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

[Michael S. Tsirkin]

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.

> Since iobus scan is linear for now, I wonder if this might
> possibly matter.
> 
> -- 
> MST