I'm trying to use the MaxMind GeoIP database, and I notice that the C API provides a bunch of different cacheing modes as flags to the
GeoIP_open initialization call.
these are flag bits, so you can provide any set of them, but there's no documentation as to what these flags mean or what they do, or (perhaps most important) how they interact.
The benchmarks page indicates that
GEOIP_MEMORY_CACHE makes it faster while
GEOIP_CHECK_CACHE makes it slower, but there's no indication as to why you would want to use (or not use) any of these flags.