From: Jan-Benedict Glaw <jbglaw@lug-owl.de>
To: linux-kernel@vger.kernel.org
Subject: Re: [2.6 patch] add a config option for -Os compilation
Date: Tue, 21 Oct 2003 10:22:26 +0200 [thread overview]
Message-ID: <20031021082225.GA20846@lug-owl.de> (raw)
In-Reply-To: <20031018102127.GE12423@fs.tum.de>
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On Sat, 2003-10-18 12:21:27 +0200, Adrian Bunk <bunk@fs.tum.de>
wrote in message <20031018102127.GE12423@fs.tum.de>:
> On Wed, Oct 15, 2003 at 04:52:05PM -0700, Andrew Morton wrote:
> > I really doubt it. Kernel CPU footprint is dominated by dcache misses. If
> > -Os reduces icache footprint it may even be a net win; people tend to
> > benchmark things in tight loops, which favours fast code over small code.
>
> The main effect of -Os compared to -O2 (besides disabling some
> reordering of the code and prefetching) is the disabling of various
> alignments. I doubt that's a win on all CPUs.
I definively *like* to see -Os be configureable by user. It's *big* win
for a lowmem system. There, the actual "running speed" may be limited by
HDD swap speed, and having a smaller kernel means having more pages left
to luserspace...
MfG, JBG
--
Jan-Benedict Glaw jbglaw@lug-owl.de . +49-172-7608481
"Eine Freie Meinung in einem Freien Kopf | Gegen Zensur | Gegen Krieg
fuer einen Freien Staat voll Freier Bürger" | im Internet! | im Irak!
ret = do_actions((curr | FREE_SPEECH) & ~(NEW_COPYRIGHT_LAW | DRM | TCPA));
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next prev parent reply other threads:[~2003-10-21 8:22 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-10-15 22:50 [2.6 patch] add a config option for -Os compilation Adrian Bunk
2003-10-15 23:12 ` Andrew Morton
2003-10-15 23:24 ` Adrian Bunk
2003-10-15 23:52 ` Andrew Morton
2003-10-18 10:21 ` Adrian Bunk
2003-10-18 15:45 ` Martin J. Bligh
2003-10-18 17:24 ` Andrew Morton
2003-10-18 17:44 ` Adrian Bunk
2003-10-18 17:57 ` Andrew Morton
2003-10-19 15:43 ` Martin J. Bligh
2003-10-19 15:59 ` Adrian Bunk
2003-10-19 16:25 ` Arjan van de Ven
2003-10-19 18:32 ` Andrew Morton
2003-10-20 14:27 ` Martin J. Bligh
2003-10-21 8:22 ` Jan-Benedict Glaw [this message]
[not found] <Ip4B.8lT.23@gated-at.bofh.it>
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2003-10-19 17:04 ` Ihar 'Philips' Filipau
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2003-10-19 16:55 ` Ihar 'Philips' Filipau
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2003-10-19 16:05 ` Ihar 'Philips' Filipau
2003-10-19 16:14 ` Wichert Akkerman
2003-10-19 16:31 ` Valdis.Kletnieks
2003-10-19 16:57 ` Maciej Zenczykowski
2003-10-19 18:00 ` Valdis.Kletnieks
[not found] <20031015225055.GS17986@fs.tum.de.suse.lists.linux.kernel>
[not found] ` <20031015161251.7de440ab.akpm@osdl.org.suse.lists.linux.kernel>
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[not found] ` <20031018102127.GE12423@fs.tum.de.suse.lists.linux.kernel>
[not found] ` <649730000.1066491920@[10.10.2.4].suse.lists.linux.kernel>
[not found] ` <20031018102402.3576af6c.akpm@osdl.org.suse.lists.linux.kernel>
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2003-10-18 19:19 ` Andi Kleen
2003-10-19 13:56 ` Ingo Oeser
2003-10-19 14:09 ` Michael Buesch
2003-10-19 17:37 ` Sam Ravnborg
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[not found] ` <I1EP.5QO.1@gated-at.bofh.it>
2003-10-18 17:10 ` Ihar 'Philips' Filipau
[not found] ` <20031019113743.GO12423@fs.tum.de>
2003-10-19 14:15 ` Ihar 'Philips' Filipau
2003-10-19 15:40 ` Martin J. Bligh
-- strict thread matches above, loose matches on Subject: below --
2003-09-14 12:16 Adrian Bunk
2003-09-14 12:33 ` Russell King
2003-09-14 13:21 ` Adrian Bunk
2003-09-14 14:52 ` Russell King
2003-09-25 14:38 ` Adrian Bunk
2003-09-25 18:11 ` Sam Ravnborg
2003-09-26 11:44 ` Russell King
2003-09-26 22:36 ` Adrian Bunk
2003-09-14 13:53 ` Wade
2003-09-14 14:57 ` Alan Cox
2003-09-15 15:15 ` Martin J. Bligh
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