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...hanks a lot, Best regards R?my -----Message d'origine----- De?: Shannon Zhao [mailto:zhaoshenglong at huawei.com] Envoy??: mercredi 5 novembre 2014 09:00 ??: linux-kernel at vger.kernel.org Cc?: mst at redhat.com; peter.maydell at linaro.org; john.liuli at huawei.com; joel.schopp at amd.com; GAUGUEY R?my 228890; qemu-devel at nongnu.org; n.nikolaev at virtualopensystems.com; virtualization at lists.linux-foundation.org; peter.huangpeng at huawei.com; hangaohuai at huawei.com Objet?: Re: [RFC PATCH] virtio-mmio: support for multiple irqs On 2014/11/4 17:35, Shannon Zhao wrote: > As the cur...

...hanks a lot, Best regards R?my -----Message d'origine----- De?: Shannon Zhao [mailto:zhaoshenglong at huawei.com] Envoy??: mercredi 5 novembre 2014 09:00 ??: linux-kernel at vger.kernel.org Cc?: mst at redhat.com; peter.maydell at linaro.org; john.liuli at huawei.com; joel.schopp at amd.com; GAUGUEY R?my 228890; qemu-devel at nongnu.org; n.nikolaev at virtualopensystems.com; virtualization at lists.linux-foundation.org; peter.huangpeng at huawei.com; hangaohuai at huawei.com Objet?: Re: [RFC PATCH] virtio-mmio: support for multiple irqs On 2014/11/4 17:35, Shannon Zhao wrote: > As the cur...

Hi R?my, On 2014/11/5 16:26, GAUGUEY R?my 228890 wrote: > 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 192.168.0.2 -P 1 -i 10 -p 5001 -f G -t 60 > &...

On 11/05/2014 03:12 AM, Shannon Zhao wrote: > Hi R?my, > > On 2014/11/5 16:26, GAUGUEY R?my 228890 wrote: >> 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 192.168.0.2 -P 1 -...

On 11/05/2014 03:12 AM, Shannon Zhao wrote: > Hi R?my, > > On 2014/11/5 16:26, GAUGUEY R?my 228890 wrote: >> 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 192.168.0.2 -P 1 -...

.... >> >> It's easy to implement irqfd support with PCI MSI-X. But till >> now arm32 do not provide equivalent mechanism to let a device >> allocate multiple interrupts. And even the aarch64 provid LPI >> but also not available in a short time. >> >> As Gauguey Remy said "Vhost does not emulate a complete virtio >> adapter but only manage virtqueue operations". Vhost module >> don't update the ISR register, so if with only one irq then it's >> no way to get the interrupt reason even we can inject the >> irq cor...

.... >> >> It's easy to implement irqfd support with PCI MSI-X. But till >> now arm32 do not provide equivalent mechanism to let a device >> allocate multiple interrupts. And even the aarch64 provid LPI >> but also not available in a short time. >> >> As Gauguey Remy said "Vhost does not emulate a complete virtio >> adapter but only manage virtqueue operations". Vhost module >> don't update the ISR register, so if with only one irq then it's >> no way to get the interrupt reason even we can inject the >> irq cor...

...vhost-net brings great performance improvements, almost 50%+. It's easy to implement irqfd support with PCI MSI-X. But till now arm32 do not provide equivalent mechanism to let a device allocate multiple interrupts. And even the aarch64 provid LPI but also not available in a short time. As Gauguey Remy said "Vhost does not emulate a complete virtio adapter but only manage virtqueue operations". Vhost module don't update the ISR register, so if with only one irq then it's no way to get the interrupt reason even we can inject the irq correctly. To get the interrupt reas...

...vhost-net brings great performance improvements, almost 50%+. It's easy to implement irqfd support with PCI MSI-X. But till now arm32 do not provide equivalent mechanism to let a device allocate multiple interrupts. And even the aarch64 provid LPI but also not available in a short time. As Gauguey Remy said "Vhost does not emulate a complete virtio adapter but only manage virtqueue operations". Vhost module don't update the ISR register, so if with only one irq then it's no way to get the interrupt reason even we can inject the irq correctly. To get the interrupt reas...

...improvements, almost 50%+. > > It's easy to implement irqfd support with PCI MSI-X. But till > now arm32 do not provide equivalent mechanism to let a device > allocate multiple interrupts. And even the aarch64 provid LPI > but also not available in a short time. > > As Gauguey Remy said "Vhost does not emulate a complete virtio > adapter but only manage virtqueue operations". Vhost module > don't update the ISR register, so if with only one irq then it's > no way to get the interrupt reason even we can inject the > irq correctly. Well...

...9;s easy to implement irqfd support with PCI MSI-X. But till > >> now arm32 do not provide equivalent mechanism to let a device > >> allocate multiple interrupts. And even the aarch64 provid LPI > >> but also not available in a short time. > >> > >> As Gauguey Remy said "Vhost does not emulate a complete virtio > >> adapter but only manage virtqueue operations". Vhost module > >> don't update the ISR register, so if with only one irq then it's > >> no way to get the interrupt reason even we can inject the &...

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. 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

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. 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