Feature #1974
openVLR: high water mark on subscriber storage
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Description
In libvlr, we (will) keep every subscriber in RAM as long as it still has valid auth tuples (3GPP TS 33.102 Annex C.2.3).
Most subscribers will still have auth tuples left upon detaching, so we would store all subscribers.
Implement a configurable way of limiting the number of subscribers kept in RAM, e.g. a fixed max size.
If this is reached, discard those subscribers that have been inactive for the longest time first.
Related issues
Updated by neels about 7 years ago
- Related to Feature #1973: VLR: efficient subscriber lookup added
Updated by neels over 6 years ago
Before the VLR, there were VTY commands to mark a subscriber to be kept in ram, i.e. to not drop it from in-ram structures because we no longer use it, in order to allow continuously querying it from the vty. When we implement subscriber removal, we may also need such mechanisms again.
Updated by laforge almost 2 years ago
- Category set to VLR
Related: https://gerrit.osmocom.org/c/osmo-msc/+/28116 introduces at least a stat_item for the number of subscribers.