netdev - Re: [PATCH net-next] net: only run neigh_forced

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Message-Id: <20120919.235102.1659819445753338481.davem@davemloft.net>
Date:	Wed, 19 Sep 2012 23:51:02 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	lorenzo@...gle.com
Cc:	eric.dumazet@...il.com, netdev@...r.kernel.org, maze@...gle.com,
	therbert@...gle.com
Subject: Re: [PATCH net-next] net: only run neigh_forced_gc() from one cpu

From: Lorenzo Colitti <lorenzo@...gle.com>
Date: Thu, 20 Sep 2012 12:48:09 +0900

> Sorry to butt in, but just to clarify - are you just saying that the
> description should mention IPv6 explicitly, or is there something else
> wrong with the patch?
> 
> If this patch makes IPv6 performance better without affecting IPv4, it's a
> good idea to apply it anyway, right? IPv6 dst entry garbage collection can
> potentially cause serious performance issues on any server with a public
> IPv6 address, and this patch substantially improves the situation.

He's targetting net-next, and I've told him both in previous public
discussions and in recent private communication that the correct fix
is to make ipv6 routes use ref-count-less neighbour handling schemes
like ipv4.

This patch will not be applied as-is, it's not the correct way to fix
this problem.
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