linux-kernel - Re: [PATCH] sky2: flow control off

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Message-ID: <45C91ABF.9030504@pobox.com>
Date:	Tue, 06 Feb 2007 19:18:07 -0500
From:	Jeff Garzik <jgarzik@...ox.com>
To:	Stephen Hemminger <shemminger@...ux-foundation.org>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] sky2: flow control off

Stephen Hemminger wrote:
> Turn flow control off for sky2. When flow control is on, the transmitter
> may get randomly stuck. Perhaps there is hardware problem, but until
> Marvell provides errata information for workaround, it should default to off.
> 
> Signed-off-by: Stephen Hemminger <shemminger@...ux-foundation.org>
> ---
>  drivers/net/sky2.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/net/sky2.c b/drivers/net/sky2.c
> index 822dd0b..a31dea5 100644
> --- a/drivers/net/sky2.c
> +++ b/drivers/net/sky2.c
> @@ -3263,7 +3263,7 @@ #endif
>  
>  	/* Auto speed and flow control */
>  	sky2->autoneg = AUTONEG_ENABLE;
> -	sky2->flow_mode = FC_BOTH;
> +	sky2->flow_mode = FC_NONE;

I ACK the patch... conditional on some -mm style testing and user ACKs.

Logic:  if there were no downsides to disabling flow control globally, 
the world's networks would have already done so.  Flow control can be 
quite helpful, so I while I understand the errata argument, I also want 
to understand the full effect of this tiny patch.

	Jeff



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