On Thu, 7 Oct 2010, Stephen Boyd wrote: > Why doesn't any other architecture use assembly for their lpj code? They > may use headers with assembly in them or C code with assembly in them, > but they don't write all of the delay code in assembly and rely on > function interleaving. This leads me to believe other arches aren't > concerned about compiler optimizations breaking lpj cmdline parameters, > so why should ARM be concerned? > > I tested the theory out and scaled down the CPU frequency to 19.2 MHz > and then called calibrate_delay(). Before and after applying this series > I got the same results. > > Calibrating delay loop... 12.67 BogoMIPS (lpj=63360) > > Jumping up to 1.2 GHz and calling calibrate_delay() gives me the same > before and after > > Calibrating delay loop... 792.98 BogoMIPS (lpj=3964928) OK, fair enough. > I don't have access to a machine capable of running slower than 19.2 > MHz. Maybe machines running in the KHz range would experience differences? Don't worry, I doubt any ARM processor capable of running Linux ever was that slow. Nicolas -- To unsubscribe from this list: send the line "unsubscribe linux-arch" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
