Difference between revisions of "Centos-optimization"
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+ | #REDIRECT [[CentOS optimizations]] |
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− | __NOTOC__ |
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− | = CentOS Optimizations = |
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− | == Disk == |
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− | In order to speedup the disk management, some values are added to each `ext3` partition on the terminal. |
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− | The reference site is located at [http://wiki.centos.org/HowTos/Disk_Optimization] |
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− | |||
− | <pre><nowiki> |
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− | LABEL=/ / ext3 defaults,noatime,data=writeback,commit=120 1 1 |
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− | tmpfs /dev/shm tmpfs defaults 0 0 |
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− | devpts /dev/pts devpts gid=5,mode=620 0 0 |
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− | sysfs /sys sysfs defaults 0 0 |
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− | proc /proc proc defaults 0 0 |
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− | /hpswap swap swap defaults 0 0 |
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− | </nowiki></pre> |
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− | |||
− | |||
− | ==== noatime ==== |
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− | Don't write access time |
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− | |||
− | ==== data=writeback ==== |
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− | 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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− | |||
− | <pre><nowiki> |
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− | tune2fs -o +journal_data_writeback /dev/hda1 |
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− | </nowiki></pre> |
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− | |||
− | ==== commit=120 ==== |
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− | Set the time to sync data and metadata. |
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− | |||
− | = System = |
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− | In `/etc/sysctl.conf` set the vualue |
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− | |||
− | <pre><nowiki> |
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− | kernel.shmmax = 63554432 |
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− | </nowiki></pre> |
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− | |||
− | to increase ''Maximum shared segment''. |
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− | |||
− | == Boot == |
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− | 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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− | |||
− | <pre><nowiki> |
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− | # grub.conf generated by anaconda |
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− | # |
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− | # Note that you do not have to rerun grub after making changes to this file |
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− | # NOTICE: You do not have a /boot partition. This means that |
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− | # all kernel and initrd paths are relative to /, eg. |
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− | # root (hd0,0) |
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− | # kernel /boot/vmlinuz-version ro root=/dev/hda1 |
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− | # initrd /boot/initrd-version.img |
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− | #boot=/dev/hda |
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− | default=0 |
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− | timeout=0 |
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− | splashimage=(hd0,0)/boot/grub/splash.xpm.gz |
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− | hiddenmenu |
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− | password --md5 $1$/omJBwhD$phlKUXHDZI6BMLkNSfNgD/ |
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− | title uWink |
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− | root (hd0,0) |
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− | kernel /boot/vmlinuz-2.6.18-53.el5 ro root=LABEL=/ rhgb vga=792 lpj=998235 reboot=soft quiet |
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− | initrd /boot/initrd-2.6.18-53.el5.img |
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− | </nowiki></pre> |
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− | |||
− | ==== lpj ==== |
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− | Loops per jiffy can be obtained from `/var/log/messages` |
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− | |||
− | ==== reboot=soft ==== |
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− | When reboots, the firmware will be skipped. |
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− | |||
− | ==== quiet ==== |
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− | Doesn't log all the boot messages to the `stdout` |
Latest revision as of 22:26, 6 June 2015
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