Tested using pktgen.

cpuinfo:
processor       : 0
vendor_id       : AuthenticAMD
cpu family      : 6
model           : 8
model name      : AMD Geode NX
stepping        : 1
cpu MHz         : 1397.641
cache size      : 256 KB
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 1
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 mmx fxsr sse syscall mp mmxext 3dnowext 3dnow ts fid vid
bogomips        : 2796.00
clflush size    : 32

meminfo:
MemTotal:       907092 kB


Results in pps. Sending 400000 60-byte packets.
Other than Iteration 5 and 6, there is 1 interrupt per packet.

Iteration 0 (replace TxIDLE with TxOK):
62222, 62052, 62335

Iteration 1 (optimize sis900_start_xmit):
148815, 148815, 148829

Iteration 2 (convert Rx to NAPI):
148669, 148635, 148677

Iteration 3 (remove tx_full dev state variable):
148677, 148528, 148532

Iteration 4 (optimize finish_xmit):
148677, 148676, 148689

Iteration 5 (move tx completion code into NAPI poll):
147751, 147658, 147809
Interrupts:
359270, 360747, 358010

Iteration 6 (cleanup + rotting packet handling + rx optimization):
148652, 148680, 148681
Interrupts:
399927, 399841, 399835