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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
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biostacks_example.txt
1.87
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bitesize_example.txt
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capable_example.txt
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cpuwalk_example.txt
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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
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naptime_example.txt
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oomkill_example.txt
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opensnoop_example.txt
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pidpersec_example.txt
1.47
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runqlat_example.txt
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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
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tcpaccept_example.txt
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tcpconnect_example.txt
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tcpdrop_example.txt
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tcplife_example.txt
1.56
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tcpretrans_example.txt
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tcpsynbl_example.txt
940
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threadsnoop_example.txt
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undump_example.txt
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vfscount_example.txt
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vfsstat_example.txt
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writeback_example.txt
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xfsdist_example.txt
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Demonstrations of tcpdrop, the Linux bpftrace/eBPF version. tcpdrop prints details of TCP packets or segments that were dropped by the kernel, including the kernel stack trace that led to the drop: # ./tcpdrop.bt TIME PID COMM SADDR:SPORT DADDR:DPORT STATE 00:39:21 0 swapper/2 10.231.244.31:3306 10.229.20.82:50552 ESTABLISHE tcp_drop+0x1 tcp_v4_do_rcv+0x135 tcp_v4_rcv+0x9c7 ip_local_deliver_finish+0x62 ip_local_deliver+0x6f ip_rcv_finish+0x129 ip_rcv+0x28f __netif_receive_skb_core+0x432 __netif_receive_skb+0x18 netif_receive_skb_internal+0x37 napi_gro_receive+0xc5 ena_clean_rx_irq+0x3c3 ena_io_poll+0x33f net_rx_action+0x140 __softirqentry_text_start+0xdf irq_exit+0xb6 do_IRQ+0x82 ret_from_intr+0x0 native_safe_halt+0x6 default_idle+0x20 arch_cpu_idle+0x15 default_idle_call+0x23 do_idle+0x17f cpu_startup_entry+0x73 rest_init+0xae start_kernel+0x4dc x86_64_start_reservations+0x24 x86_64_start_kernel+0x74 secondary_startup_64+0xa5 [...] The last column shows the state of the TCP session. This tool is useful for debugging high rates of drops, which can cause the remote end to do timer-based retransmits, hurting performance. USAGE: # ./tcpdrop.bt