[Sony Xperia P, U, Sola, Go] kurotsugi:
if you have time, you can rewrite all the stuff by yourself to avoid double typed script with different value. its easy but need a lil more patience. I'll try to give quick explanation. our tweaks mostly work via init.d script. the basic structure will be.

#!/system/bin/sh --> the header. tell the system to use "sh" command on the script below

echo bla bla bla. --> the script

I'll differentiate the scripts into two parts. the one run a bash script and the one used to change our device setting. the first one is quite complicated and usually written on separated file. the famous one might be zipalign script and sqlite script. basicly you only need to add the script and the required files (the libs and the binary file in /system/bin) into your system and need no modification. just add and leave it.

the second part is the one used to change our device setting. we can differentiate this stuff into two things. the setprop stuff and the "other stuff". the setprop stuff is quite easy to use. the setprop stuff basic form is "setprop <key> <value>" for an example:

setprop ro.ril.enable.dtm 1
setprop ro.ril.gprsclass 10
setprop ro.ril.hep 1
setprop ro.ril.enable.3g.prefix 1
setprop ro.ril.hsdpa.category 8
setprop ro.ril.hsupa.category 6
setprop ro.ril.hsxpa 2
setprop ro.ril.enable.a53 1

some of these script written in form of "setprop ro.ril.hep=1". that's the wrong way. the correct way is as I've described above.

the second part, the "other stuff" work in three different way. for an example, look at these files

/proc/sys/kernel/shmmni
/proc/sys/kernel/shmmax
/proc/sys/kernel/shmall

these files have certain value on it. if we want to change the value written on it, we can use three different way.

1. use "sysctl -w <key>=<value>" form. in your init.d script you'll type

sysctl -w kernel.shmmni=4096
sysctl -w kernel.shmmax=268435456
sysctl -w kernel.shmall=2097152

2. use sysctl.conf file. in your sysctl.conf file, you'll write

kernel.shmmni=4096
kernel.shmmax=268435456
kernel.shmall=2097152

while in your init.d script you'll write "sysctl -p".

personally I prefer the number 1 since I can made a simple test to check whether if the script is running or not and add it into my log files. anyway, these trick only work for the files under /proc/sys. if you want to change the value of different files, you'll need to use method number 3.

3. use echo command. the form is "echo "<value>" > /path/to/file". in your init.d you'll write

echo "0" > /sys/module/lowmemorykiller/parameters/debug_level
echo "64" > /sys/module/lowmemorykiller/parameters/cost
echo "0,1,3,5,7,15" > /sys/module/lowmemorykiller/parameters/adj
echo "4096,5182,6400,15360,17920,20480" > /sys/module/lowmemorykiller/parameters/minfree

to avoid double typed script, we can categorize our tweak into several group. I'll show you my tweak as an example. you can learn it or start with it. I don't take credits, so that you can modify it anytime without asking my permission.

#!/system/bin/sh
# kuro tweak1: the echo stuff
# copyright@mycat (2012) - lol...i'm just joking. no copyright or whatsoever
# contact : kaze.noichi17@gmail.com

# v.1 - first release
# v.1.1 - new log system and new tweak added.
# v.1.2 - new tweak for xperia
# v.1.3(4-11-12) - new form

LOG_FILE=/data/kuro_tweak1.log
LOG_FILEZ=/data/kuro_sqlite.log
if [ -e $LOG_FILE ]; then
rm $LOG_FILE;
fi;

if [ -e $LOG_FILEZ ]; then
rm $LOG_FILEZ;
fi;

# the preface
echo "==========================
# TWEAK KURO1-LOG FILE #
==========================
in the name of Allah,
the most beneficent,
the most mercifull
==========================
system information:
vendor : $( getprop ro.product.brand )
model : $( getprop ro.product.model )
ROM : $( getprop ro.build.display.id )

running the script...
start at:
$( date +"%m-%d-%Y %H:%M:%S" )
==========================" | tee -a $LOG_FILE;

# perfect mount
mount -o remount,noatime,commit=500,noauto_da_alloc,barrier=0 /system /system;
mount -o remount,noatime,commit=500,noauto_da_alloc,barrier=0 /data /data;
mount -o remount,noatime,commit=500,noauto_da_alloc,barrier=0 /cache /cache;
echo "perfect mount---------[OK]" | tee -a $LOG_FILE;

