sun quad hme performance

[Miguel]

Hi, i read in the archives a lot of references about poor performance 
with the sun quad ethernet (hme) on diferent servers (netras and 
sunfires), is this still an issue or has been addressed in 3.8 or 
3.9-current, i have two sunfire v120 that are losing packets between 
their ports, when i "activate" the pf rules the ping response time si 
very high, around 1253 ms,so our whatsup monitor report then down, the 
cpu load is very low (0.12) and the memory usage is 70mb, total memory 
of 512 mb , so this is not a resource problem,.
What can i check?
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thanks