On Mon, Dec 13, 2010 at 04:29:58PM +0000, Stefan Hajnoczi wrote: > On Mon, Dec 13, 2010 at 4:00 PM, Michael S. Tsirkin <m...@redhat.com> wrote: > > On Mon, Dec 13, 2010 at 03:27:06PM +0000, Stefan Hajnoczi wrote: > >> On Mon, Dec 13, 2010 at 1:36 PM, Michael S. Tsirkin <m...@redhat.com> > >> wrote: > >> > On Mon, Dec 13, 2010 at 03:35:38PM +0200, Michael S. Tsirkin wrote: > >> >> On Mon, Dec 13, 2010 at 01:11:27PM +0000, Stefan Hajnoczi wrote: > >> >> > 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 > >> >> > >> >> One interesting thing is that I put virtio-net earlier on > >> >> command line. > >> > > >> > Sorry I mean I put it after disk, you put it before. > >> > >> I can't find a measurable difference when swapping -drive and -netdev. > >> > >> Can you run the same test with vhost? I assume it still outperforms > >> userspace virtio for small message sizes? I'm interested because that > >> also uses ioeventfd. > > > > Seems to work same as ioeventfd. > > vhost performs the same as ioeventfd=on? And that means slower than > ioeventfd=off? > > Stefan
Yes. -- MST