# sdcard speed fix
# not working yet - need root permission to change these value
if [ -e /sys/devices/virtual/bdi/179:0/read_ahead_kb ]; then
busybox echo "2048" > /sys/devices/virtual/bdi/179:0/read_ahead_kb
busybox echo "2048" > /sys/devices/virtual/bdi/179:32/read_ahead_kb
echo "sdcard speed fix------[OK]
-value set to $( cat /sys/devices/virtual/bdi/179:0/read_ahead_kb )
-value set to $( cat /sys/devices/virtual/bdi/179:32/read_ahead_kb )" | tee -a $LOG_FILE; else
echo "sdcard speed fix----[FAIL]" | tee -a $LOG_FILE;
fi

# kernel kick
sysctl -w kernel.shmmni=4096
sysctl -w kernel.shmmax=268435456
sysctl -w kernel.shmall=2097152
sysctl -w kernel.msgmni=4096
sysctl -w kernel.msgmax=64000
# sysctl -w kernel.sched_latency_ns=20000000
# sysctl -w kernel.sched_wakeup_granularity_ns=2500000
# sysctl -w kernel.sched_min_granularity_ns=10000000
sysctl -w kernel.sem="500 512000 64 2048"
sysctl -w kernel.panic=30
sysctl -w kernel.panic_on_oops=0
sysctl -w kernel.threads-max=10000
sysctl -w kernel.panic=30
# sysctl -w kernel.sched_compat_yield=1
# sysctl -w kernel.sched_shares_ratelimit=256000
sysctl -w kernel.ctrl-alt-del=0
sysctl -w fs.lease-break-time=10
sysctl -w fs.file-max=65536
echo "kernel kick-----------[OK]" | tee -a $LOG_FILE;

# OOM
sysctl -w vm.laptop_mode=0
sysctl -w vm.swappiness=40
sysctl -w vm.dirty_writeback_centisecs=3000
sysctl -w vm.dirty_expire_centisecs=500
sysctl -w vm.dirty_ratio=15
sysctl -w vm.dirty_background_ratio=10
sysctl -w vm.lowmem_reserve_ratio="100 100"
sysctl -w vm.overcommit_ratio=70
sysctl -w vm.highmem_is_dirtyable=1
sysctl -w vm.min_free_order_shift=4
sysctl -w vm.oom_kill_allocating_task=0
sysctl -w vm.panic_on_oom=0
sysctl -w vm.page-cluster=3
sysctl -w vm.drop_caches=3
sysctl -w vm.min_free_kbytes=5120
sysctl -w vm.vfs_cache_pressure=50
sysctl -w vm.block_dump=0
echo "memory management-----[OK]" | tee -a $LOG_FILE;

