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

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Date:	Tue, 26 Feb 2013 22:58:02 +0100
From:	Peter Korsgaard <jacmet@...site.dk>
To:	Nicolas Pitre <nico@...xnic.net>
Cc:	"Markus F.X.J. Oberhumer" <markus@...rhumer.com>,
	Kyungsik Lee <kyungsik.lee@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Russell King <linux@....linux.org.uk>,
	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,
	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

>>>>> "Nicolas" == Nicolas Pitre <nico@...xnic.net> writes:

Hi,

 >> Did you actually *try* the new LZO version and the patch (which is attached
 >> once again) as explained in https://lkml.org/lkml/2013/2/3/367 ?
 >> 
 >> Because the new LZO version is faster than LZ4 in my testing, at least
 >> when comparing apples with apples and enabling unaligned access in
 >> BOTH versions:
 >> 
 >> armv7 (Cortex-A9), Linaro gcc-4.6 -O3, Silesia test corpus, 256 kB block-size:
 >> 
 >> compression speed   decompression speed
 >> 
 >> LZO-2012    :          44 MB/sec          117 MB/sec     no unaligned access
 >> LZO-2013-UA :          47 MB/sec          167 MB/sec     Unaligned Access
 >> LZ4 r88  UA :          46 MB/sec          154 MB/sec     Unaligned Access

 Nicolas> To be fair, you should also take into account the compressed
 Nicolas> size of a typical ARM kernel.  Sometimes a slightly slower
 Nicolas> decompressor may be faster overall if the compressed image to
 Nicolas> work on is smaller.

Yes, but notice that lzo compressed BETTER than lz4 - E.G. from the
introduction mail:

1. ARMv7, 1.5GHz based board
   Kernel: linux 3.4
   Uncompressed Kernel Size: 14MB
        Compressed Size  Decompression Speed
   LZO  6.7MB            21.1MB/s
   LZ4  7.3MB            29.1MB/s, 45.6MB/s(UA)

-- 
Bye, Peter Korsgaard
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