In message <200510281257.22650.david.jander at protonic.nl> you wrote: > > > What is 'a' and 'b'? The only other explanation I can see is that your > > "Do something" is more memory heavy than you think - array calculations? > > (Cache problems should probably give a worse result, but you could check > > that those config registers are the same). > > They are just integers with fixed start values. These are in the loop, so > it's > not an empty loop and hopefully the compiler won't out-optimize it so easily > (that is of course without specifying any optimization flags). Please don't > tell me it's a lousy benchmark, because I already know that! Be it as lousy > as it is, I shouldn't get _those_ results IMHO.
Indeed, you should not get such results. If you compare with the lmbench results of our 2.4/2.6 comparison, you will notice that we did NOT see such behaviour. There was a perfromnce degradation for pure integer tests, due to increased system overhead, but far from a factor of 2. See http://www.denx.de/wiki/pub/Know/Linux24vs26/lmbench_results Best regards, Wolfgang Denk -- Software Engineering: Embedded and Realtime Systems, Embedded Linux Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de A fanatic is a person who can't change his mind and won't change the subject. - Winston Churchill
