Super slow USB


#1

Hi,
I’ve been playing with 410C just for couple hours, but I noticed that USB is super slow. Tested with fast USB 3.0 pendrive:

linaro@linaro-alip:~$ sudo hdparm -t /dev/sda1
Timing buffered disk reads: 8 MB in 3.39 seconds = 2.36 MB/sec
Timing buffered disk reads: 8 MB in 3.38 seconds = 2.37 MB/sec
Timing buffered disk reads: 8 MB in 3.51 seconds = 2.28 MB/sec

on other boards (odroid) I’ve been playing with I get at least 10x this value, on PC I get 110MB/sec.
Same issue with USB LAN adapter - network is super slow.
I also can’t get my webcam to work with any reasonable resolution.

Anyone else have similar issues ? Any ideas how to solve that ?

I’m using linux-headers-4.2.0-linaro-lt-qcom with Ubuntu 15.04.
I have 12V 2.0A power supply so power shouldn’t be a problem.

EDIT: I also tried changing USB HOST jumper, but no change in speed.


#2

hi,

yes, we are aware about this, and we are looking into it. at this point we’ve checked all clocks/bus configurations, and they are ok. We are suspecting a bug in the USB driver… and are still looking into it.

Note that this board support USB 2.0, not 3.0.

cheers


#3

Even with 2.0 I should get at least 20MB/s without any problem, right ?

I’m waiting for updates!
Thanks!


#4

yes, of course… as I said, there is an issue. I brought up USB 2.0 vs 3.0 since you mentioned USB 3.0 pen drive, I just wanted to avoid any confusion.


#5

Hi,

I’m seeing the same issue and was wondering if there are any work-arounds. Do Android and Windows 10 support higher-speed
USB?

Thanks,
Hendrik


#6

hi,

i believe the USB performance issue should be resolved now. Can you guys please try this build and report back here?

http://builds.96boards.org/snapshots/dragonboard410c/linaro/ubuntu/107/

You can rebuild the tip of the kernel branch , if you prefer (and know how to do that), all relevant changes have been pushed to this branch:

https://git.linaro.org/landing-teams/working/qualcomm/kernel.git/shortlog/refs/heads/release/qcomlt-4.2

thanks


#7

Now it works at 18MB/s
Much better. Thanks!