Hello, I'm trying to determine the throughput of a flow at each switch in a network. Currently I'm just playing with dpctl to try and get this information. Right now I'm sending a 10Mbit/sec udp stream into one of my switches. When I dump the flow out I get the following output:
cookie=0, duration_sec=364s, duration_nsec=586000000s, table_id=0, priority=65535, n_packets=307696, n_bytes=84672, idle_timeout=5,hard_timeout=0,udp,in_port=39,dl_vlan=0xffff,dl_vlan_pcp=0x00,dl_src=00:1b:21:75:7a:92,dl_dst=00:1b:21:5a:e6:a9,nw_src=10.42.15.104,nw_dst=10.42.15.55,nw_tos=0x00,tp_src=51661,tp_dst=5001,actions=output:43 >From this I would expect the throughput to be ((84672*8)/(1000000))/364. Though this is not correct. It seems the n_bytes counter is incorrect and does not update along side with the n_packets counter. The n_packets counter seems to be correct though (307696*1470*8)/(1000000)/364 = ~9.94Mbit/sec (Note where 1470 is the mtu). Is there another method for getting this information? In my application I'm sure I'm not going to be always transmitting at the MTU value. Thanks, Aaron P.S: The switch I'm using is a HP procurve with the latest OF firmware. -- Aaron O. Rosen Masters Student - Network Communication 306B Fluor Daniel
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