[TWEAK] Increasing SD Card Cache for Improve I/O Speeds

CrackUC · March 13, 2012

PHONE MUST BE ROOTED

IF ALL OF THIS IS JUST GIBBERISH TO YOU THAN DON'T DO ANY OF THIS!!!

This is a simple little tweak that will increase loading speeds and in most cases fixes all scroll lag.

There are 2 methods of doing this. Use method 2 only if the 1st one didnt work for you.

METHOD 1:

Create a simple text file with note pad and write the following code:

#!/system/bin/sh
if [ -e /sys/devices/virtual/bdi/179:0/read_ahead_kb ]
then
/system/xbin/echo "XXXX" > /sys/devices/virtual/bdi/179:0/read_ahead_kb;
fi;

NOTE: WHERE "XXXX" put you desired cache size in KB... E.G. 128 or 256 or 512 or 1024 or 2048

Next save it as anything WITHOUT a file extension, E.G. "cachefix"

Now using Root Explorer or a similar app, copy this file to "/system/etc/init.d" folder. (you may also push it across with ADB)

REBOOT

now go to Root Explorer and open "/sys/devices/virtual/bdi/179:0/read_ahead_kb" and see if its changed

METHOD 2:

If method one doesn't work you may try following code, the process is identical:

mmcfolder="/sys/devices/platform/msm_sdcc.2/mmc_host/mmc1"
cd $mmcfolder
folderlist=`ls -1`
mmcresult=`echo $folderlist | grep -o '\bmmc1:\w*' | sed 's/mmc1://'`
echo XXXX > /sys/devices/platform/msm_sdcc.2/mmc_host/mmc1/mmc1:$mmcresult/block/mmcblk0/queue/read_ahead_kb
cd /

NOTE: WHERE "XXXX" put you desired cache size in KB... E.G. 128 or 256 or 512 or 1024 or 2048

An App to exist that does the same work on every boot:HERE

And you can flash the ZIP files with CWM.. files below