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Date: Sun, 15 Jun 2008 11:16:17 +0100
From: "Bruce M. Simpson" <bms@FreeBSD.org>
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To: Paul <paul@gtcomm.net>
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Cc: FreeBSD Net <freebsd-net@freebsd.org>
Subject: Re: Route messages
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Paul wrote:
> Get these with GRE tunnel on
> FreeBSD 7.0-STABLE FreeBSD 7.0-STABLE #5: Sun May 11 19:00:57 EDT 
> 2008     :/usr/obj/usr/src/sys/ROUTER  amd64
> But do not get them with 7.0-RELEASE
>
> Any ideas what changed? :)  Wish there was some sort of changelog..
> # of messages per second seems consistent with packets per second on 
> GRE interface..
> No impact in routing, but definitely impact in cpu usage for all 
> processes monitoring the route messages.

RTM_MISS is actually fairly common when you don't have a default route.

Messages which get enqueued don't necessarily get delivered -- and very 
few processes actually listen to the routing socket actively like this, 
so I wouldn't worry about it.

If it's a real concern for you then you could try hacking in a sysctl to 
tell the radix trie code not to issue RTM_MISS messages on the routing 
socket.