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Limit req: improved handling of negative times. Negative times can appear since workers only update time on an event loop iteration start. If a worker was blocked for a long time during an event loop iteration, it is possible that another worker already updated the time stored in the node. As such, time since last update of the node (ms) will be negative. Previous code used ngx_abs(ms) in the calculations. That is, negative times were effectively treated as positive ones. As a result, it was not possible to maintain high request rates, where the same node can be updated multiple times from during an event loop iteration. In particular, this affected setups with many SSL handshakes, see http://mailman.nginx.org/pipermail/nginx/2018-May/056291.html. Fix is to only update the last update time stored in the node if the new time is larger than previously stored one. If a future time is stored in the node, we preserve this time as is. To prevent breaking things on platforms without monotonic time available if system time is updated backwards, a safety limit of 60 seconds is used. If the time stored in the node is more than 60 seconds in the future, we assume that the time was changed backwards and update lr->last to the current time.
author Maxim Dounin <mdounin@mdounin.ru>
date Wed, 30 May 2018 15:40:34 +0300
parents 400711951595
children
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charset_map  koi8-r  windows-1251 {

    80  88 ; # euro

    95  95 ; # bullet

    9A  A0 ; # &nbsp;

    9E  B7 ; # &middot;

    A3  B8 ; # small yo
    A4  BA ; # small Ukrainian ye

    A6  B3 ; # small Ukrainian i
    A7  BF ; # small Ukrainian yi

    AD  B4 ; # small Ukrainian soft g
    AE  A2 ; # small Byelorussian short u

    B0  B0 ; # &deg;

    B3  A8 ; # capital YO
    B4  AA ; # capital Ukrainian YE

    B6  B2 ; # capital Ukrainian I
    B7  AF ; # capital Ukrainian YI

    B9  B9 ; # numero sign

    BD  A5 ; # capital Ukrainian soft G
    BE  A1 ; # capital Byelorussian short U

    BF  A9 ; # (C)

    C0  FE ; # small yu
    C1  E0 ; # small a
    C2  E1 ; # small b
    C3  F6 ; # small ts
    C4  E4 ; # small d
    C5  E5 ; # small ye
    C6  F4 ; # small f
    C7  E3 ; # small g
    C8  F5 ; # small kh
    C9  E8 ; # small i
    CA  E9 ; # small j
    CB  EA ; # small k
    CC  EB ; # small l
    CD  EC ; # small m
    CE  ED ; # small n
    CF  EE ; # small o

    D0  EF ; # small p
    D1  FF ; # small ya
    D2  F0 ; # small r
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    D4  F2 ; # small t
    D5  F3 ; # small u
    D6  E6 ; # small zh
    D7  E2 ; # small v
    D8  FC ; # small soft sign
    D9  FB ; # small y
    DA  E7 ; # small z
    DB  F8 ; # small sh
    DC  FD ; # small e
    DD  F9 ; # small shch
    DE  F7 ; # small ch
    DF  FA ; # small hard sign

    E0  DE ; # capital YU
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    F0  CF ; # capital P
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    F7  C2 ; # capital V
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    FB  D8 ; # capital SH
    FC  DD ; # capital E
    FD  D9 ; # capital SHCH
    FE  D7 ; # capital CH
    FF  DA ; # capital hard sign
}