[PW_SID:819513] [v2,1/4] knownnetworks: pass scan_bss to known_network_add_frequency #302
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This is taken care of by the individual cache items and if none exist, tar fails.
This prepares to store known frequencies sorted by BSS rank.
Currently a quick scan uses the entire known frequency list so ordering really doesn't matter but improvements will be made here to make quick scans "quicker" for large network deployments (with many known frequencies). To prepare for this the known frequency list has been changed to be sorted by BSS rank rather than most recently seen. This makes a lot more sense because IWD should prefer to scan frequencies that had higher ranked BSS's, not just frequencies that were scanned last on the most recent scan. As far as the disk sync goes the ranking is not included, but ordering is. This really isn't a limitation because when IWD starts up there isn't any guarantee its in the same physical location so old scan ranks are likely not valid anymore. The first set of scans will begin replacing the frequencies loaded from disk.
In very large network deployments there could be a vast amount of APs which could create a large known frequency list after some time once all the APs are seen in scan results. This then increases the quick scan time significantly, in the very worst case (but unlikely) just as long as a full scan. To help with this support in knownnetworks was added to limit the number of frequencies per network. Station will now only get 5 recent frequencies per network making the maximum frequencies 25 in the worst case (~2.5s scan). The magic values are now defines, and the recent roam frequencies was also changed to use this define as well.
Modify the existing frequency test to check that the ordering lines up with the ranking of the BSS. Add a test to check that quick scans limit the number of known frequencies.
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This prepares to store known frequencies sorted by BSS rank.
src/knownnetworks.c | 6 +++---
src/knownnetworks.h | 3 ++-
src/network.c | 6 +++---
3 files changed, 8 insertions(+), 7 deletions(-)