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SubjectRE: [RFC PATCH] virtio-mmio: support for multiple irqs
Hi Shannon, 

>Type of backend bandwith(GBytes/sec)
>virtio-net 0.66
>vhost-net 1.49
>vhost-net with irqfd 2.01
>Test cmd: ./iperf -c -P 1 -i 10 -p 5001 -f G -t 60

Impressive results !
Could you please detail your setup ? which platform are you using and which GbE controller ?
As a reference, it would be good also to have result with an iperf to the HOST to see how far we are from a native configuration...

Also, I assume a pending Qemu patch is necessary to assign multiple irqs ? I'm correct ?

Thanks a lot,
Best regards

-----Message d'origine-----
De : Shannon Zhao []
Envoyé : mercredi 5 novembre 2014 09:00
À :
Cc :;;;; GAUGUEY Rémy 228890;;;;;
Objet : Re: [RFC PATCH] virtio-mmio: support for multiple irqs

On 2014/11/4 17:35, Shannon Zhao wrote:
> As the current virtio-mmio only support single irq, so some advanced
> features such as vhost-net with irqfd are not supported. And the net
> performance is not the best without vhost-net and irqfd supporting.
Hi Joel, Peter, Mst,

Some virtio-net with virtio-mmio performance data on ARM added as followed:

Type of backend bandwith(GBytes/sec)
virtio-net 0.66
vhost-net 1.49
vhost-net with irqfd 2.01

Test cmd: ./iperf -c -P 1 -i 10 -p 5001 -f G -t 60

From this test data, irqfd has great improvement (about 30%) on performance.
So maybe it's necessary to enable multiple irq support to make vhost-net with virtio-mmio on ARM be able to use irqfd.

How do you guys think? Look forward for your feedback.


> This patch support virtio-mmio to request multiple irqs like
> virtio-pci. With this patch and qemu assigning multiple irqs for
> virtio-mmio device, it's ok to use vhost-net with irqfd on arm/arm64.
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