The Tech Report podcast did an interview with David Kanter earlier this year. David Kanter is an industry veteran who runs http://www.realworldtech.com/, as well as being a regular contributor to the Microprocessor Report. I have read the MPR since my PhD days, and it is still one of the best places for information on new chips. The subject of the podcast episode was an analysis of the somewhat mysterious Softmachines “VISC” processor architecture. However, it rather turned into a very good discussion on how you do performance predictions, performance projections of competing systems, and the nature of benchmarking and benchmark numbers.