[Observium] Prevent creation of RRD files on ignored/disabled ports

I'm running Observium on a fairly large network with a few Cisco 7200's running 1000+ subinterfaces and 1000+ virtual-access interfaces. These interfaces are ignored with the "bad_if_regexp" configuration variable in config.php but RRD files are still generated and the "device total traffic" graph takes ages to generate which is not optimal. The RRD files are using lot's of diskspace and we're really only interested in uplinks instead of customer interfaces. Is there a way to prevent interfaces in the bad_if or bad_if_regexp to be polled altogether without writing RRD files?

Kind regards,

Remco Bressers Signet B.V.