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From: Arjan van de Ven <arjan@infradead.org>
To: david@lang.hm
Cc: Adrian Bunk <bunk@stusta.de>, Benjamin LaHaise <bcrl@kvack.org>,
	Oleg Verych <olecom@flower.upol.cz>, rae l <crquan@gmail.com>,
	linux-kernel@vger.kernel.org
Subject: Re: -Os versus -O2
Date: Sun, 24 Jun 2007 18:17:20 -0700	[thread overview]
Message-ID: <1182734240.26621.2.camel@laptopd505.fenrus.org> (raw)
In-Reply-To: <Pine.LNX.4.64.0706241801320.10397@asgard.lang.hm>

On Sun, 2007-06-24 at 18:08 -0700, david@lang.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


  reply	other threads:[~2007-06-25  1:17 UTC|newest]

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-06-23  5:15 [PATCH] trivial: the memset operation on a automatic array variable should be optimized out by data initialization Denis Cheng
2007-06-23  7:59 ` Oleg Verych
2007-06-23 13:13   ` Adrian Bunk
2007-06-23 13:41     ` Oleg Verych
2007-06-23 13:57       ` Adrian Bunk
2007-06-23 15:21         ` Segher Boessenkool
2007-06-24 12:58   ` rae l
2007-06-24 22:25     ` Oleg Verych
2007-06-24 22:15       ` Arjan van de Ven
2007-06-24 23:23         ` Benjamin LaHaise
2007-06-25  0:09           ` Arjan van de Ven
2007-06-25  0:12             ` Benjamin LaHaise
2007-06-25  0:23               ` Arjan van de Ven
2007-06-25  0:41                 ` -Os versus -O2 Adrian Bunk
2007-06-25  0:58                   ` Arjan van de Ven
2007-06-25  1:08                     ` david
2007-06-25  1:17                       ` Arjan van de Ven [this message]
2007-06-25  1:33                         ` david
2007-06-25  1:41                           ` Rene Herman
2007-06-25  5:04                           ` Willy Tarreau
2007-06-25  7:08                             ` Segher Boessenkool
2007-06-25  7:15                               ` david
2007-06-25  7:41                                 ` Segher Boessenkool
2007-06-25  8:19                               ` Willy Tarreau
2007-06-25  8:41                                 ` Segher Boessenkool
2007-06-25  7:03                       ` Segher Boessenkool
2007-06-25  7:13                         ` david
2007-06-25  7:35                           ` Segher Boessenkool
2007-06-25  1:33                     ` Adrian Bunk
2007-06-25  1:23                   ` Rene Herman
2007-06-25  1:31                     ` Rene Herman
2007-06-25  1:34                   ` Jeff Garzik
2007-06-25  1:46                     ` Adrian Bunk
2007-06-25  2:19                       ` david
2007-06-24 23:33         ` memset() with zeroes (Re: [PATCH] trivial: the memset operation on a automatic array variable should be optimized out by data initialization) Oleg Verych

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