kern/161899: [route] ntpd(8): Repeating RTM_MISS packets causing high CPU load for ntpd

[Gleb Smirnoff]

  Dmitrij,

On Wed, Feb 08, 2012 at 10:50:11AM +0000, Dmitrij Tejblum wrote:
D>  I would suggest to remove RTM_MISS messages at all. I believe that there 
D>  is no sofware that actually use it. OTOH, in some cases RTM_MISS 
D>  messages are really disturbing.
D>  
D>  E.g., a router without default route (e.g. runnung BGP) will always 
D>  generate some amount of RTM_MISS messages. They have no use, but require 
D>  daemons to parse them, and could result in overflow on routing socket 
D>  queue and, in turn, cause some important routing messages to be dropped.
D>  
D>  I have a patch that add a sysctl to turn off RTM_MISS messages, but 
D>  since no one use them, it would be easier to just remove them entirely.

Sounds reasonable. A patch that adds a sysctl is definitely a commit candidate.
But we can't be sure that no one uses these messages, so we can't remove them
entirely.

-- 
Totus tuus, Glebius.