[dpdk-dev] vhost-user performance.

[dpdk-dev] vhost-user performance.

[Tonghao Zhang]

hi,
I tested the vhost-user, but i dont get a better performance.
The test case is VM2VM which are in the same host.

if we use the vhost-net in kernel, we get a 20 Gbits/sec throughput,
but vhost-user is only 5Gits/sec.

vhost-net:
qemu-system-x86_64 -enable-kvm -m 1G -smp 4 \
-cpu host \
-netdev tap,ifname=tap0,id=hostnet0,vhost=on,script=no,downscript=no
-device virtio-net-pci,netdev=hostnet0,id=net0,mac=52:54:00:02:d9:01 \
-mem-prealloc \
-display none -nographic \
/root/zth/local/qemu-img/__centos7_base.img

vhost-user:
qemu-system-x86_64 -enable-kvm -m 1G -smp 1 \
-chardev socket,id=char1,path=/tmp/dpdkvhostclient0,server \
-netdev type=vhost-user,id=mynet1,chardev=char1,vhostforce \
-device virtio-net-pci,netdev=mynet1,mac=52:54:00:02:d9:01 \
-object memory-backend-file,id=mem0,size=1G,mem-path=/dev/hugepages,share=on \
-numa node,memdev=mem0,nodeid=0 \
-monitor unix:/var/run/qemu.sock,server,nowait \
-mem-prealloc \
-display none -nographic \
/root/zth/local/qemu-img/__centos7_base.img


The vhost-user does't do better in the VM2VM case ?