# network boost
sysctl -w net.ipv4.tcp_congestion_control=cubic
sysctl -w net.ipv4.tcp_timestamps=0
sysctl -w net.ipv4.tcp_tw_reuse=1
sysctl -w net.ipv4.tcp_sack=1
sysctl -w net.ipv4.tcp_dsack=1
sysctl -w net.ipv4.tcp_tw_recycle=1
sysctl -w net.ipv4.tcp_window_scaling=1
sysctl -w net.ipv4.tcp_keepalive_probes=5
sysctl -w net.ipv4.tcp_keepalive_intvl=30
sysctl -w net.ipv4.tcp_fin_timeout=30
sysctl -w net.ipv4.tcp_moderate_rcvbuf=1
sysctl -w net.ipv4.tcp_max_tw_buckets=1440000
sysctl -w net.ipv4.tcp_mem="57344 57344 524288"
sysctl -w net.ipv4.tcp_synack_retries=2
sysctl -w net.ipv4.tcp_syn_retries=2
sysctl -w net.ipv4.tcp_max_syn_backlog=1024
sysctl -w net.ipv4.icmp_echo_ignore_all=1
sysctl -w net.ipv4.route/flush=1
sysctl -w net.ipv4.udp_rmem_min=6144
sysctl -w net.ipv4.udp_wmem_min=6144
sysctl -w net.ipv4.tcp_rfc1337=1
sysctl -w net.ipv4.ip_no_pmtu_disc=0
sysctl -w net.ipv4.tcp_ecn=0
sysctl -w net.ipv4.tcp_wmem="6144 87380 524288"
sysctl -w net.ipv4.tcp_rmem="6144 87380 524288"
sysctl -w net.ipv4.tcp_fack=1
sysctl -w net.ipv4.tcp_synack_retries=2
sysctl -w net.ipv4.tcp_syn_retries=2
sysctl -w net.ipv4.tcp_no_metrics_save=1
sysctl -w net.ipv4.tcp_keepalive_time=1800
sysctl -w net.ipv4.ip_forward=0
sysctl -w net.ipv4.ip_dynaddr=0
sysctl -w net.ipv4.conf.all.accept_source_route=0
sysctl -w net.ipv4.conf.all.accept_redirects=0
sysctl -w net.ipv4.conf.all.rp_filter=1
sysctl -w net.ipv4.conf.all.secure_redirects=0
sysctl -w net.ipv4.conf.default.accept_redirects=0
sysctl -w net.ipv4.conf.default.secure_redirects=0
sysctl -w net.ipv4.conf.default.accept_source_route=0
sysctl -w net.core.rmem_max=524288
sysctl -w net.core.wmem_max=524288
sysctl -w net.core.rmem_default=262144
sysctl -w net.core.wmem_default=262144
sysctl -w net.core.optmem_max=20480
sysctl -w net.core.netdev_max_backlog=25000
sysctl -w net.unix.max_dgram_qlen=50
echo "network boost---------[OK]" | tee -a $LOG_FILE;

# cleaner
busybox rm -f /data/anr/*.*
busybox rm -f /data/cache/*.*
busybox rm -f /data/local/log/*.*
busybox rm -f /data/local/tmp/*.*
busybox rm -f /data/last_alog/*
busybox rm -f /data/last_kmsg/*
busybox rm -f /data/mlog/*
busybox rm -f /data/tombstones/*
busybox rm -f /data/system/dropbox/*
chmod 400 /data/system/dropbox
busybox rm /dev/log/main
busybox rm -f /data/system/usagestats/*
busybox chmod 400 /data/system/usagestats

export sampling_rate=10000
export up_threshold=80

echo "memory cleaner--------[OK]" | tee -a $LOG_FILE;

if [ -e /data/anr/*.* ]; then
echo "-anr not cleaned" | tee -a $LOG_FILE; else
echo "-anr cleaned" | tee -a $LOG_FILE
fi;
if [ -e /data/local/tmp/*.* ]; then
echo "-local/tmp not cleaned" | tee -a $LOG_FILE; else
echo "-local/tmp cleaned" | tee -a $LOG_FILE
fi;
if [ -e /data/cache/*.* ]; then
echo "-cache not cleaned" | tee -a $LOG_FILE; else
echo "-cache cleaned" | tee -a $LOG_FILE
fi;
if [ -e /data/last_log/*.* ]; then
echo "-log not cleaned" | tee -a $LOG_FILE; else
echo "-log cleaned" | tee -a $LOG_FILE
fi;
if [ -e /data/tombstones/*.* ]; then
echo "-tombstones not cleaned" | tee -a $LOG_FILE; else
echo "-tombstones cleaned" | tee -a $LOG_FILE
fi;

# minfree
echo "64" > /sys/module/lowmemorykiller/parameters/cost
echo "0,1,3,5,7,15" > /sys/module/lowmemorykiller/parameters/adj
echo "4096,5182,6400,15360,17920,20480" > /sys/module/lowmemorykiller/parameters/minfree
echo "minfree setting-------[OK]
-minfree value
$( cat /sys/module/lowmemorykiller/parameters/adj )
$( cat /sys/module/lowmemorykiller/parameters/minfree )" | tee -a $LOG_FILE;

# end
echo "==========================
done at:
$( date +"%m-%d-%Y %H:%M:%S" )
all praise is due to Allah
==========================
-- have a nice day --
kurotsugi@xda
==========================" | tee -a $LOG_FILE;

note that the line started with # are not executed.

