Date Wed, 18 Jan 2012 16:05:20 +0100 From "Markus F.X.J. Oberhumer" <> Subject Re: Updated btrfs/crypto snappy interface ready for merging 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rather outdated - it seems to be based on the 2005 release.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.



Cheers,

Markus



--

Markus Oberhumer, <markus@oberhumer.com>, http://www.oberhumer.com/





