linux-kernel - Re: Help text for config OPTIMIZE

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Message-ID: <251184.8738.qm@web38204.mail.mud.yahoo.com>
Date:	Sat, 11 Oct 2008 12:05:05 -0700 (PDT)
From:	Sitsofe Wheeler <sitsofe@...oo.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Help text for config OPTIMIZE_INLINING

> From: Ingo Molnar <mingo@...e.hu>

> 
> * Sitsofe Wheeler wrote:
>  
> > While [this] suggests that one should set it to y to generate smaller 
> > kernels. My own experience says that setting it to y DOES generate a 
> > smaller kernel so perhaps the main text should be changed to reflect 
> > this?
> 
> sure, could you send a patch (with lkml Cc:-ed) that does this?

Will do (I won't send it via Yahoo mail though because it will be mangled).

> Also, would be nice if you sent with/without vmlinux size numbers for 
> the config you are using. Btw., do you have 

5463127 2008-10-11 19:51 vmlinux.no-opt
5456152 2008-10-11 19:56 vmlinux.opt

So about 6975 bytes smaller. This is a config which is vastly cut down, compiler was gcc version 4.1.2 20070925 (Red Hat 4.1.2-33) on Fedora 8.

> CONFIG_CC_OPTIMIZE_FOR_SIZE=y enabled as well? That too shrinks the 
> kernel (which speeds it up as well on moder CPUs), quite visibly.

In the past I've tried it out but it seemed to make my crude benchmark (glxgears) go slower...



      
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