[FreeBSD-6.1Release]About the removal of route cache in PCB

[Blue]

Hi, all:

I am wondering why the FreeBSD-6.1 version removes the route cache in 
PCB (struct inpcbin in_pcb.h)? Does the removal do anything good? Or its 
existence would have potential problems? 'Cause in my opinion, the 
removal would only produce extra time when emitting a packet since the 
routing table lookup is unavoidable. So there's must be a good reason 
for the change.

Best regards,

blue