Commits on Aug 19, 2024

1. conf, router: Make the listen(2) backlog configurable …

   @oopsoop2 on GitHub reported a performance issue related to the default
   listen(2) backlog size of 511 on nginx. They found that increasing it
   helped, nginx has a config option to configure this.
   
   They would like to be able to do the same on Unit (which also defaults
   to 511 on some systems). This seems reasonable.
   
   NOTE: On Linux before commit 97c15fa ("socket: Use a default listen
   backlog of -1 on Linux") we defaulted to 511. Since that commit we
   default to the Kernels default, which before 5.4 is 128 and after is
   4096.
   
   This adds a new per-listener 'backlog' config option, e.g
   
     {
         "listeners": {
             "[::1]:8080": {
                 "pass": "routes",
                 "backlog": 1024
             },
         }
   
         ...
     }
   
   This doesn't effect the control socket.
   
   Closes: nginx#1384
   Reported-by: <https://github.com/oopsoop2>
   Signed-off-by: Andrew Clayton <[email protected]>

   

   ac000 committed Aug 19, 2024
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