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Name
Size
Permission
Date
Action
bashreadline_example.txt
722
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biolatency_example.txt
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biosnoop_example.txt
2.01
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biostacks_example.txt
1.87
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bitesize_example.txt
2.93
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capable_example.txt
2.6
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cpuwalk_example.txt
4.8
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dcsnoop_example.txt
4.5
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execsnoop_example.txt
1.5
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gethostlatency_example.txt
923
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killsnoop_example.txt
846
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loads_example.txt
864
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mdflush_example.txt
1.82
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naptime_example.txt
844
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oomkill_example.txt
1.63
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opensnoop_example.txt
2.47
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pidpersec_example.txt
1.47
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runqlat_example.txt
8.43
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runqlen_example.txt
980
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setuids_example.txt
2.38
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ssllatency_example.txt
4.4
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sslsnoop_example.txt
1.87
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statsnoop_example.txt
2.67
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swapin_example.txt
549
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syncsnoop_example.txt
541
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syscount_example.txt
1.12
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tcpaccept_example.txt
1.32
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tcpconnect_example.txt
1.06
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tcpdrop_example.txt
1.23
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tcplife_example.txt
1.56
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tcpretrans_example.txt
1.13
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tcpsynbl_example.txt
940
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threadsnoop_example.txt
1.15
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undump_example.txt
680
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vfscount_example.txt
1.17
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vfsstat_example.txt
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writeback_example.txt
1.92
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xfsdist_example.txt
3.34
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Demonstrations of tcpretrans, the Linux bpftrace/eBPF version. This tool traces the kernel TCP retransmit function to show details of these retransmits. For example: # ./tcpretrans.bt TIME PID LADDR:LPORT RADDR:RPORT STATE 01:55:05 0 10.153.223.157:22 69.53.245.40:34619 ESTABLISHED 01:55:05 0 10.153.223.157:22 69.53.245.40:34619 ESTABLISHED 01:55:17 0 10.153.223.157:22 69.53.245.40:22957 ESTABLISHED [...] This output shows three TCP retransmits, the first two were for an IPv4 connection from 10.153.223.157 port 22 to 69.53.245.40 port 34619. The TCP state was "ESTABLISHED" at the time of the retransmit. The on-CPU PID at the time of the retransmit is printed, in this case 0 (the kernel, which will be the case most of the time). Retransmits are usually a sign of poor network health, and this tool is useful for their investigation. Unlike using tcpdump, this tool has very low overhead, as it only traces the retransmit function. It also prints additional kernel details: the state of the TCP session at the time of the retransmit. USAGE message: # ./tcpretrans.bt