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List:       xen-devel
Subject:    [Xen-devel] Significant network performance difference when different NIC MQ handles the packet
From:       "Zhangleiqiang (Trump)" <zhangleiqiang () huawei ! com>
Date:       2014-12-31 9:06:40
Message-ID: 3A6795EA1206904E94BEC8EF9DF109AE23955DC4 () SZXEMA512-MBX ! china ! huawei ! com
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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 ?

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

Best Regards


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