[cc lang='bash']
# check speed, duplex, driver
\$ ethtool eth0
\$ lspci | grep -i eth
\$ ethtool -i eth0
\$ modinfo e1000e

# check irq balance to all cores
\$ cat /proc/interrupts | grep 'CPU\|eth0'

# check packet rate
\$ sar -n DEV 1

# check packet drop - low layers
\$ ifconfig eth0 | grep -i drop
\$ ethtool -S eth0

# check packet drop - high layers
\$ netstat -s | grep -i drop
[/cc]