netdev - Re: [PATCH v2 net-next 0/9] ipv6: fib6: socket dst

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Message-Id: <20140926.002853.1097612772155886372.davem@davemloft.net>
Date:	Fri, 26 Sep 2014 00:28:53 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	hannes@...essinduktion.org
Cc:	netdev@...r.kernel.org, eric.dumazet@...il.com,
	hideaki@...hifuji.org, vyasevich@...il.com,
	nicolas.dichtel@...nd.com, kafai@...com
Subject: Re: [PATCH v2 net-next 0/9] ipv6: fib6: socket dst_entry
 improvments and cleanups

From: Hannes Frederic Sowa <hannes@...essinduktion.org>
Date: Sun, 21 Sep 2014 16:11:44 +0200

> Eric Dumazet noticed that rt6_nodes wich are neither RTF_NONEXTHOP nor
> RTF_GATEWAY but DST_HOST ones cause major routing lookup churn because
> their rt6_genid is never renewed, thus ip6_dst_check always considers
> them outdated. This is a major problem, because these kind of routes
> are normally used to in input handling.

This series is a disappointment for me from the perspective of the
fact that we have a regression in mainline and this is too complex
of a set of changes for there.

If we relookup the thing every TCP input packet, we might as well
not do the input route caching in the socket.
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