Public bug reported:
When my Intel Core2 E6600 is running at stock clocking under heavy load,
only CPU 1 scales up to max speed (2.40GHz). CPU 0 stays at 1.63 GHz,
even if the governor policy is set to "performance" (the default is
"ondemand") on both CPUs. cpufreq-info always reports "current policy:
frequency should be within 1.63 GHz and 1.63 GHz" regardless of what the
frequency governor policy is for CPU 0. CPU 1 seems to work fine.
$ cpufreq-info
cpufrequtils 004: cpufreq-info (C) Dominik Brodowski 2004-2006
Report errors and bugs to cpuf...@lists.linux.org.uk, please.
analyzing CPU 0:
driver: acpi-cpufreq
CPUs which need to switch frequency at the same time: 0
hardware limits: 1.63 GHz - 2.45 GHz
available frequency steps: 2.45 GHz, 1.63 GHz
available cpufreq governors: conservative, ondemand, userspace, powersave,
performance
current policy: frequency should be within 1.63 GHz and 1.63 GHz.
The governor "performance" may decide which speed to use
within this range.
current CPU frequency is 1.63 GHz.
cpufreq stats: 2.45 GHz:0.00%, 1.63 GHz:0.07% (3)
analyzing CPU 1:
driver: acpi-cpufreq
CPUs which need to switch frequency at the same time: 1
hardware limits: 1.63 GHz - 2.45 GHz
available frequency steps: 2.45 GHz, 1.63 GHz
available cpufreq governors: conservative, ondemand, userspace, powersave,
performance
current policy: frequency should be within 1.63 GHz and 2.45 GHz.
The governor "performance" may decide which speed to use
within this range.
current CPU frequency is 2.45 GHz.
cpufreq stats: 2.45 GHz:0.01%, 1.63 GHz:0.06% (5636)
$ grep . /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 15
model name : Intel(R) Core(TM)2 CPU 6600 @ 2.40GHz
stepping : 6
cpu MHz : 1632.000
cache size : 4096 KB
physical id : 0
siblings : 2
core id : 0
cpu cores : 2
apicid : 0
initial apicid : 0
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 10
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 nx lm constant_tsc
arch_perfmon pebs bts pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr
pdcm lahf_lm tpr_shadow
bogomips : 4895.31
clflush size : 64
power management:
processor : 1
vendor_id : GenuineIntel
cpu family : 6
model : 15
model name : Intel(R) Core(TM)2 CPU 6600 @ 2.40GHz
stepping : 6
cpu MHz : 2448.000
cache size : 4096 KB
physical id : 0
siblings : 2
core id : 1
cpu cores : 2
apicid : 1
initial apicid : 1
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 10
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 nx lm constant_tsc
arch_perfmon pebs bts pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr
pdcm lahf_lm tpr_shadow
bogomips : 4896.35
clflush size : 64
power management:
$ lsb_release -rd
Description: Ubuntu 9.04
$ uname -a
Linux host 2.6.28-13-generic #45-Ubuntu SMP Tue Jun 30 19:49:51 UTC 2009 i686
GNU/Linux
** Affects: ubuntu
Importance: Undecided
Status: New
--
CPU scaling does not work on Core2 CPU core 0
https://bugs.launchpad.net/bugs/399806
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