On Wed, 13 Dec 2017, Jonathan Morton wrote:
Occasionally, of course, practically everyone in the country wants to tune into coverage of some event at the same time. More commonly, they simply get home from work and school at the same time every day. That breaks the assumptions behind pure statistical multiplexing, and requires a greater provisioning factor.
Reasonable operators have provisioning guidelines that look at actual usage, although they probably look at it in 5 minute averages and not millisecond as done here in this context.
So they might say "if busy hour average is over 50% 3 days in a week" this will trigger a provisioning alarm for that link, and the person (or system) will take a more detailed look and look at 5minute average graph and decide if this needs to be upgraded or not.
For me the interesting point is always "what's going on in busy hour of the day" and never "what's the monthly average transferred amount of data".
Of course, this can hide subsecond bufferbloat extremely well (and has), but at least this is typically how statistical overprovisioning is done. You look at actual usage and make sure your network is never full for any sustained amount of time, in normal operation, and make sure you perform upgrades well before the growth has resulted in network being full.
-- Mikael Abrahamsson email: swm...@swm.pp.se _______________________________________________ Cerowrt-devel mailing list Cerowrt-devel@lists.bufferbloat.net https://lists.bufferbloat.net/listinfo/cerowrt-devel
