macvlan: add a salt to mc_hash()

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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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Eric Dumazet 2013-02-07 16:41:02 +00:00 • committed by David S. Miller

parent d527043040

commit 3807ff5899

1 changed files with 13 additions and 4 deletions

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17

drivers/net/macvlan.c

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