I have a question related this topic. So How do you set the RSS Key on the Mellanox NIc? I mean from your Guest? If it being set as part of Host driver, is there a way to set it from Guest? I mean my guest will choose a RSS Key and will try to set on the Physical NIC. Thanks, Venkatesh -----Original Message----- From: kvm-owner@xxxxxxxxxxxxxxx [mailto:kvm-owner@xxxxxxxxxxxxxxx] On Behalf Of Michael S. Tsirkin Sent: Monday, November 17, 2014 12:26 AM To: Gleb Natapov Cc: kvm@xxxxxxxxxxxxxxx; Jason Wang; virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx Subject: Re: vhost + multiqueue + RSS question. On Sun, Nov 16, 2014 at 06:18:18PM +0200, Gleb Natapov wrote: > Hi Michael, > > I am playing with vhost multiqueue capability and have a question > about vhost multiqueue and RSS (receive side steering). My setup has > Mellanox > ConnectX-3 NIC which supports multiqueue and RSS. Network related > parameters for qemu are: > > -netdev tap,id=hn0,script=qemu-ifup.sh,vhost=on,queues=4 > -device virtio-net-pci,netdev=hn0,id=nic1,mq=on,vectors=10 > > In a guest I ran "ethtool -L eth0 combined 4" to enable multiqueue. > > I am running one tcp stream into the guest using iperf. Since there is > only one tcp stream I expect it to be handled by one queue only but > this seams to be not the case. ethtool -S on a host shows that the > stream is handled by one queue in the NIC, just like I would expect, > but in a guest all 4 virtio-input interrupt are incremented. Am I > missing any configuration? I don't see anything obviously wrong with what you describe. Maybe, somehow, same irqfd got bound to multiple MSI vectors? To see, can you try dumping struct kvm_irqfd that's passed to kvm? > -- > Gleb. -- 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 _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linuxfoundation.org/mailman/listinfo/virtualization
