[Beowulf] Turboboost/IDA on Nehalem

Douglas Guptill douglas.guptill at dal.ca
Fri Jun 18 08:27:20 EDT 2010

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/
> 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

Which seems to have worked.


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.guptill at dal.ca
  Oceanography Department               fax:   902-494-3877
  Dalhousie University
  Halifax, NS, B3H 4J1, Canada

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