jsommers / fs Goto Github PK

Hi,I am using your simulation tools.But I can't understand the format of the flow export files.For example,what's the meaning of each column of the following line?
textexport a 0.016469 0.016469 0.321625 10.1.0.1:22->10.3.1.1:25833 tcp 0x0 harpoon:172.16.0.1 5 4373 FSA
I am looking forward to your reply as soon as possible.

I noticed something interesting about the counters when playing with fs-sdn when executing that simpler version of openflow_small_cbr.dot.

It uses the learning switch application and sends traffic from switch A that goes through B and ends in C. Every interfaces can forward 10Mpbs.
The udp traffic starts at 5s and an additional flow of 10Mb is sent every second.

The interesting thing is that in the A counters I can see the flows leaving every seconds, but the first flow only reaches B at 7s and C at 8s. In a scenario without congestion and no queue delay, or competing flows, at 10Mbps, the time to reach should not be near 6s? (Approximately the time it takes to be transmitted to switch A, considering that the next switch starts to transmit as soon as the first packet reaches it).

A counters
5.000 simple->a 1250000 bytes 826 pkts 1 flows
7.000 simple->a 1250000 bytes 826 pkts 1 flows
8.000 simple->a 1250000 bytes 826 pkts 1 flows

B counters
7.000 a->b 1250000 bytes 826 pkts 1 flows
9.000 a->b 1250000 bytes 826 pkts 1 flows

C counters
8.000 b->c 1250000 bytes 826 pkts 1 flows
10.000 b->c 1250000 bytes 826 pkts 1 flows

Looking in the code

wait = self.delay + flowlet.size / self.capacity

The waiting time is calculated that way, which means for the flow size sent, the wait is going to be 1s, which explains the difference in the interval between different switches. Is it a known problem or is it related to the way traffic is being generated? (Considering the importance of the traffic generator to it).