netdev - Re: [PATCH net-next] igmp: hash a hash table to speedup ip_check_mc

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Date:	Wed, 12 Jun 2013 00:26:00 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	sbohrer@...advisors.com, netdev@...r.kernel.org
Subject: Re: [PATCH net-next] igmp: hash a hash table to speedup
 ip_check_mc_rcu()

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Fri, 07 Jun 2013 08:48:57 -0700

> From: Eric Dumazet <edumazet@...gle.com>
> 
> After IP route cache removal, multicast applications using
> a lot of multicast addresses hit a O(N) behavior in ip_check_mc_rcu()
> 
> Add a per in_device hash table to get faster lookup.
> 
> This hash table is created only if the number of items in mc_list is
> above 4.
> 
> Reported-by: Shawn Bohrer <sbohrer@...advisors.com>
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>

Applied, thanks Eric.
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