linux-kernel - Re: Patches for REALLY TINY 386 kernels

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Message-ID: <20070718183840.GC3898@one.firstfloor.org>
Date:	Wed, 18 Jul 2007 20:38:40 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Jan Engelhardt <jengelh@...putergmbh.de>
Cc:	Andi Kleen <andi@...stfloor.org>, "H. Peter Anvin" <hpa@...or.com>,
	Jonathan Campbell <jon@...dgrounds.com>,
	linux-kernel@...r.kernel.org, torvalds@...nsmeta.com
Subject: Re: Patches for REALLY TINY 386 kernels

On Wed, Jul 18, 2007 at 08:29:27PM +0200, Jan Engelhardt wrote:
> 
> On Jul 18 2007 20:20, Andi Kleen wrote:
> >> 
> >> Well, how big the vmlinux file is matters if it doesn't fit in memory
> >> with enough time to get to the phase where it is dumping the init
> >> sections.  
> >
> >If you don't have enough memory for a few tens of KB of init sections
> >you're very unlikely to have enough memory for user space.
> 
> If the code was not too hackish, I would not buy that.
> Routers for example can run -- minus the userspace utilities required to set
> things up -- "without" userspace.

They still need memory for packets and other data structures. 
Without having enough memory to queue packets and keep the routing cache you cannot do 
any useful routing.

-Andi
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