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

[Zoltan Kiss <zoltan.kiss@xxxxxxxxxx>]

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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