We just published an initial architecture and requirements draft on large-scale performance measurement architectures at http://datatracker.ietf.org/doc/draft-schulzrinne-lmap-requirements/ This is motivated by the FCC "Measuring Broadband America" effort [see http://www.fcc.gov/measuring-broadband-america/2012/july] and related efforts elsewhere. Comments on this new effort are appreciated on the LMAP mailing list [https://www.ietf.org/mailman/listinfo/lmap] Henning