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

["Michael S. Tsirkin" <mst@redhat.com>]

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

-- 
MST