I'll set some time aside next week to drill into that. I certainly don't recall seeing any utilization issues when I was first troubleshooting.
On 24 January 2014 07:26, Salvatore Orlando <sorla...@nicira.com> wrote: > Hi, > > My expertise on the subject is pretty much zero, but the performance loss > (which I think is throughput loss) is so blatant that perhaps there's more > than the MTU issue. From what Robert writes, GRO definitely plays a role > too. > > My only suggestion would be to route the question to ovs-discuss in order to > get some help in precisely understanding what's going on. > In order to understand the relationship with GRO, what are the CPU usage > levels on the receiving node with and without GRO enabled? > > Salvatore > > > On 22 January 2014 17:26, Rick Jones <rick.jon...@hp.com> wrote: >> >> On 01/22/2014 03:01 AM, Robert Collins wrote: >>> >>> I certainly think having the MTU set to the right value is important. >>> I wonder if there's a standard way we can signal the MTU (e.g. in the >>> virtio interface) other than DHCP. Not because DHCP is bad, but >>> because that would work with statically injected network configs as >>> well. >> >> >> Can LLDP be used here somehow? It might require "stretching" things a >> bit - not all LLDP agents seem to include the information, and it might >> require some sort of "cascade." It would also require the VM to pay >> attention to the frames as they arrive, but in broad, hand-waving, blue-sky >> theory it could communicate maximum frame size information within the >> broadcast domain. >> >> rick >> >> >> _______________________________________________ >> OpenStack-dev mailing list >> OpenStack-dev@lists.openstack.org >> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev > > > > _______________________________________________ > OpenStack-dev mailing list > OpenStack-dev@lists.openstack.org > http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev > -- Robert Collins <rbtcoll...@hp.com> Distinguished Technologist HP Converged Cloud _______________________________________________ OpenStack-dev mailing list OpenStack-dev@lists.openstack.org http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev