linux-kernel - Re: ANN: linux-kernel-lzo-2.06.20120123

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Date:	Mon, 23 Jan 2012 14:12:42 -0500
From:	Nitin Gupta <ngupta@...are.org>
To:	"Markus F.X.J. Oberhumer" <markus@...rhumer.com>
CC:	linux-kernel@...r.kernel.org, Andi Kleen <andi@...stfloor.org>,
	chris.mason@...cle.com, linux-btrfs@...r.kernel.org,
	Richard Purdie <rpurdie@...nedhand.com>
Subject: Re: ANN: linux-kernel-lzo-2.06.20120123 - update LZO to v2.06

Hi Markus,

Thanks for the patches!

On 01/23/2012 11:19 AM, Markus F.X.J. Oberhumer wrote:

> Hi,
> 
> I've prepared a small package that updates the LZO version in the Linux
> kernel to LZO v2.06.
> 
> Please get it from:
> 
>   http://www.oberhumer.com/opensource/lzo/download/Testing/linux-kernel-lzo-2.06.20120123.tar.gz
> 
> As stated in the README, its main purpose is to allow easy benchmarking of the
> latest LZO versions - these do feature some nice speed improvements, and while
> I have done a lot of synthetic benchmarking I'm really very curious and
> appreciate feedback on "real-world" performance numbers like usage in
> btrfs and zram.
> 

I will soon integrate them with zram and get some performance numbers.

Thanks,
Nitin



> 
> http://www.oberhumer.com/opensource/lzo/
> 
> On 2012-01-18 16:05, Markus F.X.J. Oberhumer wrote:
>> On 2012-01-13 01:28, Andi Kleen wrote:
>>> Here's a slightly updated version of the BTRFS snappy interface.
>>> snappy is a faster compression algorithm that provides similar
>>> compression as LZO, but generally better performance.
>>
>> I'd like to note that the LZO version in the current Linux kernel is
>> rather outdated - it seems to be based on the 2005 release.
>>
>> In fact the latest version LZO 2.06 does compress both slightly faster and
>> better than snappy 1.0.4 when benchmarking the Calgary and Silesia
>> compression corpus (tested with gcc 4.6 on Nehalem & Sandy Bridge).
>>
>> Furthermore please be aware that from a pure compression point of view
>> snappy et al. are very close cousins of LZO (strictly byte-aligned LZ77)
>> that mainly differ in implementation issues like using a table to
>> number of branches - and indeed similar optimizations could be applied
>> to any version.
>>
>> I'm not sure if there is an official kernel maintainer of LZO, but I'd
>> offer to assist you updating to the latest version and eliminating
>> any possible performance issues.
> 


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