netdev - RE: AX88179_178A USB3 ethernet adapter performance issue

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

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

--
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