netdev - Re: [PATCH] ip6tnl: avoid touching dst refcount in ip6_tnl

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Message-Id: <20110801.015606.1882260753384583237.davem@davemloft.net>
Date:	Mon, 01 Aug 2011 01:56:06 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH] ip6tnl: avoid touching dst refcount in ip6_tnl_xmit2()

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Thu, 28 Jul 2011 16:32:25 +0200

> Even using percpu stats, we still hit tunnel dst_entry refcount in
> ip6_tnl_xmit2()
> 
> Since we are in RCU locked section, we can use skb_dst_set_noref() and
> avoid these atomic operations, leaving dst shared on cpus.
> 
> Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>

Queued up for net-next
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