em driver - strange behavior

Hi.
I've posted some test with the latest em driver in the previous thread "Proposed 6.2 em RELEASE patch"...
It's working fine.
Now i see some strange behavior. Machine is Dual Intel Xeon 5110, with SuperMicro X7-DBE mainboard. It has dual port integrated Intel PRO/1000 EB lan card, one Intel 82542 Gigabit Ethernet Controller, and one Intel PRO/1000 PT.
The problem is the Intel PRO/1000 PT card. All other cards are in use (in production mode), only this card is down and not used right now, but it's generating more interrupts than any other card.

em3: flags=8802<BROADCAST,SIMPLEX,MULTICAST> mtu 1500
options=b<RXCSUM,TXCSUM,VLAN_MTU>
ether 00:15:17:0e:10:90
media: Ethernet autoselect
status: no carrier


output from systat -vm (interrupts/irq/interface):
14235 16: em3
6214 18: em0
914 19: em1
13613 24: em2

currently it has around 200Mbit/s total bandwidth on the other cards

system is: FreeBSD 6.2-PRERELEASE #1: Tue Nov 14 17:24:17 EET 2006 amd64
EM_INTR_FAST is defined in em driver
no polling

Any clues?

__
Miroslav
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