Centos-optimization: Difference between revisions
From Bashlinux
Jump to navigationJump to search
Content deleted Content added
No edit summary |
Redirected page to CentOS optimizations |
||
| (2 intermediate revisions by the same user not shown) | |||
| Line 1: | Line 1: | ||
#REDIRECT [[CentOS optimizations]] |
|||
__NOTOC__ |
|||
= 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 [[http://wiki.centos.org/HowTos/Disk_Optimization]] |
|||
<pre><nowiki> |
|||
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 |
|||
/customswap swap swap defaults 0 0 |
|||
</nowiki></pre> |
|||
==== 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. |
|||
<pre><nowiki> |
|||
tune2fs -o +journal_data_writeback /dev/hda1 |
|||
</nowiki></pre> |
|||
==== commit=120 ==== |
|||
Set the time to sync data and metadata. |
|||
== Solid State Disk == |
|||
Usually the IDE SSD are slower that the SATA SSD, and some times could even be slower than the regular IDE. To speed up a bit, we can apply the changes mentioned above, but also scheduler can be changed in the following way: |
|||
<pre><nowiki> |
|||
# echo deadline > /sys/block/sda/queue/scheduler |
|||
# echo 1 > /sys/block/sda/queue/iosched/fifo_batch |
|||
</nowiki></pre> |
|||
All the other options for the scheduler can be displayed with the command |
|||
<pre><nowiki> |
|||
# cat /sys/block/sda/queue/scheduler |
|||
</nowiki></pre> |
|||
but usually `noop` and `deadline` are the 2 that works well with SDD. |
|||
To make permanent this change, add the `elevator=deadline ` at the end of the kernel line in /boot/menu/grub.conf |
|||
== System == |
|||
In `/etc/sysctl.conf` set the vualue |
|||
<pre><nowiki> |
|||
kernel.shmmax = 63554432 |
|||
</nowiki></pre> |
|||
to increase ''Maximum shared segment''. |
|||
== Boot == |
|||
Reduce boot time passing the known values to the kernel, the site that references. |
|||
Optimizations can be found at [[[Media:centos-optimization$embedded_linux_optimizations.pdf|Embedded|Linux Optimizations]]] |
|||
<pre><nowiki> |
|||
# 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 Bashlinux |
|||
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 |
|||
</nowiki></pre> |
|||
==== 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` |
|||
Latest revision as of 22:26, 6 June 2015
Redirect to:
