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

[Ying-Shiuan Pan <yingshiuan.pan@gmail.com>]

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I'm so glad to see my patches also work in your environment!!
That's really exciting.
I'm also wondering what will happen if integrating with irqfd.

BTW, would share your performance number?

----
Best Regards,
潘穎軒 Yingshiuan Pan


2014-08-13 10:23 GMT+08:00 Li Liu <john.liuli@huawei.com>:

>
>
> On 2014/8/12 23:47, Nikolay Nikolaev wrote:
> > Hello,
> >
> >
> > On Tue, Aug 12, 2014 at 5:41 AM, Li Liu <john.liuli@huawei.com> 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.
> >
>
> Yeah, we have roughly tested vhost-net without irqfd and get the same
> result. And now try to see what will happen with 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).
> >
> >>
> >>
> >>
> >>
> >>
> >> _______________________________________________
> >> kvmarm mailing list
> >> kvmarm@lists.cs.columbia.edu
> >> https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
> >
> >
> > regards,
> > Nikolay Nikolaev
> > Virtual Open Systems
> >
> > .
> >
>
>
>

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