#!/system/bin/sh
# kuro tweak2: the setprop stuffs and journalismoff
# copyright@mycat (2012) - lol...i'm just joking. no copyright or whatsoever
# contact : kaze.noichi17@gmail.com

# v.1 - first release
# v.1.1 - new log system and new tweak added.
# v.1.2 - new tweak for xperia

LOG_FILE=/data/kuro_tweak2.log
if [ -e $LOG_FILE ]; then
rm $LOG_FILE;
fi;

# the preface
echo "==========================
# TWEAK KURO2-LOG FILE #
==========================
in the name of Allah,
the most beneficent,
the most mercifull
==========================
system information:
vendor : $( getprop ro.product.brand )
model : $( getprop ro.product.model )
ROM : $( getprop ro.build.display.id )

running the script...
start at:
$( date +"%m-%d-%Y %H:%M:%S" )
==========================" | tee -a $LOG_FILE;

# 3g mod
setprop ro.ril.enable.dtm 1
setprop ro.ril.gprsclass 10
setprop ro.ril.hep 1
setprop ro.ril.enable.3g.prefix 1
setprop ro.ril.hsdpa.category 8
setprop ro.ril.hsupa.category 6
setprop ro.ril.hsxpa 2
setprop ro.ril.enable.a53 1
setprop ro.ril.htcmaskw1.bitmask 4294967295
setprop ro.ril.htcmaskw1 14449
setprop ro.config.hw_fast_dormancy 1
echo "3g signal mod---------[OK]" | tee -a $LOG_FILE;

# battery mod n media
setprop debug.performance.tuning 1
setprop pm.sleep_mode 1
setprop windowsmgr.max_events_per_sec 90
setprop ro.ril.disable.power.collapse 0
setprop wifi.supplicant_scan_interval 180
setprop ro.media.enc.jpeg.quality 100
setprop debug.sf.hw 1
setprop ro.vold.umsdirtyratio 20
echo "battery n media-------[OK]" | tee -a $LOG_FILE;

# performance
# setprop persist.sys.purgeable_assets 1
setprop dalvik.vm.execution-mode int:jit
setprop dalvik.vm.dexopt-flags l=x,n=z,m=y
setprop dalvik.vm.verify-bytecode false
setprop dalvik.vm.heapsize 64m
setprop dalvik.vm.heapgrowthlimit 48m
setprop dalvik.vm.dexopt-data-only 1
setprop dalvik.vm.jmiopts forcecopy
setprop dalvik.vm.lockprof.treshold 250
setprop ro.kernel.android.checkjni 0
setprop ro.telephony.call_ring.delay 0
setprop debug.kill_allocating_task 1
# defaul is zero

# mem adj
setprop ro.FOREGROUND_APP_ADJ 0
setprop ro.VISIBLE_APP_ADJ 4
setprop ro.SECONDARY_SERVER_ADJ 6
setprop ro.HIDDEN_APP_MIN_ADJ 8
setprop ro.CONTENT_PROVIDER_ADJ 12
setprop ro.EMPTY_APP_ADJ 15

# mem minfree
setprop ro.FOREGROUND_APP_MEM 1536
setprop ro.VISIBLE_APP_MEM 2048
setprop ro.SECONDARY_SERVER_MEM 4096
setprop ro.HIDDEN_APP_MEM 5120
setprop ro.CONTENT_PROVIDER_MEM 5632
setprop ro.EMPTY_APP_MEM 6144
echo "performance-----------[OK]" | tee -a $LOG_FILE;

# Disable debugging notify icon on statusbar
setprop persist.adb.notify 0

# Disable blackscreen issue after a call
setprop ro.lge.proximity.delay 0
setprop mot.proximity.delay 0

# Phone will not wake up from hitting the volume rocker
# setprop ro.config.hwfeature_wakeupkey 0

# Enable display Dithering
# setprop persist.sys.use_dithering 1

# xperia mental
setprop persist.android.strictmode 0
setprop persist.sys.ui.hw 1
setprop ro.max.fling_velocity 12000
setprop ro.min.fling_velocity 2000
setprop ro.mot.eri.losalert.delay 1000
setprop ro.kernel.checkjni 0
setprop ro.config.nocheckin 1
setprop debug.qctwa.statusbar 1
setprop debug.qctwa.preservebuf 1
setprop debug.qc.hardware true
setprop com.qc.hardware true
setprop profiler.force_disable_err_rpt 1
setprop profiler.force_disable_ulog 1
setprop logcat.live disable
setprop net.ppp0.dns1 8.8.8.8
setprop net.ppp0.dns2 8.8.4.4
setprop net.dns1 8.8.8.8
setprop net.rmnet0.dns1 8.8.8.8
setprop net.rmnet0.dns2 8.8.4.4
setprop net.dns2 8.8.4.4
setprop debug.egl.profiler 1
setprop debug.egl.hw 1
setprop debug.composition.type gpu
echo "Xperia tweak----------[OK]" | tee -a $LOG_FILE;

