netdev - Re: [PATCH net-next] net: linkwatch: allow vlans to get carrier changes faster

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Message-Id: <20110915.154410.26623232105923613.davem@davemloft.net>
Date:	Thu, 15 Sep 2011 15:44:10 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	mitsuo.hayasaka.hu@...achi.com, herbert@...dor.hengli.com.au,
	shemminger@...tta.com, kaber@...sh.net, mirq-linux@...e.qmqm.pl,
	therbert@...gle.com, jesse@...ira.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, yrl.pp-manager.tt@...achi.com
Subject: Re: [PATCH net-next] net: linkwatch: allow vlans to get carrier
 changes faster

From: Eric Dumazet <eric.dumazet@...il.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@...achi.com>
> Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>

Applied.
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