[Beowulf] Turboboost/IDA on Nehalem

Hearns, John john.hearns at mclaren.com
Fri Jun 18 07:30:12 EDT 2010


Does anyone know much about Turboboost on Nehalem?
I would like to have some indication that this is working, and perhaps
measure what effect it has.
I have enabled Turboboost in the BIOS, however when I modprobe
acpi_cpufreq I get

FATAL: Error inserting acpi_cpufreq
(/lib/modules/2.6.31.12-0.2-desktop/kernel/arch/x86/kernel/cpu/cpufreq/a
cpi-cpufreq.ko): No such device


Dave Jones' blog suggest this is a BIOS issue. Any ideas?
I have tried BIOS flags for hardware and software control of CPU
stepping.

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