From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932073AbaKSDKe (ORCPT ); Tue, 18 Nov 2014 22:10:34 -0500 Received: from comal.ext.ti.com ([198.47.26.152]:57672 "EHLO comal.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753851AbaKSDKd (ORCPT ); Tue, 18 Nov 2014 22:10:33 -0500 Date: Tue, 18 Nov 2014 21:10:49 -0600 From: Felipe Balbi To: Paul Zimmerman CC: "balbi@ti.com" , Jorge Ramirez-Ortiz , Greg KH , "linux-kernel@vger.kernel.org" , "linux-usb@vger.kernel.org" Subject: Re: [PATCH] usb: gadget: USB3 support to the legacy printer driver Message-ID: <20141119031049.GB24874@saruman> Reply-To: References: <546A829A.8030106@linaro.org> <20141118003028.GA11280@saruman> <546B5578.8040809@linaro.org> <20141118151753.GB8223@saruman> <546B874B.8060700@linaro.org> <20141118180039.GJ6179@saruman> <546BAF07.1050605@linaro.org> <20141118204708.GR6179@saruman> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="9zSXsLTf0vkW971A" Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --9zSXsLTf0vkW971A Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Tue, Nov 18, 2014 at 09:45:13PM +0000, Paul Zimmerman wrote: > > From: linux-usb-owner@vger.kernel.org [mailto:linux-usb-owner@vger.kern= el.org] On Behalf Of Felipe Balbi > > Sent: Tuesday, November 18, 2014 12:47 PM > >=20 > > On Tue, Nov 18, 2014 at 03:41:43PM -0500, Jorge Ramirez-Ortiz wrote: > > > > > > notice that the original PLX driver was still far from the theoretica= l 5Gbps > > > target (I was expecting to measure at least 3Gbps and could only get = 1Gbps). > > > So 1Gbps should be the target to meet on the kernel.org net2280 - do = you agree? > >=20 > > this depends on a whole bunch of things. Mainline is a lot different > > from PLX's kernel tree, I'm sure. > >=20 > > It also depends on how many PCIe lanes you're using. Just because USB3 > > guarantees 5Gbps bandwidth, if you use a 1x PCIe connector, you'll never > > get that ;-) >=20 > Being pedantic, USB3 runs at 4Gbps, not 5Gbps. The signal transitions > on the bus are at 5GT/s (5 giga-transitions per second), but due to the > 8b/10b encoding, that equates to 4Gbps data rate. I stand corrected :-) --=20 balbi --9zSXsLTf0vkW971A Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIcBAEBAgAGBQJUbAo5AAoJEIaOsuA1yqREzfcQAKR/sMk9WlhJK+1NWPk/LJ03 brwDyOQO/SGgYfZO/+EDpYqbgnWAhpFMCt5rcxmi1PFbsXLCIoEO55Xsjzd2m8aB hUm7N0NNAxwqh3BXVytA2hjcjYeKXbgijOj1Rfzz1RYIyTVsKrwFk7QGMZxYi8d5 pCboMUt3z7CQwAMqUEiGndYh3eYdPgY+OsmCv+3NZAEqAOuxy9DE6r7txR8hyY4r lJNeDJwIsVg8KxgIin7yBRWVDJltUMIpWlIqd4BILAOfj3TwLwRr/pjY0z+SJ+Kx 1/3t0l8Ol0PxPWlvAabsi2P/30WSmYSUGSriS8qpMO1rWtOSfjGcL+u4uzWsf3Co 3/6+YWdSMskvRiic/ct6WAppnO9zpHskSFs7OAkm9JgZ1VPy72VDI3zHZZ6oNygd B9GTBOAifKp5L2FoFVardzpnT9p9XawCtzxHy8/sNFXpQPrg1OdMGDZN0ipkKvIa qpGEEHRPYRW71vn1MYJcVRQbfqpswYdLBpaPS6GsFSC9UVXkdTMwW0UIed4s5Yba NDW9lUdiZP+HZdUqiZ++7nPC+I4gWwpnIMFRuH1tgimggx4OF3TUU3n25gJgF+xU 329kfvWxUd8+7RW3e9LGTDfjbag59rNwZ8TV8+CLGXw88OlybOA9tbxO6crQq5kg 1QRTEPUx8AyXSLHjQAJB =DpTt -----END PGP SIGNATURE----- --9zSXsLTf0vkW971A--