Your 'Source' application, most likely, directs packets of the same flow to different TX queues. That's why most of pmd threads can't install a ukey and always executes a misses instead of emc hits.
Fix your 'Source'. Best regards, Ilya Maximets. On 29.12.2015 22:19, Mauricio Vásquez wrote: > Hello to all, > > I am performing some performance testing using OVS with DPDK and I am > having some issues when I change the number of PMD cores that ovs uses. > > The testing architecture consists of a source and sink processes, the > source allocates some packets from the memory pool at the beginning and > then sends them in an infinite loop, the sink process just receives the > packets and counts them. In between, there is a forwarder application that > just takes packets from a port and sends them into another. > > Source and sink are executed as secondary DPDK-processes while the > forwarding app is executed within a VM. Source and Sink are connected to > ovs using a dpdkr port each one, the VM is connected using two dpdkr ports, > it means that there are a total of 4 dpdkr ports involved. > > OpenFlow rules are configured to forward traffic in the following way: > Source -> Forwarder (app in the VM) -> Sink > > The testing machine has 10 physical cores, core 0 is available to the OS > while the others are isolated. Source, Sink and Forwarder are pinned to > different physical cores. The PMD cores assigned to OvS are independent > from the ones assigned to Source, Sink and Forwarder. > > We are trying to understand how the number of PMD cores affects the > performance. > With 1 and 2 cores assigned to OvS we get a performance of about 7 Mpps, > but when we use 3 or 4 cores the performance decreases to only 750 kpps. I > noticed that the core 0 (used by the OS) is used a 32%, additionally OvS > prints the messages > "ofproto_dpif_upcall(pmd119)|WARN|Dropped 13210124 log messages in last 60 > seconds (most recently, 0 seconds ago) due to excessive rate" > "ofproto_dpif_upcall(pmd119)|WARN|upcall_cb failure: ukey installation > fails" > > Does anyone know why this behaviour? > > PD: I'm using DPDK v2.1.0 and ovs commit > 15a0ca65f341c2298e571052eb68d8a282e853a5 > > Thank you very much for your help. > _______________________________________________ dev mailing list dev@openvswitch.org http://openvswitch.org/mailman/listinfo/dev
