Centos-optimization: Difference between revisions
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#REDIRECT [[CentOS optimizations]] |
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__NOTITLE__ |
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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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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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/customswap swap swap defaults 0 0 |
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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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tune2fs -o +journal_data_writeback /dev/hda1 |
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==== commit=120 ==== |
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Set the time to sync data and metadata. |
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== Solid State Disk == |
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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: |
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# echo deadline > /sys/block/sda/queue/scheduler |
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# echo 1 > /sys/block/sda/queue/iosched/fifo_batch |
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All the other options for the scheduler can be displayed with the command |
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# cat /sys/block/sda/queue/scheduler |
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but usually <code>noop</code> and <code>deadline</code> are the 2 that works well with SDD. |
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To make permanent this change, add the <code>elevator=deadline</code> at the end of the kernel line in <tt>/boot/menu/grub.conf</tt> |
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== System == |
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In <tt>/etc/sysctl.conf</tt> set the vualue |
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kernel.shmmax = 63554432 |
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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. |
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Optimizations can be found at [[[Media:centos-optimization$embedded_linux_optimizations.pdf | Free Electrons - Embedded Linux Optimizations]]] |
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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 Bashlinux |
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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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==== lpj ==== |
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Loops per jiffy can be obtained from <tt>/var/log/messages</tt> |
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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 <tt>stdout</tt> |
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Latest revision as of 22:26, 6 June 2015
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