Yes, iperf2 giving correct result. But can you explain why *iperf3* is not
showing data of 1 Sec but of 1.24 sec?
On Tue, 8 May 2018 at 10:37 AM, Bob McMahon <bob.mcma...@broadcom.com>
wrote:
> 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
>>>>>>
>>>>>>
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>>>>>>
>>>>>>
>>>>>
>>>>
>>>>
>>>> --
>>>> Regards,
>>>> Nikita Gupta
>>>>
>>>
>>>
>>
>>
>> --
>> Regards,
>> Nikita Gupta
>>
>
> --
Regards,
Nikita Gupta
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