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 SendSend
Socket Socket Message Elapsed
Size SizeSize Time Throughput
bytes bytes bytessecs.10^6bits/sec
87380 16384 1638410.01 219.86
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
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
>
