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I've been using freevps' bench.sh to test dl speed, but what's an easy way to test upload speed on a Linux VPS? I've been using DSLreports for Windows.
What do you mean? You simply download something from your server.
Install a web server and give us a test file link and we'll download it and tell you the results.
This is good, thanks a lot!
Speedtest-cli isn't good to test your VPS upload speed. It's just horrible.
iperf is your friend. If you can't setup your own iperf server, google around and try some public ones: