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Message-ID: <063D6719AE5E284EB5DD2968C1650D6D0F6B9A21@AcuExch.aculab.com> Date: Thu, 6 Feb 2014 15:39:02 +0000 From: David Laight <David.Laight@...LAB.COM> To: 'Daniel J Blueman' <daniel@...ra.org>, Freddy Xin <freddy@...x.com.tw>, "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>, 'Sarah Sharp' <sarah.a.sharp@...ux.intel.com>, Greg Kroah-Hartman <gregkh@...uxfoundation.org> CC: Netdev <netdev@...r.kernel.org> Subject: RE: AX88179_178A USB3 ethernet adapter performance issue 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@...r.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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