From: Daniel J Blueman > Hi Freddy et al, I've copied this to linux-usb. > I'm experiencing poor network performance using an ASIX AX88179_178A > USB3 to ethernet adapter using any recent linux kernel (eg 3.11), > using an Intel XHCI USB3 controller. There a several problems with the xhci driver that show up when trying to use the ax88179_178a driver. Unfortunately some of the fixes have caused regressions on other host controllers with disk transfers. The patches may, or may not, be present in your kernel. The 'scatter-gather' support that is used in order to enable TSO is particularly good at exercising the buggy code paths. > Running iperf tests between one host with a gigabit PCIe NIC, via a > gigabit switch to the other host with various interfaces: > > PCIe bcm957762: send 818Mb/s, recv 910Mb/s > USB2 smsc75xx: send 341Mb/s, recv 330Mb/s > USB3 ax88179_178a: send 347Mb/s, recv 18.7Mb/s > > Are you able to reproduce the same 19Mb/s receive rate there? It might be that you are only actually running at USB2 speeds (check with lsusb -t). I have seem line rate Ge from my ax88179 card, but only with a patched kernel. David > > Many thanks, > Daniel > -- > Daniel J Blueman > -- > To unsubscribe from this list: send the line "unsubscribe netdev" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- 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
