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Date:	Thu, 6 Feb 2014 22:33:26 +0800
From:	Daniel J Blueman <>
To:	Freddy Xin <>
Cc:	Netdev <>
Subject: AX88179_178A USB3 ethernet adapter performance issue

Hi Freddy et al,

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.

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?

Many thanks,
Daniel J Blueman
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