Read timings on file systems
Figured I would post this for information sharing purpose.
I have been doing some device read timings on internal memory / sdcard file systems.
- internal flash -> standard
- SD card with 1 VFAT partition
- SD card with 1 ext4 partition
Below measured read timings (measured with "hdparm -t"):
1) internal flash
bash-3.2# /data/hdparm -t /dev/block/mmcblk0p25
Timing buffered disk reads: 90 MB in 3.01 seconds = 29.87 MB/sec
2) VFAT on sdcard partition
bash-3.2# /data/hdparm -t /dev/block/mmcblk1p1
Timing buffered disk reads: 22 MB in 3.07 seconds = 7.17 MB/sec
3) ext4 on sdcard partition
bash-3.2# /data/hdparm -t /dev/block/mmcblk1p2
Timing buffered disk reads: 28 MB in 3.03 seconds = 9.24 MB/sec
Clear where you have to store your data if you want high read throughput (and not surprising of course).
Note: "hdparm" compiled for arm from original source code.
Readahead = 8192 in all cases.
HTC Desire, rooted, S-OFF, with Ubuntu fonts.
HTC Flyer WIFI, rooted, S-OFF, HC, Ubuntu fonts.