Hellow everyone, I have a question regarding l2fwd in VM. In my environment, about half of received packets are sent but remaining half are dropped so I get Tx: 14.88Mpps Rx: 7.4Mpps rate for 64 bytes packets at the traffic generator machine.
On the other hand, I get Tx: 14.88Mpps Rx: 13.47Mpps using l2fwd in Host machine only. Something is wrong with my setting or that performance is no problem for VM? If there is a lack in my information, please let me know. It will be a great help if anyone advise me!! My environment is below. Both case 1 and 2 get same result where rate is Tx: 14.88Mpps Rx: 7.4Mpps. ****** ==Host machine OS: Ubuntu 12.04 CPU: Xeon E5-2670 (8C/2.60GHz/20M) RAM: 32GB NIC: X520-DA2(dual port) Kernel: 3.11.0 hugepages=1024, intel_iommu=on, iommu=pt, pci=assign-busses qemu-kvm-0.14.0 [case1] VF0 and VF2 belong to PF0 VF1 and VF3 belong to PF1 /usr/local/kvm/bin/qemu-system-x86_64 -hda ./vm1.img \ -m 4096 -cpu host -smp 4 -boot c -k ja -name m2_vm1 \ -monitor telnet::4444,server,nowait -vnc :1 -daemonize \ -device pci-assign,host=02:10.0 \ -device pci-assign,host=02:10.1 \ -device pci-assign,host=02:10.2 \ -device pci-assign,host=02:10.3 [case1] VF0 belong to PF0 VF1 belong to PF1 /usr/local/kvm/bin/qemu-system-x86_64 -hda ./vm1.img \ -m 4096 -cpu host -smp 4 -boot c -k ja -name m2_vm1 \ -monitor telnet::4444,server,nowait -vnc :1 -daemonize \ -device pci-assign,host=02:10.0 \ -device pci-assign,host=02:10.1 ==Virtual machine OS: Ubuntu 12.04 Kernel: 3.11.0 DPDK: 1.6.0 [case1] l2fwd -c f -n 4 -- -q 1 -p 0x3 [case2] l2fwd -c 3 -n 4 -- -q 1 -p 0x3 ==Traffic generator machine Pktgen-DPDK pktgen>set mac 0 <MAC addr of VM's connected port> pktgen>start 0 ****** Regards, nks
