[updated with new ifconfs/iperf] config. causing 300Mbps drop in lan performance

cmcdonald

You could try disabling the hardware VLAN tagging on the 82574 and do it in software instead. I believe the command for that would be:
ifconfig em3 -VLAN_HWTAGGING
Interestingly I see that it also supports VLAN_HWFILTER which em2 does not. Perhaps the FreeBSD driver in 2.0.X attempts to use this feature and it ends up actually slowing the connection?

Stve

I'm not quite following you. Both em2 and em3 show VLAN_HWFILTER as an option

em3: flags=8843 <up,broadcast,running,simplex,multicast>metric 0 mtu 1500
	options=5219b<rxcsum,txcsum,vlan_mtu,vlan_hwtagging,vlan_hwcsum,tso4,wol_magic,vlan_hwfilter,vlan_hwtso></rxcsum,txcsum,vlan_mtu,vlan_hwtagging,vlan_hwcsum,tso4,wol_magic,vlan_hwfilter,vlan_hwtso></up,broadcast,running,simplex,multicast>

em2: flags=8843 <up,broadcast,running,simplex,multicast>metric 0 mtu 1500
	options=5209b<rxcsum,txcsum,vlan_mtu,vlan_hwtagging,vlan_hwcsum,wol_magic,vlan_hwfilter,vlan_hwtso></rxcsum,txcsum,vlan_mtu,vlan_hwtagging,vlan_hwcsum,wol_magic,vlan_hwfilter,vlan_hwtso></up,broadcast,running,simplex,multicast>

stephenw10

Oops! My mistake, not sure how that happened. :-[

Steve