linux-kernel - Re: [RFC PATCH v2 0/4] Add support for LZ4-compressed kernel

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Message-ID: <20130227095139.GX17833@n2100.arm.linux.org.uk>
Date:	Wed, 27 Feb 2013 09:51:39 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Kyungsik Lee <kyungsik.lee@....com>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	"Markus F.X.J. Oberhumer" <markus@...rhumer.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, Michal Marek <mmarek@...e.cz>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-kbuild@...r.kernel.org, x86@...nel.org,
	celinux-dev@...ts.celinuxforum.org,
	Nicolas Pitre <nico@...xnic.net>,
	Nitin Gupta <nitingupta910@...il.com>,
	Richard Purdie <rpurdie@...nedhand.com>,
	Josh Triplett <josh@...htriplett.org>,
	Joe Millenbach <jmillenbach@...il.com>,
	David Sterba <dsterba@...e.cz>,
	Richard Cochran <richardcochran@...il.com>,
	Albin Tonnerre <albin.tonnerre@...e-electrons.com>,
	Egon Alter <egon.alter@....net>, hyojun.im@....com,
	chan.jeong@....com, raphael.andy.lee@...il.com
Subject: Re: [RFC PATCH v2 0/4] Add support for LZ4-compressed kernel

On Wed, Feb 27, 2013 at 04:36:47PM +0900, Kyungsik Lee wrote:
> Compiler: Linaro ARM gcc 4.6.2
> 2. ARMv7, 1.7GHz based board
>    Kernel: linux 3.7
>    Uncompressed Kernel Size: 14MB
>          Compressed Size  Decompression Speed
>     LZO  6.0MB            34.1MB/s            Old
>          ----------------------------------------
>          6.0MB            34.7MB/s            New
>          6.0MB            52.2MB/s(UA)
>     =============================================
>     LZ4  6.5MB            86.7MB/s
> UA: Unaligned memory Access support

That is pretty conclusive - it shows an 8% increase in image size vs a
66% increase in decompression speed.  It will take a _lot_ to offset
that increase in decompression speed.

So, what I think is that yes, we should accept LZ4 and drop LZO from
the kernel - the "fast but may not be small" compression title has
clearly been taken by LZ4.

Akpm - what's your thoughts?
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