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

[Yingshiuan Pan <yingshiuan.pan@gmail.com>]

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Hi, Li,

It's ok, I did get those mails from mailing list. I guess it was because I
did not subscribe some of mailing lists.

Currently, I think I will not have any plan to renew my patcheset since I
have resigned from my previous company, I do not have Cortex-A15 platform
to test/verify.

I'm fine with that, it would be great if you or someone can take it and
improve it.
Thanks.

----
Best Regards,
Yingshiuan Pan


2014-08-15 11:04 GMT+08:00 Li Liu <john.liuli@huawei.com>:

> Hi Ying-Shiuan Pan,
>
> I don't know why for missing your mail in mailbox. Sorry about that.
> The results of vhost-net performance have been attached in another mail.
>
> Do you have a plan to renew your patchset to support irqfd. If not,
> we will try to finish it based on yours.
>
> On 2014/8/14 11:50, Li Liu wrote:
> >
> >
> > On 2014/8/13 19:25, Nikolay Nikolaev wrote:
> >> On Wed, Aug 13, 2014 at 12:10 PM, Nikolay Nikolaev
> >> <n.nikolaev@virtualopensystems.com> wrote:
> >>> On Tue, Aug 12, 2014 at 6:47 PM, Nikolay Nikolaev
> >>> <n.nikolaev@virtualopensystems.com> 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.
> >>>>
> >>>> 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
> >> to GUEST vhost=off: 508150 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
> >> to GUEST vhost=off: 425276 Kbits/sec
> >
> > I have tested the same cases on a Hisilicon board (Cortex-A15@1G)
> > with Integrated 1Gbps Ethernet adapter.
> >
> > iperf -c <address> -P 1 -i 1 -p 5001 -f M -t 10
> > to HOST: 906 Mbits/sec
> > to GUEST: 562 Mbits/sec
> > to GUEST vhost=off: 340 Mbits/sec
> >
> > 10 parallel streams, the performance gets <10% plus:
> > iperf -c <address> -P 10 -i 1 -p 5001 -f M -t 10
> > to HOST: 923 Mbits/sec
> > to GUEST: 592 Mbits/sec
> > to GUEST vhost=off: 364 Mbits/sec
> >
> > I't easy to see vhost-net brings great performance improvements,
> > almost 50%+.
> >
> > Li.
> >
> >>>
> >>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>> _______________________________________________
> >>>>> 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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