On Tue, Oct 6, 2015 at 1:31 PM, Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx> wrote: > On Tue, Oct 06, 2015 at 06:07:50AM +0530, Jayan John wrote: >> On Tue, Oct 6, 2015 at 3:38 AM, Fabio Estevam <festevam@xxxxxxxxx> wrote: >> > On Mon, Oct 5, 2015 at 10:57 AM, Jayan John <jayanjohn79@xxxxxxxxx> wrote: >> >> We are developing a custom USB device on a iMX6q platform with a Chipidea >> >> HDRC. The device uses a single NCM interface for communication with another >> >> OTG device i.e. Chipidea HDRC again. I see very poor iperf UDP performance >> >> after role reversal with iperf server running on gadget. >> >> >> >> Kernel: 3.10.17 using Wandboard config >> > >> > Could you test this using kernel 4.2.3 or 4.3-rc4? >> Thanks. Moving to 4.2.3 or 4.3 would be a rather large exercise as a number of >> drivers would need changes and significant testing efforts as well. > > > Why is this? Your drivers should all be upstream by now, right? What > else needs to be changed to update to a new kernel version? > > Remember just how old and obsolete 3.10 is, you are on your own if you > use this, you will have to get support from the company that forces you > to use this kernel version, sorry. > > good luck! > > greg k-h Greg, I completely agree with you on moving to a newer kernel. Unfortunately, this is not an option I can pick at this time. I was hoping I might get pointers on the issue as there have been fixes related to performance on chipidea hdrc. I will keep this thread open for a day or two. thanks, jayan -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
