netdev - Re: [PATCH net-next] ipv4: tcp: dont cache unconfirmed intput dst

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Message-Id: <20120627.170101.99084491660488389.davem@davemloft.net>
Date:	Wed, 27 Jun 2012 17:01:01 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	netdev@...r.kernel.org, hans.schillstrom@...csson.com
Subject: Re: [PATCH net-next] ipv4: tcp: dont cache unconfirmed intput dst

From: David Miller <davem@...emloft.net>
Date: Wed, 27 Jun 2012 16:44:18 -0700 (PDT)

> What happens now is that legitimate traffic is harmed too.  If we
> really go to established state, we'll cache the DST_NOCACHE route
> in sk->sk_rx_dst.

This change also means that all routed TCP traffic will use
DST_NOCACHE routes as well.

It's not a requirement to turn off early demux on a router, and I very
much wanted to avoid the knob altogether.  So this side effect is not
acceptable.

There are quite a number of unwanted side effects from this change, so
I think we'll have to revert unless you can fix up all of the relevant
cases quickly.
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