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DOC: mention the maxconn limitations with the select poller

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Select()'s safe area is limited to 1024 FDs, and anything higher
than this will report "select: FAILED" on startup in debug mode,
so better document it.
This commit is contained in:
Willy Tarreau 2014-06-19 15:31:25 +02:00
parent 869f351d0f
commit 8274e105b7
1 changed files with 5 additions and 1 deletions
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6
doc/configuration.txt
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@ -739,7 +739,11 @@ maxconn <number>
Sets the maximum per-process number of concurrent connections to <number>. It Sets the maximum per-process number of concurrent connections to <number>. It
is equivalent to the command-line argument "-n". Proxies will stop accepting is equivalent to the command-line argument "-n". Proxies will stop accepting
connections when this limit is reached. The "ulimit-n" parameter is connections when this limit is reached. The "ulimit-n" parameter is
automatically adjusted according to this value. See also "ulimit-n". automatically adjusted according to this value. See also "ulimit-n". Note:
the "select" poller cannot reliably use more than 1024 file descriptors on
some platforms. If your platform only supports select and reports "select
FAILED" on startup, you need to reduce maxconn until it works (slightly
below 500 in general).
maxconnrate <number> maxconnrate <number>
Sets the maximum per-process number of connections per second to <number>. Sets the maximum per-process number of connections per second to <number>.