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Here is how to download and run iper3 on Windows and how to test single and multi-thread upload and download speeds. - This uses the Andrews & Arnold speed test server, which is only available to customers.
Here is how to download and run iper3 on Windows and how to test single and multi-thread upload and download speeds. - This uses the Andrews & Arnold speed test server, which is only available to customers.


The version of iperf3 we have here is 3.13 from June 2023 - and is newer than the version that is hosted on the official iperf.fr website and so has a lot of bug fixes. - thanks to ''Mini'' for compiling this.
The version of iperf3 we have here is 3.13 from Github built with cygwin. It's a newer version that is hosted on the iperf.fr website and so has a lot of bug fixes. - Thanks to ''Thomas Jepp'' for compiling this.


===1) Download...===
===1) Download...===
Download '''[[Media:Iperf-3.13-windows-x64.zip]]''' and save it to your computer, eg in your Downloads folder.
Download '''[[Media:Iperf-3.13-windows-x64.zip]]''' and save it to your computer, eg in your Downloads folder. (The usual caveats apply when downloading files from untrusted sources...)


<gallery widths=600 heights=300>
<gallery widths=600 heights=300>
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===4) Find the files...===
===4) Find the files...===
In the black box type: '''<SyntaxHighlight inline>cd Downloads\iperf-3.13-windows-x64 </SyntaxHighlight>'''
In the black box type: '''<SyntaxHighlight inline>cd Downloads\Iperf-3.13-windows-x64\iperf-3.13-windows-x64 </SyntaxHighlight>'''

You can check if you're in the right place by typing '''<SyntaxHighlight inline>dir</SyntaxHighlight>''' and you should see some files including '''<SyntaxHighlight inline>iperf3.exe</SyntaxHighlight>''' listed.


<gallery widths=600 heights=300>
<gallery widths=600 heights=300>
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===5) Run iperf3 ===
===5) Run iperf3 ===
Run an speed test by typing: '''<SyntaxHighlight inline>iperf3.exe -c speedtest.aa.net.uk</SyntaxHighlight>''' (you may need to click 'allow access' if a Windows Defender window pops up
Test it by running a simple speed test by typing: '''<SyntaxHighlight inline>iperf3.exe -c speedtest.aa.net.uk</SyntaxHighlight>''' (you may need to click 'allow access' if a Windows Defender window pops up.


By default, this will run a single-thread upload speedtest (sending traffic TO the speed test server). As you can see in the screenshot, the upload speed this line happens to get is just over 19Mb/s.
By default, this will run a single-thread upload speedtest (sending traffic TO the speed test server). As you can see in the screenshot, the upload speed this line happens to get is just over 19Mb/s.

There are various other useful tests you can run, see the variations below.


<gallery widths=600 heights=300>
<gallery widths=600 heights=300>
Windows_iperf_4_results.JPG
Windows_iperf_4_results.JPG
</gallery>
</gallery>

===6) Send us the results===
You can copy all the text in the Command Prompt and email it over to us: Pressing '''<SyntaxHighlight inline>Ctrl-A</SyntaxHighlight>''' (The Control Key and the A key) will select all the text, and '''<SyntaxHighlight inline>Ctrl-C</SyntaxHighlight>''' will copy it to the clipboard. You can then open up your email and paste it in to the message.


=Variations=
=Variations=


There are variations you can do to test the speed as follows by using the '''-R''' (reverse) and '''-P''' Parallel options:
There are variations you can do to test the speed as follows by using the '''-R''' (reverse) and '''-P''' Parallel options, we've also included a timestamp and a title to help with the logging:


* Run a '''single-thread Download''' test: <SyntaxHighlight inline>iperf3.exe -R -P1 -c speedtest.aa.net.uk</SyntaxHighlight>
* Run a '''single-thread Download''' test: <SyntaxHighlight inline>iperf3.exe --timestamps -T "1xDOWN" -R -P1 -c speedtest.aa.net.uk</SyntaxHighlight>
* Run a '''single-thread Upload''' test: <SyntaxHighlight inline>iperf3.exe -P1 -c speedtest.aa.net.uk</SyntaxHighlight>
* Run a '''single-thread Upload''' test: <SyntaxHighlight inline>iperf3.exe --timestamps -T "1xUP" -P1 -c speedtest.aa.net.uk</SyntaxHighlight>
* Run a '''10-thread Download''' test: <SyntaxHighlight inline>iperf3.exe -R -P10 -c speedtest.aa.net.uk</SyntaxHighlight>
* Run a '''10-thread Download''' test: <SyntaxHighlight inline>iperf3.exe --timestamps -T "10xDOWN" -R -P10 -c speedtest.aa.net.uk</SyntaxHighlight>
* Run a '''10-thread Upload''' test: <SyntaxHighlight inline>iperf3.exe -P10 -c speedtest.aa.net.uk</SyntaxHighlight>
* Run a '''10-thread Upload''' test: <SyntaxHighlight inline>iperf3.exe --timestamps -T "10xUP" -P10 -c speedtest.aa.net.uk</SyntaxHighlight>


===What to look for:===
===What to look for:===
* The results should be near to the speed you'd expect for your line.
* The results should be near to the speed you'd expect for your line.
* You may want to run the tests at different times of day so as to see if there is any peak-time congestio0n affecting you.
* You may want to run the tests at different times of day so as to see if there is any peak-time congestion affecting you.
* Hopefully the single and multi-thread tests give similar results - if not, there may be some sort of problem.
* Hopefully the single and multi-thread tests give similar results - if not, there may be some sort of problem.
Retrieved from "http://support.aa.net.uk/Windows_iperf3"