poor fastforwarding and polling performance

[Ask Bjørn Hansen]

Hi,

I'm playing with the settings for some PC Engines WRAP cards[1] (sis  
interfaces) that acts as mini routers on relatively slow networks.

I am testing with iperf from two Linux boxes (that are plugged  
directly into an interface each on the FreeBSD box).

The IP addresses used for the routing are managed by CARP, does that  
make a difference?

Without polling or fastforwarding I get ~25-40Mbit throughput  
(~25Mbit with pf, ~40Mbit with pf disabled).  (During this the box is  
completely unresponsive on the console).

With fastforwarding I get ~7-15Mbit (!)

With polling (ifconfig sis0 polling; ifconfig sis1 polling) I get  
about 1.5-2Mbit (pf doesn't make a difference).

If I enable both fastforwarding and polling I seem to get slightly  
better results, but still Not Good.  The only upside is that with  
polling enabled the box stays responsive, but it not much help.  :-)

Any ideas?


  - ask

[1] http://www.pcengines.ch/wrap.htm

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