OpenBSD intel em driver problem

 Hi,
I have big trouble with Intel em NIC both OpenBSD latest stable (4.3)
and snapshot ( 2 July 4.4 version) version.
My investigations showed that this problem is related to em driver.
This problem appear when i tried to use dual port Intel Gigabit NIC with
OpenBSD(4.3 and Snapshot) . However this Dual port NIC is working well
with Linux Operating system at same machine. So there are no any HW
related problem.
I am attached dmesg, ifconfig, netstat, arp and vmstat outputs in
compressed bug.tgz file.
Both 4.3 and Snapshot versions give following errors:
em0: watchdog timeout -- reseting
em0: watchdog timeout -- reseting
em0: watchdog timeout -- reseting
em0: watchdog timeout -- reseting
or
em1: watchdog timeout -- reseting
............

When i sniffed packets interface send arp requests and sending packets
arrived to target host. But reply packets or new packets never got by em
interfaces.
My PC have AMD Athlon 64 X2 4000+ , 2GB Dual Channel Ram, Samsung SATA
300GB disk, Motherboard Gigabyte Nvida MCP61 chipset onboard Video and Lan.
Additionally have Intel Pro 1000/PT Dual port Adapter & Realtek chipstet
100Mb NIC

Regards.
Devrim Seral

[demime 1.01d removed an attachment of type application/x-gzip which had a name of bug.tgz]