linux-kernel - Re: [PATCH 3/6] Add support for LZO-compressed kernels

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Date:	Wed, 5 Aug 2009 11:19:21 +0200
From:	Albin Tonnerre <albin.tonnerre@...e-electrons.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	sam@...nborg.org, hpa@...or.com, linux@....linux.org.uk,
	alain@...ff.lu, linux-kernel@...r.kernel.org,
	linux-embedded@...r.kernel.org
Subject: Re: [PATCH 3/6] Add support for LZO-compressed kernels

On Tue, Aug 04, 2009 at 04:00:43PM -0700, Andrew Morton wrote :
> On Mon,  3 Aug 2009 16:58:18 +0200
> Albin Tonnerre <albin.tonnerre@...e-electrons.com> wrote:

> > This is the first part of the lzo patch
> > The lzo compressor is worse than gzip at compression, but faster at
> > extraction. Here are some figures for an ARM board I'm working on:

> > Uncompressed size: 3.24Mo
> > gzip  1.61Mo 0.72s
> > lzo   1.75Mo 0.48s

> > So for a compression ratio that is still relatively close to gzip, it's
> > much faster to extract, at least in that case.

> Is 3.2Mb a typical kernel size for small systems?  It sounds large.

This one actually embeds an initramfs which accounts for about half of the size.

> > +#ifdef STATIC

> What is this STATIC thing for?

That's what is currently used to test whether you're compiling the pre-boot
environment. eg. include/linux/decompress/mm.h uses this to determine whether it
should provide a malloc() implementation or simply #define malloc(a) kmalloc(a, GFP_KERNEL),
and a lot of similar things

-- 
Albin Tonnerre, Free Electrons
Kernel, drivers and embedded Linux development,
consulting, training and support.
http://free-electrons.com
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