On 31/08/2011, at 1:58 AM, Jim Gettys wrote:

On 08/29/2011 11:42 PM, Adrian Chadd wrote:

quoted

On 30 August 2011 11:34, Tom Herbert [off-list ref] wrote:

C(P) is going to be quite variable - a full frame retransmit of a 4ms
long aggregate frame is SUM(exponential backoff, grab the air,
preamble, header, 4ms, etc. for each pass.)

It's not clear to me that doing heroic measures to compute the cost is
going to be worthwhile due to the rate at which the costs can change on
wireless; just getting into the rough ballpark may be enough. But
buffering algorithms and AQM algorithms are going to need an estimate of
the *time* it will take to transmit data, more than # of bytes or packets.

That's not heroic measures; mac80211 needs all the code to calculate these times anyway, it's just a matter of collecting together some things we already know and calling the right function.

Andrew