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Did you try higher values, ie 4? What is the output of this command? cat /proc/sys/net/ipv4/tcp_rmem What kind of latency do you see between these hosts? Do you have a packet capture available (including TCP handshake)?

That's true, but now I'm limited by my ISP's policing instead of suboptimal TCP throughput. My upload is limited to 40Mpbs, and I get sustained tranfer rates that are >95% of that limit. Interfaces │ RX bps pps %│ TX bps pps % >wg2110...

I can confirm the issue, and the mitigation. I have an upstream bandwidth limit of 40Mbps. Direct connection to PBS: ~$ proxmox-backup-client benchmark --repository 10.X.Y.9:filestore Uploaded 10 chunks in 18 seconds. Time per request: 1861884 microseconds. TLS speed: 2.25 MB/s Connection...