packet drop with intel gigabit / marwell gigabit

[OxY]

hi!

i had the packet drop problem with the marwell yukon gigabitcard:
(system is an amd 2000+xp, 512mb ram, fbsd 6.0-p5)

when the apache ran, with no http, just used to share files and the traffic was
2-2,5MB/S i had 14-17% packet drop on the gigabit interface..
with the sysctl i succesfully pulled it down to 12-14%, but it was terrible, 
so i bought an intel pro/1000 gt.
with this i have 3-6% drop with same traffic load on the other interface..
when i stop the apache packet drop falls down to 0-0.1%, which is great.
but with apache it's terrible..

first i changed some sysctl settings, benchmarked all change with
iperf (udp test).i changed these:

kern.maxfiles=65536
kern.ipc.maxsockbuf=50000000
kern.ipc.nmbclusters=5000000
kern.ipc.somaxconn=4096
net.inet.tcp.inflight.enable=1
net.inet.tcp.inflight.max=10737254400
net.inet.tcp.recvspace=65536
kern.ipc.shmmax=409600000
net.inet.tcp.delayed_ack=0
kern.polling.burst_max=1000
kern.polling.each_burst=120
kern.polling.idle_poll=1
kern.polling.user_frac=5
kern.polling.reg_frac=50
kern.polling.enable=1
net.inet.udp.maxdgram=57344

i have three variables in load.conf:

kern.ipc.maxsockets="81920"
kern.maxusers="512"
kern.ipc.nsfbufs="65536"

then i tried 4BSD and ULE scheduler, ULE was better, but i accept any suggestion and tip :)

and after all i realized that it's not a bit better, than before...
please give me some hints, advices, tips, sysctl settings, kernel config parameters, anything to get rid of the packet loss..
here's my kernel config: http://field.hu/kernconf.txt
thanks!