[gentoo-user] The meaning of number in brackets in /proc/cpuinfo "power management"?

[gentoo-user] The meaning of number in brackets in /proc/cpuinfo "power management"?

[Pandu Poluan]

Hello list!

Does anyone know the meaning of the 'number between brackets' in the
"power management" line of /proc/cpuinfo?

For instance (I snipped the "flags" line to not clutter the email:

processor       : 0
vendor_id       : AuthenticAMD
cpu family      : 21
model           : 2
model name      : AMD Opteron(tm) Processor 6386 SE
stepping        : 0
cpu MHz         : 2800.110
cache size      : 2048 KB
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 13
wp              : yes
flags           : --snip--
bogomips        : 5631.71
clflush size    : 64
cache_alignment : 64
address sizes   : 48 bits physical, 48 bits virtual
power management: ts ttp tm 100mhzsteps hwpstate [9] [10]

What's "[9]" and "[10]" supposed to mean?

(Note: The OS is not actually Gentoo, but this list is sooo
knowledgeable, and methinks the output of /proc/cpuinfo is quite
universal...)


Rgds,
-- 
FdS Pandu E Poluan
~ IT Optimizer ~

 • LOPSA Member #15248
 • Blog : http://pepoluan.tumblr.com
 • Linked-In : http://id.linkedin.com/in/pepoluan

Re: [gentoo-user] The meaning of number in brackets in /proc/cpuinfo "power management"?

[Todd Goodman]

* Pandu Poluan <pandu@poluan.info> [130920 03:45]:
> Hello list!
> 
> Does anyone know the meaning of the 'number between brackets' in the
> "power management" line of /proc/cpuinfo?
> 
> For instance (I snipped the "flags" line to not clutter the email:
> 
> processor       : 0
> vendor_id       : AuthenticAMD
> cpu family      : 21
> model           : 2
> model name      : AMD Opteron(tm) Processor 6386 SE
> stepping        : 0
> cpu MHz         : 2800.110
> cache size      : 2048 KB
> fdiv_bug        : no
> hlt_bug         : no
> f00f_bug        : no
> coma_bug        : no
> fpu             : yes
> fpu_exception   : yes
> cpuid level     : 13
> wp              : yes
> flags           : --snip--
> bogomips        : 5631.71
> clflush size    : 64
> cache_alignment : 64
> address sizes   : 48 bits physical, 48 bits virtual
> power management: ts ttp tm 100mhzsteps hwpstate [9] [10]
> 
> What's "[9]" and "[10]" supposed to mean?
> 
> (Note: The OS is not actually Gentoo, but this list is sooo
> knowledgeable, and methinks the output of /proc/cpuinfo is quite
> universal...)

I don't know for sure but looking in arch/x86/cpu/{powerflags,proc}.c it
looks like your kernel doesn't have a text description for power flag
bits 9 and 10.

In Linux 3.11.1 they are:

[9] - "cpb",  /* core performance boost */
[10] - "eff_freq_ro", /* Readonly aperf/mperf */

Todd