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systemd,manual: set LimitNOFILE=65536 

A typical OS imposed limit is 1024 open FD, which can bee too low when
there are hundreds of concurrent voice calls.

In systemd service file, set a super high limit of 65536.

In osmo-mgw's user manual, add section 'Configure limits' describing
this in detail.

Related: OS#6256
Related: osmo-bsc I26c4058484b11ff1d035a919bf88824c3af14e71
Change-Id: I46512517bc3b5bb90cac7643e7ac73afba398d36
This commit is contained in:
Neels Hofmeyr 2023-11-30 18:20:51 +01:00 committed by laforge
parent 249d21eb1e
commit cd132126ef
2 changed files with 18 additions and 0 deletions
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1
contrib/systemd/osmo-mgw.service
View File

@ -5,6 +5,7 @@ Wants=network-online.target
[Service]
Type=simple
LimitNOFILE=65536
StateDirectory=osmocom
WorkingDirectory=%S/osmocom
Restart=always

17
doc/manuals/chapters/running.adoc
View File

@ -23,3 +23,20 @@ arguments:
Disable colors for logging to stderr. This has mostly been
deprecated by VTY based logging configuration, see <<logging>>
for more information.
=== Configure limits
When servicing hundreds of media endpoints, it may be necessary to adjust the
operating system's limit on open file descriptors for the osmo-mgw process. A
typical default limit imposed by operating systems is 1024; this would be
exceeded by, for example, about 256 active voice calls with 4 RTP/RTPC ports
each, sockets for other interfaces not considered yet.
It should be ok to set an OS limit on open file descriptors as high as 65536
for osmo-mgw, which practically rules out failure from running out of file
descriptors anywhere (<16,000 active calls).
When using systemd, the file descriptor limit may be adjusted in the service
file by the `LimitNOFILE` setting ("Number of Open FILE descriptors"). OsmoMGW
ships a systemd service file with a high LimitNOFILE setting.