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From: Gleb Natapov <gleb@cloudius-systems.com>
To: mst@redhat.com
Cc: kvm@vger.kernel.org
Subject: vhost + multiqueue + RSS question.
Date: Sun, 16 Nov 2014 18:18:18 +0200	[thread overview]
Message-ID: <20141116161818.GD7589@cloudius-systems.com> (raw)

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?

--
			Gleb.

             reply	other threads:[~2014-11-16 16:18 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-11-16 16:18 Gleb Natapov [this message]
2014-11-16 18:56 ` vhost + multiqueue + RSS question Michael S. Tsirkin
2014-11-17  4:54   ` Venkateswara Rao Nandigam
2014-11-17  5:39     ` Jason Wang
2014-11-17  5:30   ` Jason Wang
2014-11-17  7:26     ` Gleb Natapov
2014-11-17  7:44   ` Gleb Natapov
2014-11-17 10:38     ` Michael S. Tsirkin
2014-11-17 11:22       ` Gleb Natapov
2014-11-17 11:58         ` Michael S. Tsirkin
2014-11-17 12:22           ` Gleb Natapov
2014-11-18  1:37             ` Zhang Haoyu
2014-11-18  3:41               ` Jason Wang
2014-11-18  7:56                 ` Gleb Natapov
2014-11-18  3:37           ` Jason Wang
2014-11-18 11:05             ` Michael S. Tsirkin
2014-11-19  3:01               ` Jason Wang

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