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Demonstrations of tcpsynbl, the Linux bpftrace/eBPF version. This tool shows the TCP SYN backlog size during SYN arrival as a histogram. This lets you see how close your applications are to hitting the backlog limit and dropping SYNs (causing performance issues with SYN retransmits). For example: # ./tcpsynbl.bt Attaching 4 probes... Tracing SYN backlog size. Ctrl-C to end. ^C @backlog[backlog limit]: histogram of backlog size @backlog[500]: [0] 2266 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@| [1] 3 | | [2, 4) 1 | | This output shows that for the backlog limit of 500, there were 2266 SYN arrivals where the backlog was zero, three where the backlog was one, and one where the backlog was either two or three. This indicates that we are nowhere near this limit.