netdev - Re: sky2 still badly broken

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Message-ID: <20120503082352.771acab3@nehalam.linuxnetplumber.net>
Date:	Thu, 3 May 2012 08:23:52 -0700
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Niccolò Belli <darkbasic@...uxsystems.it>
Cc:	netdev@...r.kernel.org
Subject: Re: sky2 still badly broken

On Thu, 03 May 2012 11:40:10 +0200
Niccolò Belli <darkbasic@...uxsystems.it> wrote:

> Il 02/05/2012 20:56, Stephen Hemminger ha scritto:
> > It could be that your switch doesn't do autonegotiation or flow
> > control. You are getting receive fifo overflow errors.
> 
> I don't have this problem with other NICs. Also transfer rate is very 
> low (even 2 MB/s sometimes) while I get ~110MB/s with other NICs (and 
> the same switch of course).
> 
> Niccolò

The receiver on some versions of the chip can't keep up with full speed
of 1G bit/sec. The receive  FIFO has hardware issues, and since I don't
work for Marvell, working around the problem is guesswork. Without exact
information all that can be done is have a timeout and blunt force reset
logic. The vendor driver sk98lin has the same brute force logic, but may
just not print the message.
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