On Tue, Oct 06, 2015 at 10:54:46PM +0530, Jayan John wrote: > 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. Then you need to push this issue back to the people that are forcing you to not have this option, as this is their responsibility, not the community's. Best of luck, greg k-h -- 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
