linux-kernel - Re: fastboot: unpacking initramfs faster

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Date:	Thu, 26 Mar 2009 12:26:35 +0100 (CET)
From:	Bodo Eggert <7eggert@....de>
To:	Andreas Robinson <andr345@...il.com>
cc:	7eggert@....de, Arjan van de Ven <arjan@...radead.org>,
	linux-kernel@...r.kernel.org
Subject: Re: fastboot: unpacking initramfs faster

On Thu, 26 Mar 2009, Andreas Robinson wrote:
> On Tue, 2009-03-24 at 23:11 +0100, Bodo Eggert wrote:
> > Andreas Robinson <andr345@...il.com> wrote:

> > > I then looked at multithreaded decompression and found that neither gzip
> > > files nor deflate streams provide enough information (eg block lengths)
> > > to let you share the decompression among threads.
> > > 
> > > It can be done of course, but obviously not without modifying file
> > > formats and userspace tools.
> > > 
> > > (Thoughts of snowballs and hell presented themselves at this point.)
> > 
> > Why not make a new set? http://7eggert.dyndns.org:8080/l/bgz.tar.gz
> 
> Hmm, well if you think there is a chance of it being accepted, then
> sure! I'll cook something up, but will be looking to use LZO first since
> it's a bit faster to begin with.

It's small enough, and now I've updated it to support lzo and put a
license into the files.

Thinking about it: It's now very kernel-specific, other users might like a
block signature to make it robust against errors - e.g. in the middle of a
.tar.bgz file. I think I'll change that soon and put 0x55aa in front of
each block.
-- 
Borges sumus. Resistere inutile est.
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