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Changes between Version 55 and Version 56 of jazz/Performance_Tuning


Ignore:
Timestamp:
Jan 6, 2017, 11:16:06 AM (8 years ago)
Author:
jazz
Comment:

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  • jazz/Performance_Tuning

    v55 v56  
    380380}}}
    381381
     382 * 有時候不見得有安裝 net-tools 套件，沒有 netstat 指令，有沒有辦法透過 procfs 去排查是否有太多 TIME_WAIT 呢？
     383   * 若單純看 TIME_WAIT 的話，可以觀察 /proc/slabinfo
     384{{{
     385cat /proc/slabinfo  | grep tw_sock
     386}}}
     387   * 另一個方式是觀察 /proc/net/tcp 與 /proc/net/tcp6 的 st 欄位
     388{{{
     389$ cat /proc/net/tcp | awk '{ print $4 }' | sort | uniq -c
     390      3 01
     391     14 06
     392      5 0A
     393      1 st
     394}}}
     395   * 對應的數值可於 [http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/include/net/tcp_states.h tcp_states.h] 查到
     396{{{
     397        TCPF_ESTABLISHED = (1 << 1),
     398        TCPF_SYN_SENT    = (1 << 2),
     399        TCPF_SYN_RECV    = (1 << 3),
     400        TCPF_FIN_WAIT1   = (1 << 4),
     401        TCPF_FIN_WAIT2   = (1 << 5),
     402        TCPF_TIME_WAIT   = (1 << 6),
     403        TCPF_CLOSE       = (1 << 7),
     404        TCPF_CLOSE_WAIT  = (1 << 8),
     405        TCPF_LAST_ACK    = (1 << 9),
     406        TCPF_LISTEN      = (1 << 10),
     407        TCPF_CLOSING     = (1 << 11),
     408        TCPF_NEW_SYN_RECV = (1 << 12),
     409}}}
     410
    382411== Power Management ==
    383412