How to measure read/write performance of UFS

Hi TI,

I am currently investigating on the read/write speed of the Flash (THGAF8G8T23BAILB), which is mounted on the EVM. I made a ext4 partition, which is listed as /dev/sdb1 in the available devices:

root@j7-evm:~# df -hT
Filesystem           Type            Size      Used Available Use% Mounted on
/dev/root            ext4           14.5G      1.8G     11.9G  13% /
devtmpfs             devtmpfs        1.6G     64.0K      1.6G   0% /dev
tmpfs                tmpfs           1.8G         0      1.8G   0% /dev/shm
tmpfs                tmpfs           1.8G     27.7M      1.8G   1% /run
tmpfs                tmpfs           1.8G         0      1.8G   0% /sys/fs/cgroup
tmpfs                tmpfs           1.8G         0      1.8G   0% /tmp
tmpfs                tmpfs          16.0M         0     16.0M   0% /media/ram
tmpfs                tmpfs          50.0M    256.0K     49.8M   1% /var/volatile
tmpfs                tmpfs         378.9M         0    378.9M   0% /run/user/0
/dev/mmcblk1p1       vfat           61.0M      2.4M     58.7M   4% /run/media/mmcblk1p1
/dev/sdb1            ext4           29.0G      1.0G     26.4G   4% /mnt/flash

However, when executing the common commands for measuring read/write speed, I encounter some issues:

1. using hdparm

root@j7-evm:~# hdparm -tT /dev/sdb1

/dev/sdb1:
 Timing cached reads:   5784 MB in  2.00 seconds = 2894.49 MB/sec
SG_IO: bad/missing sense data, sb[]:  70 00 05 00 00 00 00 0a 00 00 00 00 20 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 Timing buffered disk reads: 2750 MB in  3.00 seconds = 916.49 MB/sec

Q1: Why is there a problem with missing sense data?

2. using dd

root@j7-evm:~# dd if=/dev/zero of=tempfile bs=1M count=1024; sync
1024+0 records in
1024+0 records out
root@j7-evm:~# 

Q2: Here, I do not get the expected output, which tells me the measured write speed. Why? Apart from this, the command worked as expected. It wrote a file "tempfile" to the flash.

Thanks for your help!