[dpdk-dev] [dpdk-virtio] Performance tuning for dpdk with virtio?

Clarylin L clearasu at gmail.com
Fri Jul 17 20:03:15 CEST 2015


I am running dpdk with a virtual guest as a L2 forwarder.

If the virtual guest is on passthrough, dpdk can achieve around 10G
throughput. However if the virtual guest is on virtio, dpdk achieves just
150M throughput, which is a huge degrade. Any idea what could be the cause
of such poor performance on virtio? and any performance tuning techniques I
could try? Thanks a lot!

lab at vpc-2:~$ ps aux | grep qemu

libvirt+ 12020  228  0.0 102832508 52860 ?     Sl   14:54  61:06
*qemu*-system-x86_64
-enable-kvm -name dpdk-perftest -S -machine
pc-i440fx-trusty,accel=kvm,usb=off,mem-merge=off -cpu host -m 98304
-mem-prealloc -mem-path /dev/hugepages/libvirt/*qemu* -realtime mlock=off
-smp 24,sockets=2,cores=12,threads=1 -numa
node,nodeid=0,cpus=0-11,mem=49152 -numa node,nodeid=1,cpus=12-23,mem=49152
-uuid eb5f8848-9983-4f13-983c-e3bd4c59387d -no-user-config -nodefaults
-chardev socket,id=charmonitor,path=/var/lib/libvirt/*qemu*/dpdk-perftest.monitor,server,nowait
-mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc -no-shutdown
-boot strict=on -device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 -drive
file=/var/lib/libvirt/images/dpdk-perftest-hda.img,if=none,id=drive-ide0-0-0,format=qcow2
-device
ide-hd,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0,bootindex=1 -drive
file=/var/lib/libvirt/images/dpdk-perftest-hdb.img,if=none,id=drive-ide0-0-1,format=qcow2
-device ide-hd,bus=ide.0,unit=1,drive=drive-ide0-0-1,id=ide0-0-1 -drive
if=none,id=drive-ide0-1-0,readonly=on,format=raw -device
ide-cd,bus=ide.1,unit=0,drive=drive-ide0-1-0,id=ide0-1-0,bootindex=2
-netdev tap,fd=24,id=hostnet0,vhost=on,vhostfd=25 -device
virtio-net-pci,netdev=hostnet0,id=net0,mac=52:54:00:45:ff:5e,bus=pci.0,addr=0x5
-netdev
tap,fds=26:27:28:29:30:31:32:33,id=hostnet1,vhost=on,vhostfds=34:35:36:37:38:39:40:41
-device
virtio-net-pci,mq=on,vectors=17,netdev=hostnet1,id=net1,mac=52:54:00:7e:b5:6b,bus=pci.0,addr=0x6
-netdev
tap,fds=42:43:44:45:46:47:48:49,id=hostnet2,vhost=on,vhostfds=50:51:52:53:54:55:56:57
-device
virtio-net-pci,mq=on,vectors=17,netdev=hostnet2,id=net2,mac=52:54:00:f1:a5:20,bus=pci.0,addr=0x7
-chardev pty,id=charserial0 -device
isa-serial,chardev=charserial0,id=serial0 -chardev pty,id=charserial1
-device isa-serial,chardev=charserial1,id=serial1 -vnc 127.0.0.1:0 -device
cirrus-vga,id=video0,bus=pci.0,addr=0x2 -device
i6300esb,id=watchdog0,bus=pci.0,addr=0x3 -watchdog-action reset -device
virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x4


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