What does RRD Summary and interface data in/out actually count?

[redmaw]

Hi,

I was playing around with pfsense to a bit and noticed that the total data counts from RRD Summary and Interfaces summary were a bit off. Are they measuring differently or is this just a odd discrepancy?

Example data from WAN interface:
Status -> Interfaces: 2569261/1366710 (1.10 GiB/290.66 MiB) = 1126.4 MiB + 290.66 MiB = 1.48589511 GiB
Status -> RRD Summary: 1517 MBytes (1446.724 MiB)