Wow, #OVHCloud's customer support is really bad. They don't read the diagnostics that you've already done, they ask you to run tests that would give them no information (you've run iperf3 and it's fast with any remote client. Two other protocols are slow, but only over one ingress path. Please reboot into rescue mode and run iperf3. We don't know what information that will give us, but it's the next thing on the script and we have no actual brains and must follow the script). Oh, and they disappear for a week in the middle rather than responding to questions like 'what do you actually hope to learn from this test, do you have a hypothesis that would be either supported or contradicted by it?'
I definitely will not use them for anything important. I have a server with them that I was planning on moving things over to but I'm not even sure I want to trust them for personal stuff anymore, given that they are obviously completely clueless.
I guess the fact that their Kimsufi servers are so cheap (4x2TB disks in a machine for about £20/month) should have been a clue that they cut corners everywhere. I assumed it was just that the machines had already fully depreciated.
Are there any less-incompetent providers that offer cheapish (old is fine) machines with decent sized disks?