maemo.org - Talk - How to set swappiness?

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- - How to set swappiness? (https://talk.maemo.org/showthread.php?t=48966)

Re: How to set swappiness?

Quote:

Originally Posted by matthew maude (Post 813085)

its easier to use vi editor for this, run

sudo gainroot

vi /etc/init.d/rcS

scroll down to 263/281

press the letter i - don't press enter after

it looks like this
echo 100 > /proc/sys/vm/swappiness

use the arrows to move the cursor and change the value to 30 or whatever you want - keep it above 30 tho

then press the onscreen 'esc' button

then type this

:wq

then hit enter

Or move the curser till it's over the 1 in 100 and press rw (replace word), enter 30, then esc, and then :wq ;)

There's a reason for creating a new event.d script though (I also edited rcS at first).

Re: How to set swappiness?

Quote:

Originally Posted by DrWilken (Post 813244)

Or move the curser till it's over the 1 in 100 and press r (replace), enter 30, then esc, and then :wq ;)

There's a reason for creating a new event.d script though (I also edited rcS at first).

ah, didn't know that
i'm so new to linux that i only found out about vi a few days ago whilst trying to add aliases to root/.profile
and i only found out cos i overwrote the damn file and lost the ability to run any apt command or do a reboot
learning something new every day tho :D

Re: How to set swappiness?

Google for Vi Cheat Sheet... ;)

Oh, and have a nice journey... :cool:

Re: How to set swappiness?

what about that:

HTML Code:

# my rcS.e fix



start on started rcS-late



script

       echo 30 > /proc/sys/vm/swappiness

       echo 0 > /proc/sys/vm/page-cluster

       echo 1 > /proc/sys/vm/laptop_mode

       echo 1 > /proc/sys/vm/oom_kill_allocating_task

       echo 0 > /proc/sys/vm/dirty_expire_centisecs

       echo 0 > /proc/sys/vm/dirty_writeback_centisecs

       echo 60 > /proc/sys/vm/dirty_background_ratio

       echo 95 > /proc/sys/vm/dirty_ratio

       echo 0 > /proc/sys/net/ipv4/tcp_timestamps

       echo 1 > /proc/sys/net/ipv4/tcp_no_metrics_save

end script

Re: How to set swappiness?

Quote:

Originally Posted by kaze.daniel (Post 815333)

what about that:

HTML Code:

# my rcS.e fix



start on started rcS-late



script

       echo 30 > /proc/sys/vm/swappiness

       echo 0 > /proc/sys/vm/page-cluster

       echo 1 > /proc/sys/vm/laptop_mode

       echo 1 > /proc/sys/vm/oom_kill_allocating_task

       echo 0 > /proc/sys/vm/dirty_expire_centisecs

       echo 0 > /proc/sys/vm/dirty_writeback_centisecs

       echo 60 > /proc/sys/vm/dirty_background_ratio

       echo 95 > /proc/sys/vm/dirty_ratio

       echo 0 > /proc/sys/net/ipv4/tcp_timestamps

       echo 1 > /proc/sys/net/ipv4/tcp_no_metrics_save

end script

Just add first 4 lines to be in sync with coding standards:

Code:

description "it is my own N900 tuning"

author "YourName"



console output

instead of ugly line started from # (sorry for that). And please - enclose any numeric value before '>' sign into double-quotes like

echo "95" > /proc/sys/vm/dirty_ratio

It could not expose you to very common bug - the sequence like '95>' without space has a special meaning in shell.

Note: I didn't evaluate the effect of that "echo" commands.

Re: How to set swappiness?

For an explanation of these settings and values see http://www.knownokia.ca/2010/08/n900...-and-more.html

FWIW, I'm gonna try them out next days.

Re: How to set swappiness?

I have a long time ago made a script that sets swappiness to 100 it is on the garage it is called "seatbelt" install the script will set swappines at startup.
whether this is a good thing to do i do not know. It worked great on the 770

Re: How to set swappiness?

To save users the time of searching, It's here ...

Using the seat belts read me file, I'm guessing we have to do this?

As root.
Copy the script to /etc/init.d
Change script mode to executable
Create this symbolic link using this command:

ln -s /etc/init.d/<Script Name> /etc/rc2.d/S80seatbelt"

Reboot

And

To reverse changes, remove the link and script...

So basically all we need to do is create a sym link to a script for it to run on start up?

Re: How to set swappiness?

Quote:

Originally Posted by SavageD (Post 815382)

Ehm...

Quote:

# swappiness can be set from 1 to 100
echo 100 > /proc/sys/vm/swappiness
echo 2 > /proc/sys/vm/overcommit_memory
echo 40 > /proc/sys/vm/overcommit_ratio

:confused:

No need for fugly sysvinit junk.

On Maemo 5 just put in /etc/event.d/tuning

Code:

description "N900 tuning"

author "VA"



console output



start on started rcS-late



script

       echo "30" > /proc/sys/vm/swappiness

       echo "0" > /proc/sys/vm/page-cluster

       echo "1" > /proc/sys/vm/laptop_mode

       echo "1" > /proc/sys/vm/oom_kill_allocating_task

       echo "0" > /proc/sys/vm/dirty_expire_centisecs

       echo "0" > /proc/sys/vm/dirty_writeback_centisecs

       echo "60" > /proc/sys/vm/dirty_background_ratio

       echo "95" > /proc/sys/vm/dirty_ratio

       echo "0" > /proc/sys/net/ipv4/tcp_timestamps

       echo "1" > /proc/sys/net/ipv4/tcp_no_metrics_save

end script

For explanation of each of these settings see URL in my previous post.

Re: How to set swappiness?

Quote:

Originally Posted by kaze.daniel (Post 815333)

what about that:

HTML Code:

# my rcS.e fix



start on started rcS-late



script

       echo 30 > /proc/sys/vm/swappiness

       echo 0 > /proc/sys/vm/page-cluster

       echo 1 > /proc/sys/vm/laptop_mode

       echo 1 > /proc/sys/vm/oom_kill_allocating_task

       echo 0 > /proc/sys/vm/dirty_expire_centisecs

       echo 0 > /proc/sys/vm/dirty_writeback_centisecs

       echo 60 > /proc/sys/vm/dirty_background_ratio

       echo 95 > /proc/sys/vm/dirty_ratio

       echo 0 > /proc/sys/net/ipv4/tcp_timestamps

       echo 1 > /proc/sys/net/ipv4/tcp_no_metrics_save

end script

I've switched to this script from the 15 swappiness I had previously and I noticed a significant speed boost! Thanks!