I have a typical long fat network -- clients connect to servers with large bandwidth but also significant latency due to geographic distances of 30ms to 100ms, transferring large files.
I've noticed the classic decay of throughput ~ which decays as 1 / latency. Typical throughputs based on tests are well below the theoretical bandwidths of clients and servers and follow this decay rule.
My file transfer tests seem to be consistent with a tcp windows size of 64KB, suggesting that scaling is not enabled.
My servers are all running Ubuntu 1804.
How do I view and tweak the tcp window size settings on my Ubuntu 1804 servers? I could not find this info in previous answers.