Per Jessen wrote: [...] > I would tend to agree, except I've been monitoring temperatures (with > lm_sensor) and CPU-temp barely goes higher than 55-56C. I'm sure it > would with e.g. 4 copies of mprime, but with 2 it stays in that range.
That reporting is only as good as what the sensor measures at the instant each measurement is taken. It can only be taken as an 'indicator'... >> There is another possibility that's just hit discussion in various >> forums... As a test, can you disable Core #2 (the 3rd core as numbered >> 0 1 2 3) and try your tests again? > > I know there is a control register for that, but I think I'd have to > write some code to get to it :-) > Unless you know of a (linux-based) utility that will do it? You can add "maxcpus=n" onto the kernel boot line to limit the maximum number of CPUs that will be used, so maxcpus=2 would be an interesting test if that then uses only cores #0 and #1. Are there any BIOS settings to tweak? Or does anyone know if a /proc or /sys tweak can enable/disable a CPU in Linux? >> Also, can you _underclock_ the system and again retest? > > Yep, just tried running the memory at 667MHz (normally rated for > 800MHz), no change. > I couldn't find a BIOS option that would let me underclock the CPU. Do you need to tweak the memory multiplier to change the CPU clock?... Good luck, Martin -- ---------------- Martin Lomas [EMAIL PROTECTED] ---------------- _______________________________________________ Prime mailing list [email protected] http://hogranch.com/mailman/listinfo/prime
