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[[Category:ADSL Faults]]
If you're needing to speed-test your internet service then you can use web-based speed testers such as https://speedtest.aa.net.uk, but they may not always give you accurate results. An alternative is using a tool called iperf3 to run a speed test against an iperf3 server that is hosted at your ISP.
Here is how to download and run iper3 on Windows and how to test single and multi-thread upload and download speeds.▼
iperf3 is a program that is easily installed on many Linux distributions, but is a little harder to use on Windows.
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.▼
▲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.
Download '''[[File:Iperf-3.13-windows-x64.zip]]''' and save it to your computer, eg in your Downloads folder.▼
▲The version of iperf3 we have here is 3.13 from
===1) Download...===
▲Download '''[[
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===2) Extract... ===
Right click on it, and select '''Extract all'''.
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===3) Open Command Prompt...===
Open up the Command Prompt - Click '''<SyntaxHighlight inline>Start
===4) Find the files...===
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.
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===5) Run iperf3 ===
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.
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===6) Send us the results===
▲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.
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.
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 --timestamps -T "1xDOWN" -R -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 --timestamps -T "10xDOWN" -R -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:===
* 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
* Hopefully the single and multi-thread tests give similar results - if not, there may be some sort of problem.
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