen <davidsen@tmr.com>,
Aaron Lehmann <aaronl@vitelus.com>,
Con Kolivas <conman@kolivas.net>,
linux kernel mailing list <linux-kernel@vger.kernel.org>
Subject: Re: [BENCHMARK] 2.5.47{-mm1} with contest
Date: Thu, 21 Nov 2002 13:20:14 +0000 [thread overview]
Message-ID: <20021121132014.GC9883@suse.de> (raw)
In-Reply-To: <3DDC8330.FE066815@digeo.com>
On Wed, Nov 20, 2002 at 10:54:40PM -0800, Andrew Morton wrote:
> > I think this merits some investigation. I, for one, am a big user of
> > SIGIO in userspace C programs...
> OK, got it back to 119000. Each signal was calling copy_*_user 24 times.
> This gets it down to six.
Good eyes. But.. this also applies to 2.4 (which should also then
get faster). So the gap between 2.4 & 2.5 must be somewhere else ?
Also maybe we can do something about that multiple memcpy in copy_fpu_fxsave()
In fact, that looks a bit fishy. We copy 10 bytes each memcpy, but
advance the to ptr 5 bytes each iteration. What gives here ?
Dave
--
| Dave Jones. http://www.codemonkey.org.uk
| SuSE Labs
next prev parent reply other threads:[~2002-11-21 13:15 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-11-11 23:31 [BENCHMARK] 2.5.47{-mm1} with contest Con Kolivas
2002-11-12 0:09 ` Andrew Morton
2002-11-12 1:51 ` Con Kolivas
2002-11-12 2:07 ` mark walters
2002-11-12 2:18 ` Con Kolivas
2002-11-12 8:52 ` Giuliano Pochini
2002-11-12 9:20 ` Jens Axboe
2002-11-12 9:40 ` Con Kolivas
2002-11-12 3:04 ` Aaron Lehmann
2002-11-12 11:04 ` Andrew Morton
2002-11-12 14:20 ` Aaron Lehmann
2002-11-12 14:23 ` Jens Axboe
2002-11-12 20:37 ` Bill Davidsen
2002-11-12 20:59 ` Andrew Morton
2002-11-20 23:02 ` Andrew Morton
2002-11-21 0:08 ` William Lee Irwin III
2002-11-21 1:11 ` Alan Cox
2002-11-21 6:54 ` Andrew Morton
2002-11-21 13:20 ` Dave Jones [this message]
2002-11-21 17:21 ` Andrew Morton
2002-11-21 17:26 ` William Lee Irwin III
2002-11-21 18:18 ` Dave Jones
2002-11-21 18:25 ` Bill Davidsen
2002-11-21 14:00 ` Dave Jones
2002-11-21 19:59 ` Denis Vlasenko
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