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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
> --
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