|
North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: 95th Percentile again!
[ On Saturday, June 2, 2001 at 23:17:48 (-0400), Richard A. Steenbergen wrote: ] > Subject: Re: 95th Percentile again (was RE: C&W Peering Problem?) > > No matter how you stack it, if you miss a rate sample there is no way to > go back and get the data again. You either discard it and lose the ability > to bill the customer for it (which demands high availability polling > systems), or you make up a number and hope the customer doesn't notice. > Volume polling does not suffer from this problem. What the heck are you talking about? Only a totally amateur design would fail to account for the possibility of a dropped sample (or any other of several critical issues faced by anyone using counters to determine the average or Nth percentile rates). In fact the accounting for bulk throughput per period is done in almost exactly the same as any rate-based accounting too (only the counter sample time might differ, but of course you can't stretch it too far for the former case lest you risk an undetectable wrap-around event). -- Greg A. Woods +1 416 218-0098 VE3TCP <[email protected]> <[email protected]> Planix, Inc. <[email protected]>; Secrets of the Weird <[email protected]>
|