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Using Sparse File for Gentoo Portage

$ cd /usr/portage
$ mv distfiles /home/ftp/gentoo/distfiles
$ mv packages /home/ftp/gentoo/packages

$ dd if=/dev/null of=/.portage.sf bs=1048576 count=0 seek=600

$ mkfs.reiserfs -f /.portage.sf (or mkfs.reiser4)

$ mv /usr/portage /usr/portage.old

$ mount /.portage.sf /usr/portage -o loop,noatime,notail,nodev (reiser4 doesn't need notail)

$ cp -r --no-dereference --preserve=all -T \
    /usr/portage.old /usr/portage/

$ nano -w /etc/fstab

/.portage.sf  /usr/portage     reiserfs  loop,auto,noatime,notail,nodev  0 0
/.ccache.sf   /var/tmp/ccache  reiserfs  loop,auto,noatime,notail,nodev  0 0

$ df && du /.portage.sf

Filesystem           1K-blocks      Used Available Use% Mounted on
/.portage.sf            614376    178632    435744  30% /usr/portage
/.ccache.sf            2097084    498564   1598520  24% /var/tmp/ccache

179344  /.portage.sf

$ mount

/.portage.sf on /usr/portage type reiserfs (rw,nodev,noatime,loop=/dev/loop0,notail)
/.ccache.sf on /var/tmp/ccache type reiserfs (rw,nodev,noatime,loop=/dev/loop1,notail)

The sparse files:

-rw-r--r--  1 root    root    2147483648 2006-02-21 22:24 .ccache.sf
-rw-r--r--  1 root    root     629145600 2006-01-30 14:32 .portage.sf

RAID0 / RAID1 under AMD Duron 600MHz

256MB PC133
ML810LR motherboard

CHOST=i686-pc-linux-gnu
CFLAGS="-Os -pipe -mtune=athlon-tbird -fomit-frame-pointer -fno-ident -mmmx -m3dnow"

Benchmark

$ hdparm -tT /dev/md0

 Timing cached reads:   608 MB in  2.01 seconds = 302.77 MB/sec
 Timing buffered disk reads:  162 MB in  3.00 seconds =  53.92 MB/sec

 Timing cached reads:   592 MB in  2.00 seconds = 295.39 MB/sec
 Timing buffered disk reads:  168 MB in  3.00 seconds =  56.00 MB/sec

 Timing cached reads:   600 MB in  2.00 seconds = 299.38 MB/sec
 Timing buffered disk reads:  156 MB in  3.02 seconds =  51.58 MB/sec

 Timing cached reads:   616 MB in  2.00 seconds = 307.98 MB/sec
 Timing buffered disk reads:  168 MB in  3.00 seconds =  55.92 MB/sec

 Timing cached reads:   620 MB in  2.01 seconds = 308.75 MB/sec
 Timing buffered disk reads:  156 MB in  3.02 seconds =  51.65 MB/sec

 Timing cached reads:   612 MB in  2.01 seconds = 304.16 MB/sec
 Timing buffered disk reads:  156 MB in  3.00 seconds =  51.93 MB/sec

$ hdparm -tT /dev/md1

 Timing cached reads:   600 MB in  2.01 seconds = 298.79 MB/sec
 Timing buffered disk reads:  146 MB in  3.01 seconds =  48.53 MB/sec

 Timing cached reads:   612 MB in  2.00 seconds = 305.98 MB/sec
 Timing buffered disk reads:  152 MB in  3.01 seconds =  50.46 MB/sec

 Timing cached reads:   628 MB in  2.01 seconds = 312.73 MB/sec
 Timing buffered disk reads:  146 MB in  3.02 seconds =  48.34 MB/sec

 Timing cached reads:   600 MB in  2.01 seconds = 298.79 MB/sec
 Timing buffered disk reads:  146 MB in  3.01 seconds =  48.53 MB/sec

 Timing cached reads:   612 MB in  2.00 seconds = 305.98 MB/sec
 Timing buffered disk reads:  152 MB in  3.01 seconds =  50.46 MB/sec

 Timing cached reads:   628 MB in  2.01 seconds = 312.73 MB/sec
 Timing buffered disk reads:  146 MB in  3.02 seconds =  48.34 MB/sec

4X DVD Recording under AMD Duron 600MHz

256MB PC133
ML810LR motherboard

$ time growisofs -speed=10 -Z /dev/hda=test4700m.iso

Executing 'builtin_dd if=test4700m.iso of=/dev/hda obs=32k seek=0'
/dev/hda: "Current Write Speed" is 4.1x1385KBps.
 19267584/4702013440 ( 0.4%) @3.8x, remaining 24:18
 37486592/4702013440 ( 0.8%) @3.8x, remaining 18:39
   ....
4674682880/4702013440 (99.4%) @3.9x, remaining 0:04
4693098496/4702013440 (99.8%) @3.9x, remaining 0:01
builtin_dd: 2295920*2KB out @ average 3.9x1385KBps
/dev/hda: flushing cache
/dev/hda: updating RMA
/dev/hda: closing session

real    15m11.160s
user    0m6.736s
sys     2m27.657s

Power usage charts for AMD & Intel

Ever wonder how much power your system consumes? Find out here.

Gentoo Crossdev

Syntax:

$ crossdev --target i586-pc-linux-gnu

1) Target

C3-2 Samuel:   i586-pc-linux-gnu / i586-pc-linux-uclibc

2) Setup categories

$ mkdir -p /etc/portage
$ echo cross-i586-pc-linux-gnu >> /etc/portage/categories

3) Setup PORTDIR_OVERLAY=/usr/local/portage

$ mkdir -p /usr/local/portage/cross-i586-pc-linux-gnu
$ cd /usr/local/portage/cross-i586-pc-linux-gnu
$ ln -s /usr/portage/sys-devel/binutils binutils
$ ln -s /usr/portage/sys-devel/gcc gcc
$ ln -s /usr/portage/sys-kernel/linux-headers linux-headers
$ ln -s /usr/portage/sys-libs/glibc glibc

4) binutils

$ emerge cross-i586-pc-linux-gnu/binutils

5) gcc [C compiler only]

$ USE=nocxx emerge cross-i586-pc-linux-gnu/gcc
$ gcc-config 

6) linux headers

$ emerge cross-i586-pc-linux-gnu/linux-headers

7) glibc

$ USE=x86 emerge cross-i586-pc-linux-gnu/glibc

8) gcc [C and C++ compiler]

$ emerge cross-i586-pc-linux-gnu/gcc

9) Build stuff!

10) install a basic system into a target area

# use a stage-tarball OR
# check your USE variable!
# Many variables are needed for the root: $CTARGET $CHOST $CBUILD
$ ROOT="/tmp/minime" emerge uclibc busybox baselayout-lite dropbear
# When compiling glibc, you might notice that 'prefix' == /usr. This is OK, even if $ROOT points elsewhere

11) install other packages

$ ROOT="/tmp/minime" INSTALL_MASK="*.h" emerge mypackage

12) strip all symbols

You can add the following to your make.conf or export it in your environment.

PORTAGE_STRIP_FLAGS="--strip-unneeded -R .comment"

If your not using java and have no plans of it you can remove the .jcr as well or use this patch.