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

[Li Liu]

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
>> <address@hidden> wrote:
>>> 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
>> 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 (address@hidden)
> 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
>>>>> address@hidden
>>>>> https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
>>>>
>>>>
>>>> regards,
>>>> Nikolay Nikolaev
>>>> Virtual Open Systems
>>
>> .
>>
> 
> 
> 
> .
>