Re: [Qemu-devel] The status about vhost-net on kvm-arm?

[Nikolay Nikolaev]

On Tue, Aug 12, 2014 at 6:47 PM, Nikolay Nikolaev
<address@hidden> wrote:
>
> Hello,
>
>
> On Tue, Aug 12, 2014 at 5:41 AM, Li Liu <address@hidden> wrote:
> >
> > Hi all,
> >
> > Is anyone there can tell the current status of vhost-net on kvm-arm?
> >
> > Half a year has passed from Isa Ansharullah asked this question:
> > http://www.spinics.net/lists/kvm-arm/msg08152.html
> >
> > I have found two patches which have provided the kvm-arm support of
> > eventfd and irqfd:
> >
> > 1) [RFC PATCH 0/4] ARM: KVM: Enable the ioeventfd capability of KVM on ARM
> > http://lists.gnu.org/archive/html/qemu-devel/2014-01/msg01770.html
> >
> > 2) [RFC,v3] ARM: KVM: add irqfd and irq routing support
> > https://patches.linaro.org/32261/
> >
> > And there's a rough patch for qemu to support eventfd from Ying-Shiuan Pan:
> >
> > [Qemu-devel] [PATCH 0/4] ioeventfd support for virtio-mmio
> > https://lists.gnu.org/archive/html/qemu-devel/2014-02/msg00715.html
> >
> > But there no any comments of this patch. And I can found nothing about qemu
> > to support irqfd. Do I lost the track?
> >
> > If nobody try to fix it. We have a plan to complete it about virtio-mmio
> > supporing irqfd and multiqueue.
> >
> >
>
> we at Virtual Open Systems did some work and tested vhost-net on ARM
> back in March.
> The setup was based on:
>  - host kernel with our ioeventfd patches:
> http://www.spinics.net/lists/kvm-arm/msg08413.html
>
> - qemu with the aforementioned patches from Ying-Shiuan Pan
> https://lists.gnu.org/archive/html/qemu-devel/2014-02/msg00715.html
>
> The testbed was ARM Chromebook with Exynos 5250, using a 1Gbps USB3
> Ethernet adapter connected to a 1Gbps switch. I can't find the actual
> numbers but I remember that with multiple streams the gain was clearly
> seen. Note that it used the minimum required ioventfd implementation
> and not irqfd.
>
> I guess it is feasible to think that it all can be put together and
> rebased + the recent irqfd work. One can achiev even better
> performance (because of the irqfd).
>

Managed to replicate the setup with the old versions e used in March:

Single stream from another machine to chromebook with 1Gbps USB3
Ethernet adapter.
iperf -c <address> -P 1 -i 1 -p 5001 -f k -t 10
to HOST: 858316 Kbits/sec
to GUEST: 761563 Kbits/sec

10 parallel streams
iperf -c <address> -P 10 -i 1 -p 5001 -f k -t 10
to HOST: 842420 Kbits/sec
to GUEST: 625144 Kbits/sec

>
> >
> >
> >
> >
> >
> > _______________________________________________
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>
>
> regards,
> Nikolay Nikolaev
> Virtual Open Systems