Route messages

[Bruce M. Simpson]

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.