On 06/04/2014 15:06, Simon Chen wrote:
Hello, I am using QEMU 1.6.0 on Linux 3.10.21. My VMs are using vhost-net in a typical OpenStack setup: VM1->tap->linux bridge->OVS->host1->physical network->host2->OVS->linux bridge->tap->VM2. It seems that under heavy network load, the vhost-[pid] processes on the receiving side is using 100% CPU. The sender side has over 85% utilized. I am seeing unsatisfactory VM to VM network performance (using iperf 16 concurrent TCP connections, I can only get 1.5Gbps, while I've heard people got to over 6Gbps at least), and I wonder if it has something to do with vhost-net maxing out on CPU. If so, is there anything I can tune the system?
You could dedicate network card to your virtual machine, using PCI passthrough.
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