# no journal
tune2fs -o journal_data_writeback /dev/block/mmcblk0p10
tune2fs -o journal_data_writeback /dev/block/mmcblk0p11
tune2fs -o journal_data_writeback /dev/block/mmcblk0p15
echo "no journal------------[OK]" | tee -a $LOG_FILE;

# end
echo "==========================
done at:
$( date +"%m-%d-%Y %H:%M:%S" )
all praise is due to Allah
==========================
-- have a nice day --
kurotsugi@xda
==========================" | tee -a $LOG_FILE;

the journalism stuff require tune2fs binary file installed into your system.

#!/system/bin/sh

#keep beats
PPID=$(pidof org.equalizerapp);
echo "17" > /proc/$PPID/oom_adj;
renice -18 $PPID;

#set
setprop.keep_app_1 org.equalizerapp

#audio resample
setprop af.resample 48000;
setprop af.resampler.quality 255;
setprop ro.audio.samplerate 48000;
setprop ro.audio.pcm.samplerate 48000;
setprop persyst.af.resample 48000;
setprop persyst.af.resampler.quality 255;
setprop persyst.ro.audio.samplerate 48000;
setprop persyst.ro.audio.pcm.samplerate 48000;
setprop persyst.dev.pm.dyn_samplingrate 1;

this one is modifying our sound quality. some of the part are still under my investigation but the audio resample part is really working.

#!/system/bin/sh
# DarkyROM 2011
# Much faster zipalign.

# Changelog:
# 1.3 (5/8/12) new log system. system remount deleted (by: kurotsugi)
# 1.2 (17/1/11) Added /data/zipalign.db file for faster apk check (ninpo,Bo$s)
# 1.1 (12/1/09) Switched to zipalign -c 4 to check the apk instead of MD5 (oknowton)
# 1.0 (11/30/09) Original

LOG_FILE=/data/kuro_zalign.log
ZIPALIGNDB=/data/kuro_zalign.db

if [ -e $LOG_FILE ]; then
rm $LOG_FILE;
fi;

if [ ! -f $ZIPALIGNDB ]; then
touch $ZIPALIGNDB;
fi;

# the preface
echo "==========================
# TWEAK KURO-ZALIGN FILE #
==========================
in the name of Allah,
the most beneficent,
the most mercifull
==========================
system information:
vendor : $( getprop ro.product.brand )
model : $( getprop ro.product.model )
ROM : $( getprop ro.build.display.id )

running the script...
start at:
$( date +"%m-%d-%Y %H:%M:%S" )
==========================" | tee -a $LOG_FILE;

# zipalign script (not modified)
for DIR in /system/app /data/app ; do
cd $DIR
for APK in *.apk ; do
if [ $APK -ot $ZIPALIGNDB ] && [ $(grep "$DIR/$APK" $ZIPALIGNDB|wc -l) -gt 0 ] ; then
echo "zipaligned: $DIR/$APK" | tee -a $LOG_FILE
else
zipalign -c 4 $APK
if [ $? -eq 0 ] ; then
echo "now zipaligned: $DIR/$APK" | tee -a $LOG_FILE
grep "$DIR/$APK" $ZIPALIGNDB > /dev/null || echo $DIR/$APK >> $ZIPALIGNDB
else
echo "Now aligning: $DIR/$APK" | tee -a $LOG_FILE
zipalign -f 4 $APK /cache/$APK
busybox mount -o rw,remount /system
cp -f -p /cache/$APK $APK
busybox rm -f /cache/$APK
grep "$DIR/$APK" $ZIPALIGNDB > /dev/null || echo $DIR/$APK >> $ZIPALIGNDB
fi
fi
done
done

touch $ZIPALIGNDB

# end
echo "==========================
done at:
$( date +"%m-%d-%Y %H:%M:%S" )
all praise is due to Allah
==========================
-- have a nice day --
kurotsugi@xda
==========================" | tee -a $LOG_FILE;

the famous zipalign script. i modify the log system. you need the zipalign binary to use it

