Hello! On 1/21/2016 7:51 AM, Clarylin L wrote: > I am running dpdk within a virtual guest as a L3 forwarder. > > > The VM has two ports connecting to two linux bridges (in turn connecting > two physical ports). DPDK is used to forward between these two ports (one > port connected to traffic generator and the other connected to sink). I > used iperf to test the throughput. > > > If the VM/DPDK is running on passthrough, it can achieve around 10G > end-to-end (from traffic generator to sink) throughput. However if the > VM/DPDK is running on virtio (virtio-net-pmd), it achieves just 150M > throughput, which is a huge degrade. > > > On the virtio, I also measured the throughput between the traffic generator > and its connected port on VM, as well as throughput between the sink and > it's VM port. Both legs show around 7.5G throughput. So I guess forwarding > within the VM (from one port to the other) would be a big killer of the > performance. > > > Any suggestion on how I can root cause the poor performance issue, or any > idea on performance tuning techniques for virtio? thanks a lot!
The L3 forwarder, you mentioned, is the l3fwd example in DPDK? If so, I doubt it can work well with virtio, see another thread "Add API to get packet type info". Thanks, Jianfeng
