My thesis that I wanted to prove or disprove was that the market seems to

have standardized how they calculate 95th percentile. Years ago if you

asked all your uplinks you'd get wildly different answers. Averages or max

values over days, weeks or months. Rarely would two answers jive.

But it appeared that most providers are now using 5 minute averages as the

value input over a billing month for 95th% calculation. Was this truly

standard now?

The answer is yes. All of our paid transit links use 5 minute averages,

and all but one of the replies to my query here did too.

8 providers use 5 minute averages of 30 second counter checks as the base

value calculated over the billing month.

2 providers use 5 minute averages of 1 minute counter checks as the base

value calculated over the billing month.

8 providers use 5 minute implicit averages (a single counter check) as the

base value calculated over the billing month.*

1 provider uses the maximum value found in 5 minutes of 1 minute counter

checks for the 5 minute value, and calculates that over the billing month.

1 provider uses 5 minute implicit averages (a single counter check) but

calculates that over a fixed 30 day month. (I didn't ask what they did with

the extra days)

At first glance my tendancy would be to say that 20 answers is hardly

authoritative, but the 30 second counters (first listed) comprise 6 of the

top US bit movers, and 2 of the largest bit pushers so I'm satisfied with

the results for my purposes.

* One very large bit mover that I know uses 32 bit counters claimed to only

be checking every 5 minutes. We're pushing enough to them to rotate that

counter in that interval, so I actually disbelieve this answer but I'm

reporting it as they said it.