From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH net-next] net: linkwatch: allow vlans to get carrier
 changes faster
Date: Thu, 15 Sep 2011 15:44:10 -0400 (EDT)
Message-ID: <20110915.154410.26623232105923613.davem@davemloft.net>
References: <4E5A40A9.2000404@hitachi.com>
	<1314540589.3036.12.camel@edumazet-laptop>
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Cc: mitsuo.hayasaka.hu@hitachi.com, herbert@gondor.hengli.com.au,
	shemminger@vyatta.com, kaber@trash.net, mirq-linux@rere.qmqm.pl,
	therbert@google.com, jesse@nicira.com, netdev@vger.kernel.org,
	linux-kernel@vger.kernel.org, yrl.pp-manager.tt@hitachi.com
To: eric.dumazet@gmail.com
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From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Wed, 31 Aug 2011 11:31:58 +0200

> There is a time-lag of IFF_RUNNING flag consistency between vlan and
> real devices when the real devices are in problem such as link or cable
> broken.
> 
> This leads to a degradation of Availability such as a delay of failover
> in HA systems using vlan since the detection of the problem at real
> device is delayed.
> 
> We can avoid the linkwatch delay (~1 sec) for devices linked to another
> ones, since delay is already done for the realdev.
> 
> Based on a previous patch from Mitsuo Hayasaka
> 
> Reported-by: Mitsuo Hayasaka <mitsuo.hayasaka.hu@hitachi.com>
> Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>

Applied.