You should be able to do some tethereal + perl magic to do that. Something similar is already available in ethereal if you just want to verify that bulk tcp transfers are behaving properly:
The 5 second method to verify if the tcp layer is a-ok or not for optimal throughput for bulk transfers: ================================================== Select one packet in the direction of the tcp bulk transfer performane analysis. Select Tools/TCP Stream Analysis Apply eyeball to graph: * If after zooming in looks like a straight line from bottom left to top right corner everything is a-ok on the tcp layer. * If you get a staircase where the height of each step is approximately the same height you have a problem with tcp window size being too small. The width of each step should only vary a little and is the RTT for the flow. This effect is caused by having the tcp window smaller than what can be transmitted end-to-end during one RTT and this small tcp window size is capping throughput. Increase the tcp window size to compensate for the end to end latency. * If you get a staircase with different heights of the steps and also widely varying lengths of the steps, with some steps being very long/wide. Then what you see is normal (i.e. non-fast) tcp retransmissions which kills your performance. Ivestigate what is causing the congestion/packet-loss and reduce it and performance will be enhanced. This often means that the tcp window size is too high and that this causes bursts that will overflow a buffer somewhere. ----- Original Message ----- From: victor.lee Sent: Tuesday, April 01, 2003 12:12 AM Subject: [Ethereal-users] TCP performance measurment in csv format Hi, I would like to know if there is a good method to calculate the end-to-end TCP throughput against time and converted the result into a csv file in other for further Excel post-processing. Cheers, Victor Lee _______________________________________________ Ethereal-users mailing list [EMAIL PROTECTED] http://www.ethereal.com/mailman/listinfo/ethereal-users
