Problems with netgraph

[Julian Elischer]

Oleksandr Samoylyk wrote:
> Dear developers,
> 
> Please read this thread:
> http://lists.freebsd.org/pipermail/freebsd-net/2008-May/017891.html
> 
> I'm using no encryption and no compression in mpd, so netgraph should fly.
> It seems to get bad after 500 sessions...
> 
> In FreeBSD 6 - it's swi1: net - 100% CPU
> In FreeBSD 7 - it's em0 taskq - 100% CPU

unfortunatly I've been totally  ignoring this thread because it said
"trouble with em" in the topic..
If you'd said
trouble with mpd  then maybe I'd have looked earlier..

> 
> After playing with it I can make guess that's a netgraph problem.
> 
> Maybe it's a poor design in netgraph the way it handle its tables and 
> it's is probably not designed to add so many interfaces.

how many?

> 
> Might be there something in the source code I can edit to improve the 
> table lookups or hash table or whatever netgraph use to store and 
> process the node information and do the ppp/gre work.

netgraph just had some work done on it for this exact reason,
but you may be jumping the gun a bit..

>