Hi Xiaoye, > Is there any way to disable this batching mechanism in the ovs kernel so that > each upcall only contains one packet? Batching is a mechanism of the user space upcall handler rather than OVS kernel. To disable it you can change below macro in ofproto/ofproto-dpif-upcall.h: #define FLOW_MISS_MAX_BATCH 50 => 1
However, I wonder how would batching affect your RTT result. On Wed, Jan 15, 2014 at 5:11 PM, Ben Pfaff <[email protected]> wrote: > As the rate > increases, I guess that a batch contains more than one packet, and > it's likely that the batches mix up SYNs and SYN-ACKs, possibly > reducing the latency. @Ben, even if the batches mix up SYNs and SYN-ACKs, they are from different Flows. For SYN and SYN-ACK pairs of each single flow, they can never be mixed in the same batch, because SYN-ACK is not sent out until SYN is delivered to the receiver. So in my opinion, batching can improve the whole throughput but cannot explain the better STT. Did I miss anything here? @Xiaoye, maybe you can change FLOW_MISS_MAX_BATCH to different numbers to verify. Best regards, Han _______________________________________________ discuss mailing list [email protected] http://openvswitch.org/mailman/listinfo/discuss