#!/system/bin/sh
# kuro akuro: new data2sd method
# copyright@mycat (2012) - lol...i'm just joking. no copyright or whatsoever
# contact : kaze.noichi17@gmail.com

# v.1 - first release
# v.1.1 - automated system, new build,

LOG_FILE=/data/kuro_akuro.log
if [ -e $LOG_FILE ]; then
rm $LOG_FILE;
fi;

# the preface
echo "==========================
# TWEAK AKURO-LOG FILE #
==========================
in the name of Allah,
the most beneficent,
the most mercifull
==========================
system information:
vendor : $( getprop ro.product.brand )
model : $( getprop ro.product.model )
ROM : $( getprop ro.build.display.id )

running the script...
start at:
$( date +"%m-%d-%Y %H:%M:%S" )
==========================" | tee -a $LOG_FILE;

# fix sdcard speed
if [ -e /sys/devices/virtual/bdi/179:0/read_ahead_kb ]; then
echo "2048" > /sys/devices/virtual/bdi/179:0/read_ahead_kb;
echo "fix sdcard speed tweak [OK]" | tee -a $LOG_FILE;
fi;

# create sdext dir in /system
if [ ! -e /system/sd ]; then
echo "WARNING!: no sdext dir
please create dir /system/sd" | tee -a $LOG_FILE;
fi;

echo "SDEXT directory check [OK]" | tee -a $LOG_FILE;

# mount sdcard all type
busybox mount -o noatime,nodiratime,nosuid,nodev /dev/block/mmcblk0p2 /system/sd;
mountext=`busybox mount | egrep 'ext2|ext3|ext4'`;
if [ -n "$mountext" ]; then
chown 1000:1000 /system/sd;
chmod 771 /system/sd;
fi;

echo "akuro: sd-ext mount [OK]" | tee -a $LOG_FILE;

# create the directories

if [ ! -e /system/sd/app ]; then
mkdir /system/sd/app;
busybox mv /data/app/* /system/sd/app;
fi;

if [ ! -e /system/sd/dalvik-cache ]; then
mkdir /system/sd/dalvik-cache;
busybox mv /data/dalvik-cache/* /system/sd/dalvik-cache;
fi;

echo "akuro: preparation step [OK]" | tee -a $LOG_FILE;

# mount sd to data directories
mount -o bind /system/sd/app /data/app;
chown 1000:1000 /system/sd/app;
chmod 771 /system/sd/app;

if [ -e /system/sd/app ]; then
echo "akuro: app mount step [OK]" | tee -a $LOG_FILE; else
echo "akuro: app mount step [FAIL]" | tee -a $LOG_FILE;
fi;

mount -o bind /system/sd/dalvik-cache /data/dalvik-cache;
chown 1000:1000 /system/sd/dalvik-cache;
chmod 771 /system/sd/dalvik-cache;

if [ -e /system/sd/dalvik-cache ]; then
echo "akuro: dalvik mount step [OK]" | tee -a $LOG_FILE; else
echo "akuro: dalvik mount step [FAIL]" | tee -a $LOG_FILE;
fi;

if [ -e /system/sd/data ]; then
mount -o bind /system/sd/data /data/data;
chown 1000:1000 /system/sd/data;
chmod 771 /system/sd/data;
fi;

if [ -e /system/sd/data ]; then
echo "akuro: data mount step [OK]" | tee -a $LOG_FILE; else
echo "akuro: data mount step [FAIL]" | tee -a $LOG_FILE;
fi;

# end
echo "==========================
done at:
$( date +"%m-%d-%Y %H:%M:%S" )
all praise is due to Allah
==========================
-- have a nice day --
kurotsugi@xda
==========================" | tee -a $LOG_FILE;

my own made akuro script. it works to move dalvik-cache,app, and /data/folder from our internal memory to ext2/3/4 partition on our sdcard. it will save our internal mem space. sadly this one is for samsung device. you need to modify some part of it.

have a nice tweaking :P

EDIT: btw, for my first and second tweak, you should use your own value. my value is taken from sgy and still under investigation to get better result.