Whilst troubleshooting a couple of servers whose network throughput was poor, I found some good write ups of tuning Linux for TCP throughput that helped to figure out that the receive buffers had been tweaked to values that hampered performance. Often it's not the network that is at fault for poor performance & some deep diving is required to identify the root cause.
https://hpbn.co/building-blocks-of-tcp/
https://blog.cloudflare.com/optimizing-tcp-for-high-throughput-and-low-latency/
https://blog.cloudflare.com/when-the-window-is-not-fully-open-your-tcp-stack-is-doing-more-than-you-think/
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