[PATCH 0/5] Add LZO Compression

[PATCH 0/5] Add LZO Compression

[Richard Purdie]

The following patch series adds LZO compression support to the kernel
and exposes it in a variety of places (jffs2, crypto).

This is particularly useful for jffs2 where significant boot time
speedups (~10%) and file read speed improvements (~40%) are seen when
its used with only a slight drop in file compression ratio.

It also adds a favourlzo mode to jffs2 which is similar to the existing
size mode but lets lzo compression win if the lzo compressed size is
"similar" to but not the best compression ratio. This means we can keep
zlib compression where it makes a significant difference to compressed
file size.

The final jffs2 patch which starts adding sysfs support is something I
have around from testing and I'm including it for comments to see if its
desirable upstream. It could be extended further to allow greater
control of jffs2 at runtime.

Richard

Re: [PATCH 0/5] Add LZO Compression

[Artem Bityutskiy]

On Wed, 2007-02-28 at 19:13 +0000, Richard Purdie wrote:
> The following patch series adds LZO compression support to the kernel
> and exposes it in a variety of places (jffs2, crypto).
> 
> This is particularly useful for jffs2 where significant boot time
> speedups (~10%) and file read speed improvements (~40%) are seen when
> its used with only a slight drop in file compression ratio.

Providing the digits are accurate, this is very good stuff.

-- 
Best regards,
Artem Bityutskiy (Битюцкий Артём)

[PATCH 0/5] Add LZO Compression

[Richard Purdie]

The following patch series adds LZO compression support to the kernel
and exposes it in a variety of places (jffs2, crypto).

Its a resend of a previous posted series, rediffed against recent
kernels with the couple of minors issues raised by David Woodhouse
addressed.

This patch series is also available as:
git://git.o-hand.com/linux-rpurdie linux-rpurdie-lzo
(http://git.o-hand.com/?p=linux-rpurdie;a=shortlog;h=linux-rpurdie-lzo)

LZO compression is particularly useful for jffs2 where significant boot
time speedups (~10%) and file read speed improvements (~40%) are seen
when its used with only a slight drop in file compression ratio.

It also adds a favourlzo mode to jffs2 which is similar to the existing
size mode but lets lzo compression win if the lzo compressed size is
"similar" to but not the best compression ratio. This means we can keep
zlib compression where it makes a significant difference to compressed
file size.

The final jffs2 patch which starts adding sysfs support for control of
jffs2 options at runtime that are currently available only at boottime.
There are several other controls which it may be desirable to add to the
basic framework this patch creates in due course.

Richard

[PATCH 0/5] Add LZO Compression

[Richard Purdie]

The following patch series adds LZO compression support to the kernel
and exposes it in a variety of places (jffs2, crypto).

Its a resend of a previous posted series with the comments from Randy
Dunlap and Satyam Sharma taken into account. Patch 1/5 is unchanged and
large so will not be resent.

This patch series is also available as:
git://git.o-hand.com/linux-rpurdie linux-rpurdie-lzo
(http://git.o-hand.com/?p=linux-rpurdie;a=shortlog;h=linux-rpurdie-lzo)

LZO compression is particularly useful for jffs2 where significant boot
time speedups (~10%) and file read speed improvements (~40%) are seen
when its used with only a slight drop in file compression ratio.

It also adds a favourlzo mode to jffs2 which is similar to the existing
size mode but lets lzo compression win if the lzo compressed size is
"similar" to but not the best compression ratio. This means we can keep
zlib compression where it makes a significant difference to compressed
file size.

The final jffs2 patch which starts adding sysfs support for control of
jffs2 options at runtime that are currently available only at boottime.
There are several other controls which it may be desirable to add to the
basic framework this patch creates in due course.

Richard