Brian Fundakowski Feldman wrote:
On Wed, Dec 21, 2005 at 02:17:59AM +0000, Maxim Sobolev wrote:
sobomax 2005-12-21 02:17:58 UTC
FreeBSD src repository
Modified files:
sys/boot/i386/libi386 biosmem.c i386_copy.c libi386.h
sys/boot/i386/loader main.c
Log:
For the cases when loading bzip2-compressed kernels enabled use last
3MB of physical memory for heap instead of range between 1MB and 4MB.
This makes this feature working with PAE and amd64 kernels, which are
loaded at 2MB. Teach i386_copyin() to avoid using range allocated by
heap in such case, so that it won't trash heap in the low memory
conditions.
This should make loading bzip2-compressed kernels/modules/mfs images
generally useable, so that re@ team is welcome to evaluate merits
of using this feature in the installation CDs.
Valuable suggestions by: jhb
Should probably just be using 7-zip instead, though.
Huh? Are you going to add appropriate loader(8) support? Besides, 7-zip
apparently even more memory hungry than bzip2:
d{N}: Sets Dictionary size - [0, 28], default: 23 (8MB)
The maximum value for dictionary size is 256 MB = 2^28 bytes.
Dictionary size is calculated as DictionarySize = 2^N bytes.
For decompressing file compressed by LZMA method with dictionary
size D = 2^N you need about D bytes of memory (RAM).
[EMAIL PROTECTED] lzma e /tmp/kernel /tmp/kernel.lzma
LZMA 4.17 Copyright (c) 1999-2004 Igor Pavlov 2005-04-18
[EMAIL PROTECTED] ls -l /tmp/kernel.lzma
-rw-r--r-- 1 sobomax wheel 1289963 21 дек 08:05 /tmp/kernel.lzma
[EMAIL PROTECTED] bzip2 -9 /tmp/kernel
[EMAIL PROTECTED] ls -l /tmp/kernel.bz2
-r-xr-xr-x 1 sobomax wheel 1514551 21 дек 08:04 /tmp/kernel.bz2
[EMAIL PROTECTED] sudo bunzip2 /tmp/kernel.bz2
[EMAIL PROTECTED] lzma e /tmp/kernel /tmp/kernel.lzma -d11
LZMA 4.17 Copyright (c) 1999-2004 Igor Pavlov 2005-04-18
[EMAIL PROTECTED] ls -l /tmp/kernel.lzma
-rw-r--r-- 1 sobomax wheel 1550520 21 дек 08:10 /tmp/kernel.lzma
As you can see, when memory size available for decompression is a
concern (roughly 2MB in this example) bzip2 provides comparable compression.
-Maxim
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