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[Qemu-devel] Re: [PATCH v5 0/4] virtio: Use ioeventfd for virtqueue noti
From: |
Michael S. Tsirkin |
Subject: |
[Qemu-devel] Re: [PATCH v5 0/4] virtio: Use ioeventfd for virtqueue notify |
Date: |
Mon, 13 Dec 2010 18:00:07 +0200 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
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 <address@hidden> 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.
> I am wondering if the iothread differences between qemu.git and
> qemu-kvm.git can explain the performance results we see. In
> particular, qemu.git produces the same (high) throughput whether
> ioeventfd is on or off.
>
> Stefan
- [Qemu-devel] Re: [PATCH v5 0/4] virtio: Use ioeventfd for virtqueue notify, (continued)
- [Qemu-devel] Re: [PATCH v5 0/4] virtio: Use ioeventfd for virtqueue notify, Michael S. Tsirkin, 2010/12/12
- [Qemu-devel] Re: [PATCH v5 0/4] virtio: Use ioeventfd for virtqueue notify, Michael S. Tsirkin, 2010/12/12
- [Qemu-devel] Re: [PATCH v5 0/4] virtio: Use ioeventfd for virtqueue notify, Michael S. Tsirkin, 2010/12/12
- [Qemu-devel] Re: [PATCH v5 0/4] virtio: Use ioeventfd for virtqueue notify, Stefan Hajnoczi, 2010/12/13
- [Qemu-devel] Re: [PATCH v5 0/4] virtio: Use ioeventfd for virtqueue notify, Michael S. Tsirkin, 2010/12/13
- [Qemu-devel] Re: [PATCH v5 0/4] virtio: Use ioeventfd for virtqueue notify, Stefan Hajnoczi, 2010/12/13
- [Qemu-devel] Re: [PATCH v5 0/4] virtio: Use ioeventfd for virtqueue notify, Michael S. Tsirkin, 2010/12/13
- [Qemu-devel] Re: [PATCH v5 0/4] virtio: Use ioeventfd for virtqueue notify, Michael S. Tsirkin, 2010/12/13
- [Qemu-devel] Re: [PATCH v5 0/4] virtio: Use ioeventfd for virtqueue notify, Stefan Hajnoczi, 2010/12/13
- [Qemu-devel] Re: [PATCH v5 0/4] virtio: Use ioeventfd for virtqueue notify, Stefan Hajnoczi, 2010/12/13
- [Qemu-devel] Re: [PATCH v5 0/4] virtio: Use ioeventfd for virtqueue notify,
Michael S. Tsirkin <=
- [Qemu-devel] Re: [PATCH v5 0/4] virtio: Use ioeventfd for virtqueue notify, Stefan Hajnoczi, 2010/12/13
- [Qemu-devel] Re: [PATCH v5 0/4] virtio: Use ioeventfd for virtqueue notify, Michael S. Tsirkin, 2010/12/13
- [Qemu-devel] Re: [PATCH v5 0/4] virtio: Use ioeventfd for virtqueue notify, Michael S. Tsirkin, 2010/12/13
- [Qemu-devel] Re: [PATCH v5 0/4] virtio: Use ioeventfd for virtqueue notify, Stefan Hajnoczi, 2010/12/13
- [Qemu-devel] Re: [PATCH v5 0/4] virtio: Use ioeventfd for virtqueue notify, Stefan Hajnoczi, 2010/12/13
- [Qemu-devel] Re: [PATCH v5 0/4] virtio: Use ioeventfd for virtqueue notify, Michael S. Tsirkin, 2010/12/13
- [Qemu-devel] Re: [PATCH v5 0/4] virtio: Use ioeventfd for virtqueue notify, Stefan Hajnoczi, 2010/12/15
- [Qemu-devel] Re: [PATCH v5 0/4] virtio: Use ioeventfd for virtqueue notify, Stefan Hajnoczi, 2010/12/15
- [Qemu-devel] Re: [PATCH v5 0/4] virtio: Use ioeventfd for virtqueue notify, Michael S. Tsirkin, 2010/12/15
- [Qemu-devel] Re: [PATCH v5 0/4] virtio: Use ioeventfd for virtqueue notify, Michael S. Tsirkin, 2010/12/15