linux-kernel - Re: x86: 4kstacks default

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Message-ID: <20080420174249.GC20694@logfs.org>
Date:	Sun, 20 Apr 2008 19:43:11 +0200
From:	Jörn Engel <joern@...fs.org>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Willy Tarreau <w@....eu>, Mark Lord <lkml@....ca>,
	Adrian Bunk <bunk@...nel.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Shawn Bohrer <shawn.bohrer@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Arjan van de Ven <arjan@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: x86: 4kstacks default

On Sun, 20 April 2008 19:19:26 +0200, Andi Kleen wrote:
> 
> But these are SoC systems. Do they really run x86?
> (note we're talking about an x86 default option here)
> 
> Also I suspect in a true 16MB system you have to strip down
> everything kernel side so much that you're pretty much outside
> the "validated by testers" realm that Adrian cares about.

Maybe.  I merely showed that embedded people (not me) have good reasons
to care about small stacks.  Whether they care enough to actually spend
work on it - doubtful.

> > When dealing in those dimensions, savings of 100k are substantial.  In
> > some causes they may be the difference between 16MiB or 32MiB, which
> > translates to manufacturing costs.  In others it simply means that the
> > system can cache 
> 
> If you need the stack you don't have any less cache foot print.
> If you don't need it you don't have any either.

This part I don't understand.

Jörn

-- 
You ain't got no problem, Jules. I'm on the motherfucker. Go back in
there, chill them niggers out and wait for the Wolf, who should be
coming directly.
-- Marsellus Wallace
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