From: Timothy Miller <miller@techsource.com>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Adrian Bunk <bunk@fs.tum.de>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [2.6 patch] add an -Os config option
Date: Tue, 12 Aug 2003 14:03:12 -0400 [thread overview]
Message-ID: <3F392BE0.1060908@techsource.com> (raw)
In-Reply-To: 1060695341.21160.2.camel@dhcp22.swansea.linux.org.uk
Alan Cox wrote:
> On Llu, 2003-08-11 at 22:11, Adrian Bunk wrote:
>
>>+config OPTIMIZE_FOR_SIZE
>>+ bool "Optimize for size" if EMBEDDED
>>+ default n
>>+ help
>>+ Enabling this option will pass "-Os" instead of "-O2" to gcc
>>+ resulting in a smaller kernel.
>>+
>>+ The resulting kernel might be significantly slower.
>
>
> With most of the gcc's I tried -Os was faster.
Why is -Os faster? Fewer cache misses?
Wouldn't that make -O2 kinda pointless? It seems kinda futile to
optimize for speed just to have it come out slower.
next prev parent reply other threads:[~2003-08-12 17:48 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-08-11 21:11 [2.6 patch] add an -Os config option Adrian Bunk
2003-08-11 21:19 ` Michael Buesch
2003-08-11 21:37 ` Mike Fedyk
2003-08-11 21:39 ` Christophe Saout
2003-08-11 21:41 ` Dagfinn Ilmari Mannsåker
2003-08-12 1:29 ` Gene Heskett
2003-08-12 2:51 ` Thomas Molina
2003-08-12 4:14 ` [OT] " Steven Cole
2003-08-12 15:25 ` Timothy Miller
2003-08-12 14:48 ` Gene Heskett
2003-08-12 10:11 ` Michael Buesch
2003-08-12 14:42 ` Gene Heskett
2003-08-12 1:45 ` Warren Turkal
2003-08-11 22:20 ` Russell King
2003-08-12 7:06 ` Christoph Hellwig
2003-08-12 15:43 ` Timothy Miller
2003-08-12 15:58 ` Adrian Bunk
2003-08-12 16:03 ` Kevin P. Fleming
2003-08-12 13:35 ` Alan Cox
2003-08-12 15:45 ` Joe Korty
2003-08-12 18:03 ` Timothy Miller [this message]
-- strict thread matches above, loose matches on Subject: below --
2003-08-12 19:43 John Bradford
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