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Bug#360773: reproducible in 2.6.18?

On Mon, 15 Jan 2007, dann frazier wrote:

hey Giuseppe,
 Can you reproduce this with the 2.6.18 kernel in sid?

Unfortunately yes: with the latest kernel (2.6.18-3-686) I get:

alien:/sys/devices/system/cpu/cpu0/cpufreq# cat scaling_available_frequencies
2333275 2666600

While under a kernel <= 2.6.15 I can scale from 333MHz up to 2,66GHz.
I don't know if this is due to a bug in my cpu model, and the kernel
must do not scale on other frequencies to avoid problems.

Under 2.6.15 I'm not experiencing any trobules (the system is stable, DMA works well...).

In your opinion can this depend on some microcode related issue? I've
installed microcode.ctl and my CPU gets "upgraded" on boot. Does
cpufreq modules get loaded before this? Should instead I try to load them after the upgrade?

Keeping the cpu hot by running costantly at 2,33GHz is not an option for me (this is a laptop).

More info about my cpu:

$ cat /proc/cpuinfo
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 15
model           : 2
model name      : Intel(R) Pentium(R) 4 CPU 2.66GHz
stepping        : 9
cpu MHz         : 2333.275
cache size      : 512 KB
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 2
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 up cid xtpr
bogomips        : 5315.72

From dmesg:

Mount-cache hash table entries: 512
CPU: After generic identify, caps: bfebfbff 00000000 00000000 00000000 00004400 00000000 00000000
CPU: After vendor identify, caps: bfebfbff 00000000 00000000 00000000 00004400 00000000 00000000
CPU: Trace cache: 12K uops, L1 D cache: 8K
CPU: L2 cache: 512K
CPU: Hyper-Threading is disabled
CPU: After all inits, caps: bfebfbff 00000000 00000000 00000080 00004400 00000000 00000000
Intel machine check architecture supported.
Intel machine check reporting enabled on CPU#0.
CPU0: Intel P4/Xeon Extended MCE MSRs (12) available
CPU0: Thermal monitoring enabled
Compat vDSO mapped to ffffe000.
Checking 'hlt' instruction... OK.
SMP alternatives: switching to UP code
Freeing SMP alternatives: 16k freed
ACPI: Core revision 20060707
CPU0: Intel(R) Pentium(R) 4 CPU 2.66GHz stepping 09

Giuseppe D'Angelo

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