On 2014/8/12 23:47, Nikolay Nikolaev wrote: > Hello, > > > On Tue, Aug 12, 2014 at 5:41 AM, Li Liu <john.li...@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. >
Yeah, we have roughly tested vhost-net without irqfd and get the same result. And now try to see what will happen with 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 >> kvm...@lists.cs.columbia.edu >> https://lists.cs.columbia.edu/mailman/listinfo/kvmarm > > > regards, > Nikolay Nikolaev > Virtual Open Systems > > . >
