On Fri, Jun 18, 2010 at 12:30:12PM +0100, Hearns, John wrote: > 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.
Here is what I get: scrum:~# uname -a Linux scrum 2.6.26-2-amd64 #1 SMP Wed May 12 18:03:14 UTC 2010 x86_64 GNU/Linux scrum:~# modprobe -nv acpi_cpufreq insmod /lib/modules/2.6.26-2-amd64/kernel/drivers/cpufreq/freq_table.ko insmod /lib/modules/2.6.26-2-amd64/kernel/arch/x86/kernel/cpu/cpufreq/acpi-cpu scrum:~# modprobe acpi_cpufreq scrum:~# Which seems to have worked. HTH, Douglas. P.S. `less /proc/cpuinfo` starts with: processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 26 model name : Intel(R) Core(TM) i7 CPU 920 @ 2.67GHz stepping : 5 cpu MHz : 2668.000 cache size : 8192 KB physical id : 0 siblings : 8 core id : 0 cpu cores : 4 apicid : 0 initial apicid : 0 fpu : yes fpu_exception : yes cpuid level : 11 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good pni monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr sse4_1 sse4_2 popcnt lahf_lm ida bogomips : 5349.70 clflush size : 64 cache_alignment : 64 address sizes : 36 bits physical, 48 bits virtual power management: -- Douglas Guptill voice: 902-461-9749 Research Assistant, LSC 4640 email: douglas.gupt...@dal.ca Oceanography Department fax: 902-494-3877 Dalhousie University Halifax, NS, B3H 4J1, Canada _______________________________________________ Beowulf mailing list, Beowulf@beowulf.org sponsored by Penguin Computing To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf