network timestamping

从网络的角度分析时间

Tracing 1 functions for "__sock_tx_timestamp"... Hit Ctrl-C to end.
^C
  b'__sock_tx_timestamp'
  b'ip_make_skb'
  b'udp_sendmsg'
  b'inet_sendmsg'
  b'sock_sendmsg'
  b'____sys_sendmsg'
  b'___sys_sendmsg'
  b'__sys_sendmsg'
  b'__arm64_sys_sendmsg'
  b'el0_svc_common'
  b'el0_svc_handler'
  b'el0_svc'

chronyd 的时间:

Jun 20 15:48:33 node1960 chronyd[5856]: Enabled HW timestamping on enp129s0f0np0
Jun 20 15:48:33 node1960 chronyd[5856]: Enabled HW timestamping on enp129s0f1np1
Jun 20 15:48:33 node1960 chronyd[5856]: Enabled HW timestamping on enp130s0f0np0
Jun 20 15:48:33 node1960 chronyd[5856]: Enabled HW timestamping on enp130s0f1np1

具体细节分析 : Documentation/networking/timestamping.txt

• ip_append_data
• ip_make_skb
  • ip_setup_cork
    • sock_tx_timestamp
• tcp_sendmsg_locked -> tcp_tx_timestamp
  • sock_tx_timestamp
• sock_tx_timestamp
• skb_setup_tx_timestamp : raw 和 af 使用
  • _sock_tx_timestamp

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