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Re: [Xen-devel] Significant network performance difference when different NIC MQ handles the packet





On 31/12/14 09:06, Zhangleiqiang (Trump) wrote:
Hi, all:

        I have used pkt-gen to send udp packet (1400 bytes) from one Dom0 A to another Dom0 B each of which is connected by 
10GE network. On the receive side (B),different "ksoftirqd/x" processes will handle the packet during each 
testing because the nic has multiple queues. I find that if "ksoftirqd/0" handles the packet, the throughout can 
reach to about 7Gbps. However, when "ksoftirqd/2" handles the packet, the throughout can only reach to about 2Gbps, 
and for "ksoftirqd/3", the throughout can even as low as 1Gbps.

        I am wondering what the reason it is. Could anyone give me some hint 
about it ?
NUMA topology? Your card might use memory "close" to CPU core 0, but not to the others?

Zoltan


----------
zhangleiqiang (Trump)

Best Regards


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