I meet similar issue with KNI connected VM, but In my case I run 2 VM guests based on KNI and measure network performance between them:
sesion: ### I just started demo with kni ./build/kni -c 0xf0 -n 4 -- -P -p 0x3 --config="(0,4,6,8),(1,5,7,9)" ###starting... ###set kni on vEthX to connect (as in example) echo 1 > /sys/class/net/vEth0_0/sock_en fd=`cat /sys/class/net/vEth0_0/sock_fd` ## start first guest VM kvm -nographic -name vm1 -cpu host -m 2048 -smp 1 -hda .../debian_squeeze_amd64.qcow2 -netdev tap,fd=$fd,id=hostnet1,vhost=on -device virtio-net-pci,netdev=hostnet1,id=net1,bus=pci.0,addr=0x4 ## start second guest VM echo 1 > /sys/class/net/vEth1_0/sock_en fd=`cat /sys/class/net/vEth1_0/sock_fd` kvm -nographic -name vm2 -cpu host -m 2048 -smp 1 -hda .../debian_squeeze2_amd64.qcow2 -netdev tap,fd=$fd,id=hostnet1,vhost=on -device virtio-net-pci,netdev=hostnet1,id=net1,bus=pci.0,addr=0x4 ###END: ustawiam 2 kvm z virtual guestem ### first VM node start server netserver -p 22113 ### performance from second VM guest to first (server) using netperf root at debian-amd64:~# netperf -H 10.0.0.200 -p 22113 -t TCP_STREAM MIGRATED TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 10.0.0.200 () port 0 AF_INET Recv Send Send Socket Socket Message Elapsed Size Size Size Time Throughput bytes bytes bytes secs. 10^6bits/sec 87380 16384 16384 10.01 219.86 So I got 220M between two VM using KNI, but it was only experiment (I didn't analyze it deeply) On Wed, Jun 24, 2015 at 7:58 AM, Vithal S Mohare <vmohare at arubanetworks.com> wrote: > Hi, > > I am running DPDP KNI application on linux (3.18 kernel) VM (ESXi 5.5), > directly connected to another linux box to measure throughput using iperf > tool. Link speed: 1Gbps. Maximum throughput I get is 50% with 1470 > Bytes. With 512B pkt sizes, throughput drops to 282 Mbps. > > Tried using KNI loopback modes (and traffic from Ixia), but no change in > throughput. > > KNI is running in single thread mode. One lcore for rx, one for tx and > another fir kni thread. > > Is the result expected? Has anybody got better numbers? Appreciate for > input and relevant info. > > Thanks, > -Vithal >
