08:08 <tasslehoff> So, the usb benchmark thing I asked about the other day. We're thinking of creating a product where the physical connections will be usb and usb-otg. Then we may have to connect to all sorts of things, like usb-ethernet adapters, mhl, mass storage devices and android phones. I've been tasked with figuring out the actual bandwith we can expect from usb on the imx6.

08:09 <tasslehoff> anyone got a) benchmarks or info on the actual speed I can expect. b) suggestions for tests I should run to get a fairly certain image of the performance on the usb ports?

11:49 <rz2k_> tasslehoff: performance is not your first priority, first priority would be getting info about how hard memory leaks/kernel crashes with your usb devices

11:50 <rz2k_> example: company where I was working before on imx6 product now has problems in production env: NAND degrades significantly over time

11:50 <rz2k_> like 2 weeks of worktime and fs dies, chip itself is ok (tested many times with all available tools)

12:37 <tasslehoff> rz2k_: I didn't quite understand that first sentence.

12:39 <rz2k_> when planning usage of imx6 in such project as yours, you need to build up a test rig and test for crashes first, because you might end finding that one of usb devices you want to connect crashes the kernel

12:39 <rz2k_> then think about how well it will perform

12:40 <tasslehoff> rz2k_: I see, and kinda agree. But if the performance is less than we need I can spare the testing of the devices, cause than we will need to find another solution.

12:40 <rz2k_> for example, I had problems with one of the USB soundcards connected to imx6 for some time, turned out to be a bug in the kernel

12:40 <rz2k_> spent many hours bisecting mainline until found a fix :)

12:41 <tasslehoff> rz2k_: :)

12:41 <tasslehoff> rz2k_: I don't really know which usb devices will be connected yet.

12:42 <rz2k_> from my experience - imx6 as usb-hid device connected to a windows pc was slow, copying 350mb of data took 40 minutes.

12:43 <rz2k_> (dont ask why someone needed to use usb-hid for such transfer :)

12:43 <rz2k_> try to ask at meta-freescale, if I remember correctly, there was a package called imx-test, that had unit tests for every IP in imx6, so it might have something for usb

12:44 <rz2k_> meta-freescale mailing list

12:46 <tasslehoff> rz2k_: ah. good tip. thanks.

13:16 <aholler> just use the fs-gadget and transfer a file to easily get an idea of speed

13:19 <aholler> it's enough to play hd-movies ;)

13:20 <tasslehoff> :)