> 9919_unit Linux 2.6.25 powerpc-linux-gnu 434 32 32 > > 1.0000 1 > > 9919_unit Linux 2.6.18 powerpc-linux-gnu 445 32 32 > > 1.0100 1 > > Hmm, processor MHz is off by 11/445
I noticed that. > And memory latency is off 13/500. > > That sounds like it will be 16/666. > > Are you using the same board and the same firmware? Yes. Same board, same firmware, same filesystem, just booted with different kernels. > > If so, look at /proc/cpuinfo and/or the boot log to see what > frequency linux thinks the processor is running at. It sounds > like someone introduced or fixed a rounding error error calculating > the timebase frequency for your board. 2.6.18 /proc/cpuinfo processor : 0 cpu : G2_LE revision : 1.4 (pvr 8082 2014) bogomips : 296.96 chipset : 8250 vendor : Innovative Systems LLC machine : AP Gold mem size : 0x40000000 console baud : 115200 core clock : 447 MHz CPM clock : 298 MHz bus clock : 99 MHz 2.6.25 /proc/cpuinfo processor : 0 cpu : G2_LE clock : 447.897600MHz revision : 1.4 (pvr 8082 2014) bogomips : 49.53 timebase : 24883200 platform : Innovative Systems ApMax > Please try the sleep test: sleep for 100 seconds, and time with > either a stopwatch or another system. I think you will find they > take different amounts of time, and all the results need to be scaled. > You might be able to see it reading the hardware clock. Sleep 100 takes excactly 100 seconds on both kernels (verified with stopwatch and external ntp server) _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
