If memory serves me right, Nikita Gupta wrote: > Hi team, > > While checking network performance using iperf3, I'm facing interval > issue at client end. Below are the logs: > > [ 5] 0.00-1.05 sec 11.2 MBytes 88.7 Mbits/sec 0 42.4 > KBytes > [ 5] 1.05-2.01 sec 10.0 MBytes 88.2 Mbits/sec 0 42.4 > KBytes > [ 5] 2.01-3.07 sec 11.2 MBytes 88.4 Mbits/sec 0 42.4 > KBytes > [ 5] 3.07-4.05 sec 10.3 MBytes 88.5 Mbits/sec 0 42.4 > KBytes > [ 5] 4.05-5.11 sec 11.2 MBytes 88.6 Mbits/sec 0 42.4 > KBytes > [ 5] 5.11-6.06 sec 10.0 MBytes 88.7 Mbits/sec 0 42.4 > KBytes > [ 5] 6.06-7.07 sec 10.7 MBytes 89.0 Mbits/sec 0 42.4 > KBytes > [ 5] 7.07-8.02 sec 10.0 MBytes 88.6 Mbits/sec 0 66.5 > KBytes > [ 5] 8.02-9.09 sec 11.1 MBytes 86.8 Mbits/sec 0 112 > KBytes > [ 5] 9.09-10.06 sec 10.0 MBytes 85.7 Mbits/sec 0 112 > KBytes > - - - - - - - - - - - - - - - - - - - - - - - - - > [ ID] Interval Transfer Bitrate Retr > [ 5] 0.00-10.06 sec 106 MBytes 88.1 Mbits/sec 0 sender > [ 5] 0.00-10.12 sec 106 MBytes 87.6 Mbits/sec > receiver > > I checked github bug #125 which was addressing this specific issue. But > no help. > I have tried iperf3.0.5, iperf3.1, iperf3.3, iperf3.5. In all versions, > I'm getting the same issue. > > P.S. Server(with same iperf3 version) provides result as expected with 1 > sec time interval, but client provides data at different time intervals > in every iteration. > Kindly look into the issue and do let me know if m missing something.
What are the command line arguments you are using (both client and server side, sanitize them as necessary0? Also could you say something about the environment you're running in? In particular, what OS and hardware on the client and server, and what kind of network path are you going over? I rarely see issues like this (where the statistics printing intervals are not aligned to whole second boundaries) in the middle of a test, although it's been known to happen at the end of a test, for conditions that only happen at the end of a test. It seems like the timers within iperf3 that control when statistics and computed and printed aren't firing when they're supposed to. On my laptop (MacBook Pro) this happens close enough to the correct time that the timestamps appear to be exactly aligned to whole second boundaries (they're not, but close enough given the precision of printing the values in the output). This situation could happen on slow hardware (some kind of embedded system?), on a virtual machine, or on a system that is very heavily loaded. We would need some more information to determine which of this is the case (or whether it's something completely different). Bruce.
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