Martin wrote: > 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?
By the infinite flexibility of Linux! :-) Try: echo 0 >> /sys/devices/system/cpu/cpu2/online to disable cpu2 Try: echo 1 >> /sys/devices/system/cpu/cpu2/online to enable oncemore. >>> 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?... Let us know what you find. Good luck, Martin -- ---------------- Martin Lomas [EMAIL PROTECTED] ---------------- _______________________________________________ Prime mailing list [email protected] http://hogranch.com/mailman/listinfo/prime
