On 12/05/15 02:28, Marc Sune wrote: > > > On 12/05/15 01:18, Paul Emmerich wrote: >> Found a really simple solution that almost restores the original >> performance: just add a prefetch on alloc. For some reason, I assumed >> that this was already done since the troublesome commit I >> investigated mentioned something about prefetching... I guess the >> commit referred to the hardware prefetcher in the CPU. >> >> Adding an explicit prefetch command in the mbuf alloc function gives >> a throughput of 12.7/10.35 Mpps in my benchmark with the >> simple/full-featured tx path. >> >> DPDK 1.7.1 was at 14.1/10.7 Mpps. I guess I can live with that, since >> I'm primarily interested in the full-featured path and the drop from >> 10.7 to ~10.4 was due to another change. > > Maybe a stupid question; > > Does the performance of v1.7.1 also improve if you backport this patch > to it?
Self answered... split was done in 1.8, so it is indeed stupid. Marc > > Marc > >> >> Patch: https://github.com/dpdk-org/dpdk/pull/2 >> I also sent an email to the mailing list. >> >> I also think that the rx-path could also benefit from prefetching >> somewhere. >> >> >> Paul >> >
