Some performance measurements on the FreeBSD network stack

[K. Macy]

>> This is indeed a big problem.  I'm working (rough edges remain) on
>> changing the routing table locking to an rmlock (read-mostly) which
>

This only helps if your flows aren't hitting the same rtentry.
Otherwise you still convoy on the lock for the rtentry itself to
increment and decrement the rtentry's reference count.

> i was wondering, is there a way (and/or any advantage) to use the
> fastforward code to look up the route for locally sourced packets ?
>

If the number of peers is bounded then you can use the flowtable. Max
PPS is much higher bypassing routing lookup. However, it doesn't scale
to arbitrary flow numbers.


-Kip