Adaptive Interrupt & Flow control

what are they for? should they be disabled or enabled? VIA Rhine II Fast Ethernet Adapter 3.41.0.426

Physical Address: 00-16-EC-3E-62-F0
IP Address: 192.168.2.2
Subnet Mask: 255.255.255.0
Default Gateway: 192.168.2.1
DHCP Server: 192.168.2.1
Lease Obtained: 8/21/2012 12:02:46 AM
Lease Expires: 1/18/2038 9:14:07 PM
DNS Server: 192.168.2.1
WINS Server:

many thanks
mint