iperf2 seems to be indicating 83 socket writes per second with no write
errors. The congestion window is 42K and the RTT is 3.5 milliseconds.
Nothing seems too unusual to me.
Bob
On Mon, May 7, 2018 at 8:05 PM, Nikita Gupta <nikitar...@gmail.com> wrote:
> Yeah Bob,
>
> Input command for iperf 2.0.10:
> iperf -c <server addr> -e -i 1 -t 10
> Output for iperf 2.0.10:
> [ 3] 0.00-1.00 sec 10.4 MBytes 87.0 Mbits/sec 83/0 0
> 42K/3464 us
>
> input for iperf3:
> iperf3 -c <server addr> -i 1 -t 10
> Output for iperf3:
> [ 5] 0.00-1.24 sec 5.60 MBytes 37.7 Mbits/sec 0 38.2 KBytes
>
> I'm facing issue of time interval with iperf3.
>
> On Mon, May 7, 2018 at 9:10 PM, Bob McMahon <bob.mcma...@broadcom.com>
> wrote:
>
>> The client output for 2.0.10 with -e and -i 1 could provide useful
>> information.
>>
>> Bob
>>
>> On Mon, May 7, 2018 at 1:32 AM, Nikita Gupta <nikitar...@gmail.com>
>> wrote:
>>
>>> Hi Bob,
>>>
>>> Working without issue: iperf-2.0.10
>>> Time interval issue: iperf-3.3, iperf-3.1, iperf-3.5, iperf-3.0
>>>
>>> Regards,
>>> Nikita
>>>
>>> On Sat, May 5, 2018 at 3:37 AM, Bob McMahon <bob.mcma...@broadcom.com>
>>> wrote:
>>>
>>>> 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
>>>>>
>>>>> ------------------------------------------------------------
>>>>> ------------------
>>>>> Check out the vibrant tech community on one of the world's most
>>>>> engaging tech sites, Slashdot.org! http://sdm.link/slashdot
>>>>> _______________________________________________
>>>>> Iperf-users mailing list
>>>>> Iperf-users@lists.sourceforge.net
>>>>> https://lists.sourceforge.net/lists/listinfo/iperf-users
>>>>>
>>>>>
>>>>
>>>
>>>
>>> --
>>> Regards,
>>> Nikita Gupta
>>>
>>
>>
>
>
> --
> Regards,
> Nikita Gupta
>
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