Re: vhost + multiqueue + RSS question.

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On 11/17/2014 02:56 AM, Michael S. Tsirkin wrote:
> 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.

This sounds like a regression, which kernel/qemu version did you use?
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