About this app

This is the PRO version of Adjust SD Speed. It features AD-free and more buffer size for setting and benchmark.

Please evaluate its full functionality in FREE version Adjust SD Speed here, https://play.google.com/store/apps/details?id=com.RombieSoft.adj_sd_speed. You can try the FREE version before you purchase. If you don't like and want to return and refund after 15 minutes of Google policy, please email to me. Thanks!

Adjust and Boost Your SD Buffered Read/Write Throughput Performance.

**REQUIREMENT** Rooted Phone and Root Privilege are Required Because This App Need to Change the Kernel Parameter of Your System.

Optimal setting:
1. read_ahead_kb: depends on your applications and memory size (512KB ~ 4096KB)
2. scheduler: deadline
3. fifo_batch: 1
4: nr_requests: depends on your memory size. may > 128

This app can adjust the SD card parameter "read_ahead_kb" in your Android Linux kernel setting. By setting the attribute, your mobile device and SD card read/write might gain better performance. The buffered read performance is highly correlated with running Apps on SD, browsing photo albums, etc. The write performance is not directly controlled by this attribute. By enlarging read buffer with reducing read action to SD, write command can be done more quickly and efficiently without being interrupted by multiple separate SD read command. On the mobile device equipped with less memory space, it's recommended not to set the buffer size larger than 1024KB. The larger buffer size is good but it might affect the available memory space used by other buffers and normal Apps. It could result in bad performance due to Android needs to kill inactive Apps and recovery memory frequently.

Also, you can set the App option to automatically enlarge the default system buffer on EVERY boot.

This app also has built-in performance testing feature. This does not actually reflect the real RAW SD read/write speed, but highly relative to your normal phone and Android usage because Linux OS has system buffer for file IO.

**NOTE** Android is multi-tasking OS and Java-like VM. Due to lack of REAL-TIME operation (and impossible to lock your phone to do real time jobs), the performance testing results might be affected by many factors, such as background tasks, App managers, Dalvik VM garbage collections, Android System and Google Services, and etc. If the testing result looks not accurate, please quit/kill some applications running in the background or accessing to SD, and perform multiple run to see the best one.

New features

1.2 Adding support of ICS 4.0.4. Adding more settings (scheduler, fifo_batch, nr_requests)
1.1 Paid version released

App Permissions

Allows an application to write to external storage.
Allows an application to receive the ACTION_BOOT_COMPLETED that is broadcast after the system finishes booting.
Allows using PowerManager WakeLocks to keep processor from sleeping or screen from dimming.
Allows an application to read from external storage.