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Linux File System Read Write Performance Test for NAND flash

hi i would like to know the read & write performance for NAND flash under linux.

i have linux 4.1.13 flashed with filesystem in NAND in AM335xevm.

i follwed one of the command given by another member as follows:

dd if=/dev/mtd7ro of=/dev/null bs=1M count=100

but i can only see in reply as

100+0 records in
100+0 records out
its not showing hw many bytes copied at what speed like the way it is told in this post : https://e2e.ti.com/support/embedded/linux/f/354/t/128433