Difference between revisions of "Centos-optimization"
From Bashlinux
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__NOTOC__ |
__NOTOC__ |
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| − | = |
+ | = CentOS Optimizations = |
| + | == Disk == |
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| − | In order to speedup the disk management, some values are added to each `ext3` partition on the terminal. |
+ | In order to speedup the disk management, some values are added to each `ext3` partition on the terminal. |
| + | The reference site is located at [http://wiki.centos.org/HowTos/Disk_Optimization] |
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<pre><nowiki> |
<pre><nowiki> |
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| − | === noatime === |
+ | ==== noatime ==== |
Don't write access time |
Don't write access time |
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| − | === data=writeback === |
+ | ==== data=writeback ==== |
The data order is not preserved when writes to disk. just after set this value and before restart the terminal run the following command to avoid goes into read-only mode. |
The data order is not preserved when writes to disk. just after set this value and before restart the terminal run the following command to avoid goes into read-only mode. |
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| − | === commit=120 === |
+ | ==== commit=120 ==== |
Set the time to sync data and metadata. |
Set the time to sync data and metadata. |
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to increase ''Maximum shared segment''. |
to increase ''Maximum shared segment''. |
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| − | = Boot optimizations = |
+ | == Boot optimizations == |
Reduce boot time passing the known values to the kernel, the site that references this optimizations can be found at [http://free-electrons.com/doc/embedded_linux_optimizations/img0.html] |
Reduce boot time passing the known values to the kernel, the site that references this optimizations can be found at [http://free-electrons.com/doc/embedded_linux_optimizations/img0.html] |
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| − | === lpj === |
+ | ==== lpj ==== |
Loops per jiffy can be obtained from `/var/log/messages` |
Loops per jiffy can be obtained from `/var/log/messages` |
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| − | === reboot=soft === |
+ | ==== reboot=soft ==== |
When reboots, the firmware will be skipped. |
When reboots, the firmware will be skipped. |
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| − | === quiet === |
+ | ==== quiet ==== |
Doesn't log all the boot messages to the `stdout` |
Doesn't log all the boot messages to the `stdout` |
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Revision as of 06:27, 3 February 2010
CentOS Optimizations
Disk
In order to speedup the disk management, some values are added to each `ext3` partition on the terminal. The reference site is located at [1]
LABEL=/ / ext3 defaults,noatime,data=writeback,commit=120 1 1 tmpfs /dev/shm tmpfs defaults 0 0 devpts /dev/pts devpts gid=5,mode=620 0 0 sysfs /sys sysfs defaults 0 0 proc /proc proc defaults 0 0 /hpswap swap swap defaults 0 0
noatime
Don't write access time
data=writeback
The data order is not preserved when writes to disk. just after set this value and before restart the terminal run the following command to avoid goes into read-only mode.
tune2fs -o +journal_data_writeback /dev/hda1
commit=120
Set the time to sync data and metadata.
System Optimizations
In `/etc/sysctl.conf` set the vualue
kernel.shmmax = 63554432
to increase Maximum shared segment.
Boot optimizations
Reduce boot time passing the known values to the kernel, the site that references this optimizations can be found at [2]
# grub.conf generated by anaconda
#
# Note that you do not have to rerun grub after making changes to this file
# NOTICE: You do not have a /boot partition. This means that
# all kernel and initrd paths are relative to /, eg.
# root (hd0,0)
# kernel /boot/vmlinuz-version ro root=/dev/hda1
# initrd /boot/initrd-version.img
#boot=/dev/hda
default=0
timeout=0
splashimage=(hd0,0)/boot/grub/splash.xpm.gz
hiddenmenu
password --md5 $1$/omJBwhD$phlKUXHDZI6BMLkNSfNgD/
title uWink
root (hd0,0)
kernel /boot/vmlinuz-2.6.18-53.el5 ro root=LABEL=/ rhgb vga=792 lpj=998235 reboot=soft quiet
initrd /boot/initrd-2.6.18-53.el5.img
lpj
Loops per jiffy can be obtained from `/var/log/messages`
reboot=soft
When reboots, the firmware will be skipped.
quiet
Doesn't log all the boot messages to the `stdout`
