[Qemu-devel] Re: [PATCH v5 0/4] virtio: Use ioeventfd for virtqueue notify

[Stefan Hajnoczi]

Fresh results:

192.168.0.1 - host (runs netperf)
192.168.0.2 - guest (runs netserver)

host$ src/netperf -H 192.168.0.2 -- -m 200

ioeventfd=on
TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 192.168.0.2
(192.168.0.2) 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    200    10.00    1759.25

ioeventfd=off
TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 192.168.0.2
(192.168.0.2) 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    200    10.00    1757.15

The results vary approx +/- 3% between runs.

Invocation:
$ x86_64-softmmu/qemu-system-x86_64 -m 4096 -enable-kvm -netdev
type=tap,id=net0,ifname=tap0,script=no,downscript=no -device
virtio-net-pci,netdev=net0,ioeventfd=on|off -vnc :0 -drive
if=virtio,cache=none,file=$HOME/rhel6-autobench-raw.img

I am running qemu.git with v5 patches, based off
36888c6335422f07bbc50bf3443a39f24b90c7c6.

Host:
1 Quad-Core AMD Opteron(tm) Processor 2350 @ 2 GHz
8 GB RAM
RHEL 6 host

Next I will try the patches on latest qemu-kvm.git

Stefan