perfsonar development work

["Nemanja Zutic" <>]

Hi Nicolas,

 

Changes have been made to the BWCTL tab as proposed by point 1. of the PerfsonarUI - New Features page. For now, user can enter RTT manually or he can call for 2 ippm requests to be performed to retrieve the last known one way delay in each direction. Nina told us that the bwctl service and ippm service run on diferent machines so that this measurement may not be accurate. Often the calculated maximum BW is less than the measured BW. Is it possible that BWCTL returns the BW value on the physical layer while we are calculating the max BW on the transport layer or is the RTT measurement at fault? The formula we use is maxBW=(windowsize*8)/rtt where windowsize is in bytes and rtt in seconds.

 

Best regards,

Nemanja Zutic

Universitiy of Belgrade Computing Center