Part Number: AM3352
Hi :
We use SDK 05.03.00.07 to test USB speed. Use the following instructions:
hdparm -t /dev/sda1
The test results are as follows：
When we fixed the CPU frequency to 800M，the speed is stable at 12MB/sec ：
# hdparm -t /dev/sda1
/dev/sda1:
Timing buffered disk reads: 38 MB in 3.02 seconds = 12.59 MB/sec
# hdparm -t /dev/sda1
/dev/sda1:
Timing buffered disk reads: 38 MB in 3.02 seconds = 12.59 MB/sec
# hdparm -t /dev/sda1
/dev/sda1:
Timing buffered disk reads: 38 MB in 3.06 seconds = 12.42 MB/sec
But when we use SDK 03.01.00.06 and CPU frequency is not fixed, the speed is stable at 16MB/sec.
# hdparm -t /dev/sda1
/dev/sda1:
Timing buffered disk reads: 50 MB in 3.00 seconds = 16.65 MB/sec
# hdparm -t /dev/sda1
/dev/sda1:
Timing buffered disk reads: 50 MB in 3.09 seconds = 16.19 MB/sec
# hdparm -t /dev/sda1
/dev/sda1:
Timing buffered disk reads: 50 MB in 3.01 seconds = 16.61 MB/sec
# hdparm -t /dev/sda1
/dev/sda1:
Timing buffered disk reads: 50 MB in 3.09 seconds = 16.20 MB/sec
