netdev - Re: sky2 still badly broken

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Message-ID: <20120503142517.310ea84c@nehalam.linuxnetplumber.net>
Date:	Thu, 3 May 2012 14:25:17 -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 21:36:50 +0200
Niccolò Belli <darkbasic@...uxsystems.it> wrote:

> Il 03/05/2012 17:23, Stephen Hemminger ha scritto:
> > 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.
> 
> Just one question: if that is true why don't I have any problem with a 
> point to point gigabit link? I did transfer 3GB from ram to ram (ramfs) 
> at 100+MB/s without any issue in a point to point setup, as soon as I 
> attach it to the switch I have problems (very low transfer rate and tons 
> of rx errors).

I don't know but the PHY interaction is different with auto-crossover.
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