On Wed, May 23, 2018 at 02:08:19PM -0400, Dennis Dalessandro wrote: > On 5/23/2018 12:48 PM, Parav Pandit wrote: > >>- log_pmtu = ah->log_pmtu; > >>+ log_pmtu = ilog2(ah->pmtu); > >I don’t know if UD is widely used in IPoIB or not. > >But won't you have any performance impact by doing ilog2 on every work request? > >Just curious. > > It might just find more use with a larger MTU that allows better > performance. At least on mlx5 ipoib and netdev ip o ethernet performance are basically the same. The way to get good performance is to implement the IP offloads. As I've said before, if OPA cares about good ipoib performance then the hfi driver needs to implement the rdma_netdev interface for ipoib as well as for opa_vnic. But, increasing the allowed MTU is a reasonablish idea too.. Jason -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
