From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ben Hutchings Subject: Re: Broadcom 5709 take long time to bring up Date: Wed, 18 Aug 2010 23:19:32 +0100 Message-ID: <1282169972.3454.148.camel@localhost> References: <20100818143432.GA29386@joejin-pc.cn.oracle.com> <1282147735.3880.83.camel@localhost> <70AE41F9-6FB7-43E3-A0C0-450E964A9B56@earthlink.net> <4C6C4FE5.20509@hp.com> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit Cc: Mitchell Erblich , Benjamin Li , Joe Jin , Michael Chan , "terry.liu@oracle.com" , "netdev@vger.kernel.org" To: Rick Jones Return-path: Received: from exchange.solarflare.com ([216.237.3.220]:2878 "EHLO exchange.solarflare.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751042Ab0HRWTj (ORCPT ); Wed, 18 Aug 2010 18:19:39 -0400 In-Reply-To: <4C6C4FE5.20509@hp.com> Sender: netdev-owner@vger.kernel.org List-ID: On Wed, 2010-08-18 at 14:25 -0700, Rick Jones wrote: > Mitchell Erblich wrote: > > On Aug 18, 2010, at 9:08 AM, Benjamin Li wrote: > > > > > >>Hi Joe, > >> > >>Just a couple of quick questions: > >> > >>1. It is possible that autonegotiation could take in the orders of > >>seconds depending on the remote partner. > > > > > > No. It happens in ms. > > > > Mitchell Erblich > > Both may be correct, depending on the context. The IEEE specs likely mandate > that autonegotiation take no longer than N ms, but there may indeed be kit out > there that takes rather longer... Autonegotiation per se should not take very long, but 1000BASE-T or 10GBASE-T also require the PHYs to sync clocks, detect and cancel echoes, and so on. I believe that that link training normally takes a few seconds after AN is done. Ben. -- Ben Hutchings, Senior Software Engineer, Solarflare Communications Not speaking for my employer; that's the marketing department's job. They asked us to note that Solarflare product names are trademarked.