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Message-Id: <1238593252-3435-1-git-send-email-andr345@gmail.com>
Date: Wed, 1 Apr 2009 15:40:50 +0200
From: Andreas Robinson <andr345@...il.com>
To: "H. Peter Anvin" <hpa@...or.com>, Alain Knaff <alain@...ff.lu>
Cc: linux-kernel@...r.kernel.org
Subject: [PATCH 0/2] lib, initramfs: Add initramfs LZO compression
this small patchset adds support for compressing initial ramdisks
into LZO (Lempel Ziv Oberhumer) format. It has been tested on x86
and x86_64. The patches apply to current git mainline.
In a pair of real-world examples, an Eee 901 boots ~120 ms faster.
A high-end desktop only saves an inconsequential 35 ms.
Specs:
* LZO data decompresses in 55 - 60% of the time needed by gzip,
when using the 'fast' decompressor.
* The decompressor is very small, < 2 kB on x86.
* An LZO-compressed initramfs takes 7-10% more disk space vs gzip.
Test results:
initramfs.cpio: 14174 kB
initramfs.gz: 4657 kB
initramfs.lzo: 5007 kB
Eee 901 Core i7 920
SSD 30MB/s HDD 60MB/s
gz lzo gz lzo
disk read 152 163 76 82
unpacking 247 113 95 54
----------------------------------
total 399 276 171 136
net gain 123 35
All values are milliseconds. Disk read times are estimates.
I have a patch that adds support for LZO-compressed kernels but
decided to not include it now since it's only implemented for x86.
Cheers,
Andreas
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