Pau Espin
85062ccad3
It was found that, on a busy osmo-bsc (>1000 concurrent calls spread over several BTS), the CPU consumption looking up for gsm_subscriber_conn based on SCCP conn_id can take a considerable amount of time (>5% of osmo-bsc already taking 70% of the CPU time on the core it is running on). The huge CPU consumption happens because a linear search is done (llist) over the entire list of SCCP connections every time an SCCP message is handled. In order to optimize this lookup, this patch introduces a new struct bsc_sccp_inst which becomes associated to the libosmo-sccp osmo_sccp_instance. Each of this strucs maintains an rbtree of gsm_subscriber_conn ordered by conn_id. As a result algorithmic complexity adds O(log(N)) during insert, lookup and delete of SCCP conns, but gets rid of O(N) previous lookup. As a plus, finding a new conn_id now takes generally O(log(N)), while before it used to take O(N). Related: SYS#6200 Change-Id: I667d3ec1dad0ab7bc0fa4799d9611f3a914d07e5 |
||
|---|---|---|
| contrib | ||
| debian | ||
| doc | ||
| include | ||
| m4 | ||
| src | ||
| tests | ||
| .gitignore | ||
| .gitreview | ||
| .mailmap | ||
| AUTHORS | ||
| COPYING | ||
| Makefile.am | ||
| README.md | ||
| README.vty-tests | ||
| TODO-RELEASE | ||
| configure.ac | ||
| git-version-gen | ||
| osmoappdesc.py | ||
README.md
osmo-bsc - Osmocom BSC Implementation
This repository contains a C-language implementation of a GSM Base Station Controller (BSC). IT is part of the Osmocom Open Source Mobile Communications project.
OsmoBSC exposes
- A over IP towards an MSC (e.g. OsmoMSC): 3GPP AoIP or SCCPlite
- Abis interfaces towards various kinds of BTS (osmo-bts, sysmobts, nanoBTS, Siemens, Nokia, Ericsson)
- The Osmocom typical telnet VTY and CTRL interfaces.
- The Osmocom typical statsd exporter.
- Cell Broadcast Service Protocol (CBSP) towards a CBC (Cell Broadcast Centre, such as osmo-cbc).
- Lb interface towards a SMLC (Serving Mobile Location Centre, such as osmo-smlc).
Homepage
You can find the OsmoBSC issue tracker and wiki online at https://osmocom.org/projects/osmobsc and https://osmocom.org/projects/osmobsc/wiki.
GIT Repository
You can clone from the official osmo-bsc.git repository using
git clone https://gitea.osmocom.org/cellular-infrastructure/osmo-bsc
There is a web interface at https://gitea.osmocom.org/cellular-infrastructure/osmo-bsc
Documentation
User Manuals and VTY reference manuals are [optionally] built in PDF form as part of the build process.
Pre-rendered PDF version of the current "master" can be found at User Manual as well as the VTY Reference Manual
There also is an Abis reference Manual describing the OsmoBTS specific A-bis dialect, as well as a CBSP Reference Maunal describing the level of CBSP conformance.
Mailing List
Discussions related to osmo-bsc are happening on the openbsc@lists.osmocom.org mailing list, please see https://lists.osmocom.org/mailman/listinfo/openbsc for subscription options and the list archive.
Please observe the Osmocom Mailing List Rules when posting.
Contributing
Our coding standards are described at https://osmocom.org/projects/cellular-infrastructure/wiki/Coding_standards
We us a gerrit based patch submission/review process for managing contributions. Please see https://osmocom.org/projects/cellular-infrastructure/wiki/Gerrit for more details
The current patch queue for osmo-bsc can be seen at https://gerrit.osmocom.org/#/q/project:osmo-bsc+status:open
History
OsmoBSC originated from the OpenBSC project, which started as a minimalistic all-in-one implementation of the GSM Network. In 2017, OpenBSC had reached maturity and diversity (including M3UA SIGTRAN and 3G support in the form of IuCS and IuPS interfaces) that naturally lead to a separation of the all-in-one approach to fully independent separate programs as in typical GSM networks.
OsmoBSC was one of the parts split off from the old openbsc.git. Before, it worked as a standalone osmo-bsc binary as well as a combination of libbsc and libmsc, i.e. the old OsmoNITB. Since the standalone OsmoMSC with a true A interface (and IuCS for 3G support) is available, OsmoBSC exists only as a separate standalone entity.
OsmoBSC-NAT is a specialized solution to navigating RTP streams through a NAT. (Todo: describe in more detail)