From: Andrew Morton <akpm@osdl.org>
To: Adrian Bunk <bunk@fs.tum.de>
Cc: mbligh@aracnet.com, linux-kernel@vger.kernel.org
Subject: Re: [2.6 patch] add a config option for -Os compilation
Date: Sat, 18 Oct 2003 10:57:33 -0700 [thread overview]
Message-ID: <20031018105733.380ea8d2.akpm@osdl.org> (raw)
In-Reply-To: <20031018174434.GJ12423@fs.tum.de>
Adrian Bunk <bunk@fs.tum.de> wrote:
>
> On Sat, Oct 18, 2003 at 10:24:02AM -0700, Andrew Morton wrote:
> > "Martin J. Bligh" <mbligh@aracnet.com> wrote:
> > >
> > > Please don't - I benchmarked it a while ago, and it's definitely slower.
> >
> > Alan said he generally found -Os to be faster...
>
> Not exactly:
> http://www.ussg.iu.edu/hypermail/linux/kernel/0211.0/1513.html
>
http://www.ussg.iu.edu/hypermail/linux/kernel/0308.1/1261.html
And bear in mind that you can see significant changes in benchmark results
between equivalent kernels even when the optimisation level is kept the
same, due to aliasing and alignment luck.
It would take a quite a lot of work to measure this properly. A simple A/B
comparison doesn't cut it.
next prev parent reply other threads:[~2003-10-18 17:57 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-10-15 22:50 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 [this message]
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
[not found] <Ip4B.8lT.23@gated-at.bofh.it>
[not found] ` <Ip4B.8lT.25@gated-at.bofh.it>
[not found] ` <Ip4B.8lT.27@gated-at.bofh.it>
[not found] ` <Ip4B.8lT.29@gated-at.bofh.it>
[not found] ` <Ip4B.8lT.31@gated-at.bofh.it>
[not found] ` <Ip4B.8lT.33@gated-at.bofh.it>
[not found] ` <Ip4B.8lT.35@gated-at.bofh.it>
[not found] ` <Ip4B.8lT.37@gated-at.bofh.it>
[not found] ` <Ip4B.8lT.39@gated-at.bofh.it>
[not found] ` <Ip4B.8lT.41@gated-at.bofh.it>
[not found] ` <Ip4B.8lT.43@gated-at.bofh.it>
[not found] ` <Ip4B.8lT.21@gated-at.bofh.it>
2003-10-19 17:04 ` Ihar 'Philips' Filipau
[not found] <Ioi6.7kG.15@gated-at.bofh.it>
[not found] ` <Ioi6.7kG.17@gated-at.bofh.it>
[not found] ` <Ioi6.7kG.19@gated-at.bofh.it>
[not found] ` <Ioi6.7kG.21@gated-at.bofh.it>
[not found] ` <Ioi6.7kG.23@gated-at.bofh.it>
[not found] ` <Ioi6.7kG.25@gated-at.bofh.it>
[not found] ` <Ioi6.7kG.27@gated-at.bofh.it>
[not found] ` <Ioi6.7kG.29@gated-at.bofh.it>
[not found] ` <Ioi6.7kG.31@gated-at.bofh.it>
[not found] ` <Ioi6.7kG.11@gated-at.bofh.it>
[not found] ` <IorM.7wQ.11@gated-at.bofh.it>
2003-10-19 16:55 ` Ihar 'Philips' Filipau
[not found] <I2Ue.7PG.3@gated-at.bofh.it>
[not found] ` <I2Ue.7PG.5@gated-at.bofh.it>
[not found] ` <I2Ue.7PG.7@gated-at.bofh.it>
[not found] ` <I2Ue.7PG.9@gated-at.bofh.it>
[not found] ` <I2Ue.7PG.11@gated-at.bofh.it>
[not found] ` <I2Ue.7PG.13@gated-at.bofh.it>
[not found] ` <I2Ue.7PG.1@gated-at.bofh.it>
[not found] ` <ImzK.4TR.25@gated-at.bofh.it>
[not found] ` <ImzK.4TR.23@gated-at.bofh.it>
[not found] ` <InYQ.6OJ.21@gated-at.bofh.it>
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>
[not found] ` <20031015232440.GU17986@fs.tum.de.suse.lists.linux.kernel>
[not found] ` <20031015165205.0cc40606.akpm@osdl.org.suse.lists.linux.kernel>
[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>
[not found] ` <20031018174434.GJ12423@fs.tum.de.suse.lists.linux.kernel>
[not found] ` <20031018105733.380ea8d2.akpm@osdl.org.suse.lists.linux.kernel>
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
[not found] <H2MN.3cm.7@gated-at.bofh.it>
[not found] ` <H366.3IC.9@gated-at.bofh.it>
[not found] ` <H3fO.3VO.13@gated-at.bofh.it>
[not found] ` <H3IO.4yt.9@gated-at.bofh.it>
[not found] ` <HWvz.5PI.9@gated-at.bofh.it>
[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
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=20031018105733.380ea8d2.akpm@osdl.org \
--to=akpm@osdl.org \
--cc=bunk@fs.tum.de \
--cc=linux-kernel@vger.kernel.org \
--cc=mbligh@aracnet.com \
/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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
all inboxes | Powered by JetHome®