Hello All,
We've been using OMAP3530 processor for one of our product and recently migrated to 2.6.32 kernel. While doing some performance tests we found that the USB performance is degraded to a great extent. Shown below are the test results with the old kernel (2.6.22) and the new one ON THE SAME PLATFORM.
I initially thought that the USB module clock was set wrong. After verifying all the registers (bit by bit) with those that was used in 2.6.22, it seems there is nothing to do with register settings, as everything is same as in 2.6.22.
While searching this forum, I found couple of similar issues but nothing gave us a solution.
Did any of you come across such issue?
I would really appreciate for any suggestions. Thanks.
Kalai
EHCI throughput
--------------------------
on 2.6.32 kernel
[ ID] Interval Transfer Bandwidth
[ 3] 0.0-10.0 sec 62.3 MBytes 52.2 Mbits/sec
on 2.6.22 kernel
[ ID] Interval Transfer Bandwidth
[ 3] 0.0-10.0 sec 112 MBytes 93.7 Mbits/sec
OTG Throughput
-------------------------
on 2.6.32
[ ID] Interval Transfer Bandwidth
[ 3] 0.0-10.0 sec 48.7 MBytes 40.9 Mbits/sec
on 2.6.22
[ ID] Interval Transfer Bandwidth
[ 3] 0.0-10.0 sec 110 MBytes 92.2 Mbits/sec
