netdev - Re: [PATCH net-next] macvlan: add a salt to mc

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Message-Id: <20130208.175736.1569565810949513617.davem@davemloft.net>
Date:	Fri, 08 Feb 2013 17:57:36 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	netdev@...r.kernel.org, maze@...gle.com
Subject: Re: [PATCH net-next] macvlan: add a salt to mc_hash()

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Thu, 07 Feb 2013 18:41:02 -0800

> From: Eric Dumazet <edumazet@...gle.com>
> 
> Some multicast addresses are common to all macvlans,
> so if a multicast message has a hash value collision, we
> have to deliver a copy to all macvlans, adding significant
> latency and possible packet drops if netdev_max_backlog
> limit is hit.
> 
> Having a per macvlan hash function permits to reduce the
> impact of hash collisions.
> 
> Suggested-by: Maciej Żenczykowski <maze@...gle.com>
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>

Applied.
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