Eddie - (Apologies, I am getting to email later and later...)
However, to be honest, I'd say that RFC3448 appears to define it as "number of packets received since last loss event". I think this is a misstatement in RFC3448 and should be considered for fixing in RFC3448bis. Every other loss interval is defined as a length in sequence space INCLUDING lost and marked packets (RFC3448 5.3).
Yep. Fixed. Many thanks. - Sally http://www.icir.org/floyd/