> In this combination of hardware and in this forwarding test > copybreak is bad but prefetching helps. > > e1000 vanilla 1150 kpps > e1000 6.2.15 1084 > e1000 6.2.15 copybreak disabled 1216 > e1000 6.2.15 copybreak disabled and no rx prefetch 1097 > This is what we are seeing as well. The copybreak performance makes sense since every packet in this test would be copied increasing the CPU to probably where it's pegged (that's what we see). The prefetching does help in almost of cases we've run and we have not seen the prefetch hurt anywhere.
So we still need to see a case where performance is hurt by the prefetching. We have some data coming from another group here at Intel next week which we'll share once we have it which also shows the performance gains with prefetching. Cheers, John - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
