netdev - RE: AX88179_178A USB3 ethernet adapter performance issue

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Message-ID: <063D6719AE5E284EB5DD2968C1650D6D0F6B9B5B@AcuExch.aculab.com>
Date:	Thu, 6 Feb 2014 17:17:08 +0000
From:	David Laight <David.Laight@...LAB.COM>
To:	'Sarah Sharp' <sarah.a.sharp@...ux.intel.com>
CC:	'Daniel J Blueman' <daniel@...ra.org>,
	Freddy Xin <freddy@...x.com.tw>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Netdev <netdev@...r.kernel.org>
Subject: RE: AX88179_178A USB3 ethernet adapter performance issue

From: Sarah Sharp
> > I have seem line rate Ge from my ax88179 card, but only with a
> > patched kernel.
> 
> David, did you mean you have the same line rate as Daniel?

No I meant I've seen it saturate a Ge link (with sufficiently large frames).

With very small frames the tx rate gets limited to a nice round number.
Possibly because the usb message rate limit.
It is high enough that it really doesn't matter, the code could put multiple
frames in a single URB, but I'm not sure the NAPI processing loop makes that
easy.

The receive side will run at a higher packet rate.

	David

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