Date: Mon, 21 Aug 2006 03:07:44 +0200
From: Adrian Bunk <bunk@stusta.de>
To: Willy Tarreau <w@1wt.eu>
Cc: Andreas Steinmetz <ast@domdv.de>, Arjan van de Ven <arjan@infradead.org>,
       linux-kernel@vger.kernel.org, mtosatti@redhat.com,
       Mikael Pettersson <mikpe@it.uu.se>
Subject: Re: Linux 2.4.34-pre1
Message-ID: <20060821010744.GE11651@stusta.de>
References: <20060816235459.GM7813@stusta.de> <20060817051616.GB13878@1wt.eu> <1155797331.4494.17.camel@laptopd505.fenrus.org> <44E42A4C.4040100@domdv.de> <20060817090651.GP7813@stusta.de> <44E433DB.9090501@domdv.de> <20060818232501.GE7813@stusta.de> <20060819044533.GB24543@1wt.eu> <20060821003549.GC11651@stusta.de> <20060821004146.GL602@1wt.eu>
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On Mon, Aug 21, 2006 at 02:41:46AM +0200, Willy Tarreau wrote:
> On Mon, Aug 21, 2006 at 02:35:49AM +0200, Adrian Bunk wrote:
> > On Sat, Aug 19, 2006 at 06:45:33AM +0200, Willy Tarreau wrote:
> > >...
> > > Sometimes it will be compilers, but not by that much. Gcc3.[34] generally
> > > produce bigger code than 2.95 at -O2, but I don't think that people in the
> > > embedded world still use 2.95 much.
> > 
> > Comparing code size different gcc versions produce with -O2 is a bit 
> > unfair, the size of -Os code is more important in this case.
> 
> Yes, but the code produced by gcc-3.[34] -Os is so unoptimized that it's
> practically unusable for anything oocasionnaly using the CPU. I use it
> mainly for bootloaders and tools like this. On the opposite, gcc-2.95 -Os
> was still relatively well optimized, which often resulted in faster execution
> due to smaller cache footprint. And for many programs, I have relied on this
> combination.

Embedded people often care more about size than about speed.
E.g. the ARM people always use -Os (in both 2.4 and 2.6).

For people not caring that much about size, the difference of the size 
of -O2 output shouldn't matter.

> Cheers,
> Willy

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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