From: Eric Dumazet <edumazet@google.com>
Date: Thu, 7 Feb 2013 16:41:02 +0000 (+0000)
Subject: macvlan: add a salt to mc_hash()
X-Git-Tag: v3.9-rc1~139^2~125
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3807ff5899f892abb4f06747c245fd648a2acdc5;p=pandora-kernel.git

macvlan: add a salt to mc_hash()

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@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

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