From 4ae3f3e34c13f4df8540f5bce3a002c5c2226f80 Mon Sep 17 00:00:00 2001 From: Eric Wong Date: Wed, 15 Jul 2015 21:20:35 +0000 Subject: configurator: document net.core.somaxconn sysctl dependency Linux users are effectively capped to 128 on stock installations and may wonder why connections get rejected with overloaded apps sooner rather than later. --- lib/unicorn/configurator.rb | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/lib/unicorn/configurator.rb b/lib/unicorn/configurator.rb index 32e49c1..02f6b6b 100644 --- a/lib/unicorn/configurator.rb +++ b/lib/unicorn/configurator.rb @@ -254,6 +254,11 @@ class Unicorn::Configurator # # Default: 1024 # + # Note: with the Linux kernel, the net.core.somaxconn sysctl defaults + # to 128, capping this value to 128. Raising the sysctl allows a + # larger backlog (which may not be desirable with multiple, + # load-balanced machines). + # # [:rcvbuf => bytes, :sndbuf => bytes] # # Maximum receive and send buffer sizes (in bytes) of sockets. -- cgit v1.2.3-24-ge0c7