On 10/06/2015 12:48, "Gray, Mark D" <mark.d.g...@intel.com> wrote: > >The vhost port won't generate an RSS hash because it is a virtual NIC. > >> > >> It doesn't cause a problem, just make the pkt fall into a slow path, >>should we > >> fix it?
Thanks for investigating this. We should definitely fix it. > >> The flag ol_flags may be useful for OVS or let DPDK fix this in vhost >>rcv. > > > >How do you propose that this would work? The RSS would still have to be > >generated in software. > >> A simple solution would be to reset the RSS hash inside netdev_dpdk_vhost_rxq_recv(). Other netdev providers that do not support reading the RSS hash (netdev-linux, netdev-bsd) call dp_packet_set_rss_hash(pkt, 0) on every received packet. This would probably have a small impact on performance, but it's better than trashing the exact match cache. I don't believe there's anything that DPDK can do here (like resetting the hash when the packet is freed), but please correct me if I'm wrong. Thoughts? > >> _______________________________________________ > >> dev mailing list > >> dev@openvswitch.org > >> >>https://urldefense.proofpoint.com/v2/url?u=http-3A__openvswitch.org_mailm >>an_listinfo_dev&d=BQIGaQ&c=Sqcl0Ez6M0X8aeM67LKIiDJAXVeAw-YihVMNtXt-uEs&r= >>SmB5nZacmXNq0gKCC1s_Cw5yUNjxgD4v5kJqZ2uWLlE&m=3J9Uq22LocYzdOk0zaAg-I-BXRc >>Q0C4xUYMUbB04iLg&s=vWwQ3E9pNyybTCXbUTmvxkrUiP-Y30yTAB6RBxe2DOI&e= > >_______________________________________________ >dev mailing list >dev@openvswitch.org >https://urldefense.proofpoint.com/v2/url?u=http-3A__openvswitch.org_mailma >n_listinfo_dev&d=BQIGaQ&c=Sqcl0Ez6M0X8aeM67LKIiDJAXVeAw-YihVMNtXt-uEs&r=Sm >B5nZacmXNq0gKCC1s_Cw5yUNjxgD4v5kJqZ2uWLlE&m=3J9Uq22LocYzdOk0zaAg-I-BXRcQ0C >4xUYMUbB04iLg&s=vWwQ3E9pNyybTCXbUTmvxkrUiP-Y30yTAB6RBxe2DOI&e= _______________________________________________ dev mailing list dev@openvswitch.org http://openvswitch.org/mailman/listinfo/dev
