manual/generic/sdcard-speed-test
Description
Measure sdcard read/write speed with dd command.
Maintainer
- chase.qi@linaro.org
OS
- android
- debian
Scope
- benchmark
Devices
- panda
- panda-es
- arndale
- hi6220-hikey
- db410c
Steps to reproduce
- Enter the root directory of the sdcard under test.
- On android, run the following command to test write speed.
- # dd if=/dev/zero of=dd.img bs=1048576 count=2000
- On debian, flag conv=fsync is needed, which tells dd to write to disk.
- # dd if=/dev/zero of=dd.img bs=1048576 count=2000 conv=fsync
- Before read speed test, clear the memory cache to ensure that the file is actually read from drive.
- # sync; echo 3 > /proc/sys/vm/drop_caches
- Run dd read speed test.
- # dd if=dd.img of=/dev/null bs=1048576
- Remove dd.img.
- # rm dd.img