linux-kernel - Re: -Os versus -O2

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Message-Id: <1182734240.26621.2.camel@laptopd505.fenrus.org>
Date:	Sun, 24 Jun 2007 18:17:20 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	david@...g.hm
Cc:	Adrian Bunk <bunk@...sta.de>, Benjamin LaHaise <bcrl@...ck.org>,
	Oleg Verych <olecom@...wer.upol.cz>, rae l <crquan@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: -Os versus -O2

On Sun, 2007-06-24 at 18:08 -0700, david@...g.hm wrote:
> >
> > on a system level, size can help performance because you have more
> > memory available for other things.  It also reduces download size and
> > gives you more space on the live CD....
> >
> > if you want to make things bigger again, please do this OUTSIDE the
> > "optimize for size" option. Because that TELLS you to go for size.
> 
> then do we need a new option 'optimize for best overall performance' that 
> goes for size (and the corresponding wins there) most of the time, but is 
> ignored where it makes a huge difference?

that isn't so easy. Anything which doesn't have a performance tradeoff
is in -O2 already. So every single thing in -Os costs you performance on
a micro level.

The translation to macro level depends greatly on how things are used
(you even have to factor in download times etc)... so that is a fair
question to leave up to the user... which is what there is today.

-- 
if you want to mail me at work (you don't), use arjan (at) linux.intel.com
Test the interaction between Linux and your BIOS via http://www.linuxfirmwarekit.org

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