[Optimus One, P500 Android Development] ungaze:
SD Tweakz v2

Only works on custom ROMs with init.d(aka busybox runparts) support

UPDATED 04/11/11(added a few battery tweaks)

Wondering around on XDA will sometimes lead you to threads with scripts/tweaks that may or may not help you improve your android device in one way or another. Now most of these scripts/tweaks are not boot resistant. Meaning, after rebooting the tweaks gets disabled and you need to enter/execute them once again.

Well here's another script that would help you initialize those scrips/tweaks every time you restart/reboot you phone and make your life a lot more easier.

Instructions / How does it work?

1. Download the initial script here (SD Tweakz v2)

2. Flash via recovery This will install/copy the initial script into a portion of your android system which initializes/runs every time the phone boots

3. Create a folder on SD called "scriptz" (/sdcard/scriptz)

4. Place your tweaks/scripts inside "scriptz" folder. Usefull scripts/tweaks with explanation below

5. Reboot and see your script run on boot time By this point, every time you boot, the initial script will check your sdcard(/sdcard/sctiptz) if any scripts/tweaks are present. Once found it will then run the scripts for you each and every time you boot

What is it good for

Well there are lots of tweaks out there just waiting to be discovered. Some can yield great performance and some can provide you with a better battery management that can extend your battery life for hours. Unfortunately, some tweaks can only give you one of the benefits above and a bad performance on the other. Meaning you just can't have 'em all. Here you can choose which tweaks/scripts to apply, modify the values as you want as well as debugging which script provides the benefits that you expect. Another reason for using this mod is compatibility as some tweaks/scripts can be ROM dependent. Most of the time it's a kernel issue but some libraries can get involved too.

The Scripts

Scripts are just plain linux compliant text document which has certain linux commands that can be issued using adb/terminal.

You can make one yourself using some android text editors(from es file explorer, dropbox, root explorer etc.). Don't forget to add a ".sh" file extension.

Here's a few example of the scripts I use:

#These scripts are from various sources from different sites including [URL="http://forum.samdroid.net/"]Samdroid.net[/URL]
#And of course in collaboration with FranciscoFranco
#
#My approach in the scripts/tweaks that I use is basically just to
#squeeze more juice out of my phone. So in contrast to the tweaks
#included in FranciscoFranco's thread, the tweaks/scripts I use are less
#aggressive in terms of performance and more inclined to save battery.
#

#non-rotational.sh
#this script tells android that you are not using spinning disks
DM=`ls -d /sys/block/dm*`;
MTD=`ls -d /sys/block/mtd*`;
LOOP=`ls -d /sys/block/loop*`;
RAM=`ls -d /sys/block/ram*`;

for j in $DM $MTD $LOOP $RAM;
do
echo 0 > $j/queue/rotational;
done

#noatime.sh
#Remount all partitions with noatime, for more info visit [URL="http://xdaforums.com/showpost.php?p=8708125&postcount=1"]http://xdaforums.com/showpost.php?p=8708125&postcount=1[/URL]
for k in $(busybox mount | grep relatime | cut -d " " -f3)
do
sync
busybox mount -o remount,noatime $k
done

#scheduler.sh
#Changes the scheduler used by the system, for more info visit [URL="http://xdaforums.com/showpost.php?p=4806456&postcount=1"]http://xdaforums.com/showpost.php?p=4806456&postcount=1[/URL]
for i in `busybox ls -1 /sys/block/mtdblock*`
do
echo "noop" > $i/queue/scheduler;
done

echo "noop" > /sys/block/mmcblk0/queue/scheduler;
echo "noop" > /sys/block/dm-0/queue/scheduler;
echo "noop" > /sys/block/dm-1/queue/scheduler;

#setprop.sh (currently testing)
#various build.prop settings
setprop wifi.supplicant_scan_interval 600

These are few of the tweaks that I have tested(and using right now), I will update it every time I test something out and will eventually add some of FranciscoFranco's tweaks for you to try out.

You can get some useful scripts from here - Performance and battery tweaks - by Franciscofranco (just read along)

Note: These scripts are no different from the scripts in FranciscoFranco's thread, I just categorized each individual tweaks and separated them for you to be able to apply each one separately. I will be more inclined to describe only battery saving tweaks as I am only interested with tweaks that could extend battery life(this includes performance tweaks that doesn't seem to affect the battery behavior at all)

Here's the my initial script again: SD Tweakz v2

Here's the downloadable version of each tweak mentioned above:

non-rotational.sh

scheduler.sh

noatime.sh

setprop.sh

If anything bad happens, just flash this Undo.zip(unsigned so just toggle signature verification) and everything should be back as it was before.

Huge thanks to NervGaz for providing a solution to the mount point conflict issue and of course Franciscofranco for those lively discussions and ideas we exchange.