netdev - Re: [PATCH] bonding: add some slack to arp monitoring time limits

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Date:	Fri, 31 Aug 2012 16:37:43 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	jbohac@...e.cz
Cc:	fubar@...ibm.com, chris.friesen@...band.com, andy@...yhouse.net,
	netdev@...r.kernel.org, ptesarik@...e.cz
Subject: Re: [PATCH] bonding: add some slack to arp monitoring time limits

From: Jiri Bohac <jbohac@...e.cz>
Date: Fri, 31 Aug 2012 00:02:47 +0200

> Currently, all the time limits in the bonding ARP monitor are in
> multiples of arp_interval -- the time interval at which the ARP
> monitor is periodically scheduled.
> 
> With a fast network round-trip and a little scheduling latency
> of the ARP monitor work, a limit of n*delta_in_ticks may
> effectively mean (n-1)*delta_in_ticks.
> 
> This is fatal in case of n==1  (the link will stay down
> forever) and makes the behaviour non-deterministic in all the
> other cases.
> 
> Add a delta_in_ticks/2 time slack to all the time limits.
> 
> Signed-off-by: Jiri Bohac <jbohac@...e.cz>

Applied to net-next, thanks.
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