linux-kernel - Re: [PATCH] Add LZO1X compression support to the kernel

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Message-Id: <1178787224.5828.11.camel@localhost.localdomain>
Date:	Thu, 10 May 2007 09:53:44 +0100
From:	Richard Purdie <richard@...nedhand.com>
To:	David Woodhouse <dwmw2@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	LKML <linux-kernel@...r.kernel.org>, torvalds@...ux-foundation.org
Subject: Re: [PATCH] Add LZO1X compression support to the kernel

On Thu, 2007-05-10 at 09:26 +0100, David Woodhouse wrote:
> On Wed, 2007-05-09 at 23:21 -0700, Andrew Morton wrote:
> > Well that's attractive-looking code.
> 
> It's compression code. I've never seen compression code look nice :)
> 
> > Why is this needed?  What code plans to use it?
> 
> I'm itching to use it in JFFS2. Richard claims a 10% boot time speedup
> and 40% improvement on file read speed, with only a slight drop in the
> file compression ratio (when compared to zlib).

Right, the speed improvement is noticeable and useful. JFFS2 is the
primary use case, I've also implemented a crypto interface for it.

> > How many buffer overruns are there in it?
> 
> That I'm afraid I cannot tell you.

There is a "safe" decompression function which does bounds checking so
its at least been thought about by the author. The code has been around
in userspace for a while so hopefully any issues have been ironed out
before now.

Richard

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