linux-kernel - Re: [GIT PULL v2] Update LZO compression

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Date:	Wed, 22 Aug 2012 12:34:43 +0200
From:	Johannes Stezenbach <js@...21.net>
To:	"Markus F.X.J. Oberhumer" <markus@...rhumer.com>
Cc:	linux-kernel@...r.kernel.org, Andi Kleen <andi@...stfloor.org>,
	chris.mason@...ionio.com, linux-btrfs@...r.kernel.org,
	Nitin Gupta <ngupta@...are.org>,
	richard -rw- weinberger <richard.weinberger@...il.com>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [GIT PULL v2] Update LZO compression

On Tue, Aug 21, 2012 at 05:21:50PM +0200, Markus F.X.J. Oberhumer wrote:
> as suggested on the mailing list I have converted the updated LZO
> code into git, so please pull my "lzo-update" branch from
...
> [ Changes in v2: Optimize code for CPUs with inefficient unaligned
>   access => significant speed increase on ARM ]

I can confirm that this new code runs at the same speed
as the current lzo code in the Linux kernel on
my ARM926EJ-S based platform.  I only tested decompression,
using the attached hacky userspace code.

   # time ./lzo-bench/old/unlzop <lzoimage >/dev/null
   real    0m 0.29s
   # time ./lzo-bench/new/unlzop <lzoimage >/dev/null
   real    0m 0.29s

   (where lzoimage is a Linux Image compressed with lzop)

So, from my side there are no more objections.
Thanks for doing this work, Markus.


Johannes

Download attachment "lzo-bench.tar.gz" of type "application/octet-stream" (35783 bytes)