linux-kernel - Re: Linux 2.4.34-pre1

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Date:	Mon, 21 Aug 2006 03:07:44 +0200
From:	Adrian Bunk <bunk@...sta.de>
To:	Willy Tarreau <w@....eu>
Cc:	Andreas Steinmetz <ast@...dv.de>,
	Arjan van de Ven <arjan@...radead.org>,
	linux-kernel@...r.kernel.org, mtosatti@...hat.com,
	Mikael Pettersson <mikpe@...uu.se>
Subject: Re: Linux 2.4.34-pre1

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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