netdev - Re: [BUG?] bonding, slave selection, carrier loss, etc.

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Message-ID: <4F39539B.5060507@genband.com>
Date:	Mon, 13 Feb 2012 12:16:59 -0600
From:	Chris Friesen <chris.friesen@...band.com>
To:	Ben Hutchings <bhutchings@...arflare.com>
CC:	Jay Vosburgh <fubar@...ibm.com>, andy@...yhouse.net,
	netdev <netdev@...r.kernel.org>
Subject: Re: [BUG?] bonding, slave selection, carrier loss, etc.

On 02/11/2012 12:52 PM, Ben Hutchings wrote:
> On Fri, 2012-02-10 at 17:53 -0800, Jay Vosburgh wrote:
>> Chris Friesen<chris.friesen@...band.com>  wrote:

>>> The best solution would be for bonding to just register for notification
>>> of the link going down.  Presumably most drivers should be doing that
>>> properly by now, and for devices that get interrupt-driven notification
>>> of link status changes this would allow the bonding code to react much
>>> quicker.
>>
>> 	A quick look at some drivers shows that at least acenic still
>> doesn't do netif_carrier_off, so converting entirely to a notifier-based
>> failover mechanism would break drivers that work today.
> [...]
>
> It might be worth having some sort of feature flag (in priv_flags) that
> indicates whether the driver updates the link state.  Alternately,
> disable polling of a device once you see a notification.

This makes a lot of sense to me...it is suboptimal to still be polling 
when most people that care about bonding reliability are going to be 
using ethernet hardware with interrupt-based link change notification.

Chris

-- 
Chris Friesen
Software Developer
GENBAND
chris.friesen@...band.com
www.genband.com
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