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systemd,manual: set LimitNOFILE=65536 

A typical OS imposed limit is 1024 open FD, which is too low when there
are hundreds of BTS.

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

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

Related: OS#6256
Change-Id: I26c4058484b11ff1d035a919bf88824c3af14e71
This commit is contained in:
Neels Hofmeyr 2023-11-30 02:31:10 +01:00
parent 6766608231
commit 65e257effb
2 changed files with 19 additions and 0 deletions
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1
contrib/systemd/osmo-bsc.service
View File

@ -7,6 +7,7 @@ Wants=network-online.target
[Service]
Type=simple
Restart=always
LimitNOFILE=65536
StateDirectory=osmocom
WorkingDirectory=%S/osmocom
ExecStart=/usr/bin/osmo-bsc -c /etc/osmocom/osmo-bsc.cfg -s

18
doc/manuals/chapters/running.adoc
View File

@ -69,6 +69,24 @@ To run multiple OsmoBSC instances on the same A-interface (SCCP/M3UA), each BSC
has to configure a distinct point-code. See <<cs7_config>>.
=== Configure limits
When connecting hundreds of TRX to OsmoBSC, it may be necessary to adjust the
operating system's limit on open file descriptors for the osmo-bsc process. A
typical default limit imposed by operating systems is 1024; this would be
exceeded by, for example, about 205 BTS with 4 TRX each. (Each BTS with 4 TRX
requires 5 file descriptors for Abis; 205 * 5 already exceeds 1024, 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-bsc, which practically rules out failure from running out of file
descriptors anywhere (<50,000 TRX).
When using systemd, the file descriptor limit may be adjusted in the service
file by the `LimitNOFILE` setting ("Number of Open FILE descriptors"). OsmoBSC
ships a systemd service file with a high LimitNOFILE setting.
=== Configure primary links
==== Connect to an MSC's _A_ interface