Maximum throughput ? limit?

[Adam PAPAI]

Dear List,

I feel my freebsd box is reaching his limits.

I'm doing load-balance with a pf (round-robin + NAT) in front of 3 web 
and 3 database servers. Everything works fine with 100-120MBit/s, but if 
it reaches over 150MBit/s to 200MBit/s or even 300MBit/s, the 
connections are stucked, nobody can connect to the server.

I checked it via "nload". And every time it goes over 150MBit/s it stars 
to drop some connections.

I have 40,000 connections at the same time.

Could it be because the pf? I mean it reaches some maximum throughput?

When i'm running the iperf from inside the NAT, it does only 
300-400MBit/s, but if I'm running it from the firewall itself, it does 
600-700 (it depends on the traffic). The servers are connected to each 
other via GBit.

Thanks in advance,


-- 
Adam PAPAI
E-mail: wooh at wooh.hu