Regarding NAPI performance

[Robert Olsson <Robert.Olsson@xxxxxxxxxxx>]

prashant s writes:

 > driver without NAPI (rtl8139too in 2.4.20 linux)
 > showed 72Mbps and the NAPI driver (rtl8139too in
 > 2.6.3) showed 94Mbps,both having their ring size at
 > 8k.The packet size i used was same as before.
 > why is this difference when the ring size is reduced.

 Well a good question. I would expect non-NAPI to perform
 equal to NAPI at low network load even w. small RX-rings.
 
 Any difference interrupt delay? NAPI can live without 
 delay. Or some other driver difference? I have no experience 
 with rtl8139too myself.

 Cheers.
                                        --ro