netdev - Re: Broadcom 5709 take long time to bring up

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Date:	Wed, 18 Aug 2010 23:19:32 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Rick Jones <rick.jones2@...com>
Cc:	Mitchell Erblich <erblichs@...thlink.net>,
	Benjamin Li <benli@...adcom.com>, Joe Jin <joe.jin@...cle.com>,
	Michael Chan <mchan@...adcom.com>,
	"terry.liu@...cle.com" <terry.liu@...cle.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: Broadcom 5709 take long time to bring up

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.

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