what version of iperf did you use? iperf -v should provide that.
If it's a later version of iperf2 the output on the client of with the -e
option could be helpful.
Bob
On Thu, May 3, 2018 at 8:34 PM, Nikita Gupta <nikitar...@gmail.com> wrote:
> Hi Bruce thanks for giving time on this issue.
>
> I am working on an embedded system with imx50.
> Server i'm using is RaspberryPi. Both the machines are connected on same
> network.
>
> Yes the system is a bit loaded. So this might be the reason.
> But if I reduce the window size then bandwidth also reduces and the time
> interval issue disappears.
>
> But with bandwidth of ~45M (which is the max it is showing) then it starts
> giving time interval issues.
>
> One more thing, I tried with iperf as well and its not giving any such
> issues on same machine with same server.
>
> On Thu, May 3, 2018 at 11:49 PM, Bruce A. Mah <b...@es.net> wrote:
>
>> 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.
>>
>>
>>
>>
>>
>
>
> --
> Regards,
> Nikita Gupta
>
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