How to optimize Ubuntu 9.04 (ext4) for SSD?

In a fedora forum, I found this list for SSD-optimalization. I've just baught a new laptop with a Kingston 80GB SSD (which is a rebranded Intel X25-M), and plan to install Ubuntu on it. Im going to run dual boot with W7 for games.
What I understand so far, is that I should use ext4 without journaling, and that I should do some other tweaks.
The question is: Which parts of this list should I do, What needs to be changed in order for it to work in Ubuntu, What can I skip, and is there anything else I should do?

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SSD Optimization
Perform the following if you’re using an SSD. If you’re using a hard drive you can skip this section.
Create Ramdisks to Store Frequently Written Areas

1. Edit your /etc/fstab file. Add the following lines.
tmpfs /var/log tmpfs defaults 0 0
tmpfs /tmp tmpfs defaults 0 0
tmpfs /var/tmp tmpfs defaults 0 0

Disable Access Time Attributes

1. Edit your /etc/fstab. Modify the root partitions settings. Add noatime and nodiratime to defaults.
/dev/sda2 / ext4 defaults,noatime,nodiratime 0 0

Optimizing the Kernel

1. Add the following to your /etc/rc.local file.
# Economize the SSD
sysctl -w vm.swappiness=1 # Strongly discourage swapping
sysctl -w vm.vfs_cache_pressure=50 # Don't shrink the inode cache aggressively

# As in the rc.last.ctrl of Linpus
echo ondemand > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
echo ondemand > /sys/devices/system/cpu/cpu1/cpufreq/scaling_governor
cat /sys/devices/system/cpu/cpu0/cpufreq/ondemand/sampling_rate_max > /sys/devices/system/cpu/cpu0/cpufreq/ondemand/sampling_rate

echo 1500 > /proc/sys/vm/dirty_writeback_centisecs
echo 20 > /proc/sys/vm/dirty_ratio
echo 10 > /proc/sys/vm/dirty_background_ratio

echo 1 > /sys/devices/system/cpu/sched_smt_power_savings
echo 10 > /sys/module/snd_hda_intel/parameters/power_save
echo 5 > /proc/sys/vm/laptop_mode

#Decrease power usage of USB while idle
[ -w /sys/bus/usb/devices/1-5/power/level ] && echo auto > /sys/bus/usb/devices/1-5/power/level
[ -w /sys/bus/usb/devices/5-5/power/level ] && echo auto > /sys/bus/usb/devices/5-5/power/level

/sbin/setpci -d 197b:2381 AE=47
/sbin/modprobe pciehp
/sbin/modprobe sdhci

Change the I/O Scheduler

1. Edit the /etc/grub.conf file. Add “elevator=noop” to the kernel line.
kernel /vmlinuz-2.6.27.5-117.fc10.i686 ro root=/dev/sda

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Source: http://forums.fedoraforum.org/showthread.php?t=215109

I've run Ubuntu for a year now, but I'm still not completely sure on commands.

Thank you.

i would also want to know this,, i just bough an ssd, and installing in it soon.
i also read about partition aligning, does any1 know anything abou thtis? and how to do it?

Sam

>1. Edit your /etc/fstab file. Add the following lines.
>tmpfs /var/log tmpfs defaults 0 0
>tmpfs /tmp tmpfs defaults 0 0
>tmpfs /var/tmp tmpfs defaults 0 0

If you're going to put all your log files in tmpfs to prevent writing to the SSD, you might as well put your ~/.xsession-errors in tmpfs too.

One way to do this, is to move .xsession-errors to /tmp (which is in tmpfs if use the settings above):

$ sudo chown root:root .xsession-errors
$ sudo chattr +i .xsession-errors

This will effectively create a new (randomly named) .xsession-errors file in /tmp because the default $HOME/.xsession-errors is no longer writeable.

Works for me :-)

/Sune

I know this thread is not the latest but I would recommend checking the following from the OCZ forum:

http://www.ocztechnologyforum.com/fo...ighlight=linux

It is very technical but I set up my SSD with Ubuntu 9.04 accordingly and I must say it runs a lot faster than my velociraptor on a desktop.
Had no problems so far.
Good luck.

Do any of these tweaks apply to Karmic beta?

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Originally Posted by elgilicious

Do any of these tweaks apply to Karmic beta?

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Most of these tweaks are pretty "generic", such as moving temporary files and logs to tmpfs (in ram) instead of ssd so they would apply to any linux distro.

/Sune

It is clear that /var/tmp should not be in tmpfs since by definition it's content needs to be preserved beyond reboots:
http://linuxers.org/article/differen...tmp-and-vartmp

Very old thread so closed.