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[2] "Configuring and tuning HPE ProLiant Servers for low-latency applications": https://www.hpe.com/h20195/v2/GetPDF.aspx/c05281307.pdf

[3] https://downloads.linux.hpe.com/SDR/project/stk/

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A fast way to tell if the computation bottleneck is on the server side: search for "start of polling iteration X, last poll was Y ns ago" in the time trace to see if there is constantly empty polling iterations; if so, the client is probably the bottleneck and you can check the client's time trace in the same way.