On Thu, Jan 30, 2014 at 09:32:49PM -0500, Mark Lord wrote: > On 14-01-30 06:26 PM, Sarah Sharp wrote: > > On Thu, Jan 30, 2014 at 05:20:40PM -0500, Mark Lord wrote: > >> On 14-01-30 04:41 PM, Sarah Sharp wrote: > >>> > >>> Mark and David, can you pull the 3.13-td-changes-reverted branch again, > >>> and see if the latest patch fixes your issue? It disables scatter > >>> gather for the ax88179_178a device, but only when it's operating at USB > >>> 3.0 speeds. > >> > >> As expected, this works just fine. > > > > Did it work when plugged into a USB 2.0 hub? > > Curiosity, NO. Dies almost immediately when run at USB 2.0 Hi-Speed. > With a USB 2.0 hub, with a USB 2.0 port on a USB 3.0 hub, > and with a USB 2.0 extension cable in place of a hub. > > Near instant hangs. > > Plugged directly to the USB 3.0 port, it works fine. Ok, that makes sense. The patch I wrote only limited scatter-gather at USB 3.0 speeds, to see if scatter-gather could work at USB 2.0 speeds. Reverting commit 3804fad45411b48233b48003e33a78f290d227c8 "USBNET: ax88179_178a: enable tso if usb host supports sg dma" is the right way to go instead. Sarah Sharp -- 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
