diff options
| author | Neels Hofmeyr <nhofmeyr@sysmocom.de> | 2023-11-30 02:31:10 +0100 |
|---|---|---|
| committer | Neels Hofmeyr <nhofmeyr@sysmocom.de> | 2023-11-30 18:03:31 +0100 |
| commit | 65e257effb70dc12eb9c7162ad52580474838169 (patch) | |
| tree | 246a76e88a2bbfb449bf0b4f76822d79bc3d8473 | |
| parent | 6766608231c51179260ce6a258056817da46b5eb (diff) | |
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
| -rw-r--r-- | contrib/systemd/osmo-bsc.service | 1 | ||||
| -rw-r--r-- | doc/manuals/chapters/running.adoc | 18 |
2 files changed, 19 insertions, 0 deletions
diff --git a/contrib/systemd/osmo-bsc.service b/contrib/systemd/osmo-bsc.service index a345c474e..c8dc877c3 100644 --- a/contrib/systemd/osmo-bsc.service +++ b/contrib/systemd/osmo-bsc.service @@ -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 diff --git a/doc/manuals/chapters/running.adoc b/doc/manuals/chapters/running.adoc index 9ff546c40..0c6d4fb9b 100644 --- a/doc/manuals/chapters/running.adoc +++ b/doc/manuals/chapters/running.adoc @@ -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 |