Hi Nikolay, >From this mail I know you guys have done some work about ioeventfd support on kvm-arm before. Do you have plan to rework your patch based on the new branch? If not, I think we should send a patch to make eventfd support on kvm-arm and make vhost-net work. Based on the new kvm-arm branch with Eric's patch "ARM: KVM: add irqfd support" and eventfd patch in both kvm and qemu we have run virtio-mmio with vhost-net. And with our patch to enable virtio-mmio multiple irq and irqfd support, it work well to run vhost-net with irqfd on ARM. The performance test data as followed : Type of backend bandwith(GBytes/sec) (From Host to Guest) virtio-net 0.66 vhost-net 1.49 vhost-net with irqfd 2.01 >From this test data, vhost-net and irqfd have great improvement on performance. So maybe it's necessary to enable ioeventfd make vhost-net work with virtio-mmio on ARM. It's ok if I send these patches? Thanks, Shannon On 2014/8/12 23:47, Nikolay Nikolaev wrote: > Hello, > > > On Tue, Aug 12, 2014 at 5:41 AM, Li Liu <john.liuli@xxxxxxxxxx> 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). > >> >> >> >> >> >> _______________________________________________ >> kvmarm mailing list >> kvmarm@xxxxxxxxxxxxxxxxxxxxx >> https://lists.cs.columbia.edu/mailman/listinfo/kvmarm > > > regards, > Nikolay Nikolaev > Virtual Open Systems > _______________________________________________ > kvmarm mailing list > kvmarm@xxxxxxxxxxxxxxxxxxxxx > https://lists.cs.columbia.edu/mailman/listinfo/kvmarm > > -- Shannon -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
