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maggie

Member

Registered: 2011-02-12

Posts: 255

Confused about turbo on a new Ivybridge server

I have a new Ivybridge PC. I am confused about the turbo setting which is enabled in the BIOS. I am compiling my new kernel and i7z shows the frequency running at 3.7GHz when it is compiling. Ark shows that my processors has turbo mode that should be 3.9GHz but this never goes over 3.7GHz. Is this normal?

# i7z
i7z DEBUG: i7z version: svn-r93-(27-MAY-2013)
i7z DEBUG: Found Intel Processor
i7z DEBUG:    Stepping 9
i7z DEBUG:    Model a
i7z DEBUG:    Family 6
i7z DEBUG:    Processor Type 0
i7z DEBUG:    Extended Model 3
i7z DEBUG: msr = Model Specific Register
i7z DEBUG: Detected an i7 - 22nm (ivy bridge) 
i7z DEBUG: msr device files exist /dev/cpu/*/msr
i7z DEBUG: You have write permissions to msr device files

------------------------------
--[core id]--- Other information
-------------------------------------
--[0] Processor number 0
--[0] Socket number/Hyperthreaded Sibling number  0,4
--[0] Core id number 0
--[0] Display core in i7z Tool: Yes

--[1] Processor number 1
--[1] Socket number/Hyperthreaded Sibling number  0,5
--[1] Core id number 1
--[1] Display core in i7z Tool: Yes

--[2] Processor number 2
--[2] Socket number/Hyperthreaded Sibling number  0,6
--[2] Core id number 2
--[2] Display core in i7z Tool: Yes

--[3] Processor number 3
--[3] Socket number/Hyperthreaded Sibling number  0,7
--[3] Core id number 3
--[3] Display core in i7z Tool: Yes

--[4] Processor number 4
--[4] Socket number/Hyperthreaded Sibling number  0,0
--[4] Core id number 0
--[4] Display core in i7z Tool: No

--[5] Processor number 5
--[5] Socket number/Hyperthreaded Sibling number  0,1
--[5] Core id number 1
--[5] Display core in i7z Tool: No

--[6] Processor number 6
--[6] Socket number/Hyperthreaded Sibling number  0,2
--[6] Core id number 2
--[6] Display core in i7z Tool: No

--[7] Processor number 7
--[7] Socket number/Hyperthreaded Sibling number  0,3
--[7] Core id number 3
--[7] Display core in i7z Tool: No

Socket-0 [num of cpus 4 physical 4 logical 8] 3,
Socket-1 [num of cpus 0 physical 0 logical 0] 
GUI has been Turned ON
i7z DEBUG: Single Socket Detected
i7z DEBUG: In i7z Single_Socket()
i7z DEBUG: guessing Ivy Bridge

Cpu speed from cpuinfo 3499.00Mhz
cpuinfo might be wrong if cpufreq is enabled. To guess correctly try estimating via tsc
Linux's inbuilt cpu_khz code emulated now
True Frequency (without accounting Turbo) 3499 MHz
  CPU Multiplier 35x || Bus clock frequency (BCLK) 99.97 MHz

Socket [0] - [physical cores=4, logical cores=8, max online cores ever=4]
  TURBO ENABLED on 4 Cores, Hyper Threading ON
  Max Frequency without considering Turbo 3598.97 MHz (99.97 x [36])
  Max TURBO Multiplier (if Enabled) with 1/2/3/4 Cores is  39x/39x/38x/37x
  Real Current Frequency 3698.94 MHz [99.97 x 37.00] (Max of below)
        Core [core-id]  :Actual Freq (Mult.)      C0%   Halt(C1)%  C3 %   C6 %   C7 %  Temp      VCore
        Core 1 [0]:       3698.94 (37.00x)      98.1       0       0       0       0    72      1.1609
        Core 2 [1]:       3698.94 (37.00x)      99.4       0       0       0       0    73      1.1609
        Core 3 [2]:       3698.94 (37.00x)      99.9       0       0       0       0    71      1.1609
        Core 4 [3]:       3698.94 (37.00x)       100       0       0       0       0    68      1.1609



C0 = Processor running without halting
C1 = Processor running with halts (States >C0 are power saver modes with cores idling)
C3 = Cores running with PLL turned off and core cache turned off
C6, C7 = Everything in C3 + core state saved to last level cache, C7 is deeper than C6
  Above values in table are in percentage over the last 1 sec
[core-id] refers to core-id number in /proc/cpuinfo
'Garbage Values' message printed when garbage values are read
  Ctrl+C to exit

graysky

Wiki Maintainer

From: :wq

Registered: 2008-12-01

Posts: 10,731

Website

Re: Confused about turbo on a new Ivybridge server

Seems normal to me.  Look more closely at your i7z output:

I have a new Ivybridge PC.

...

# i7z
i7z DEBUG: i7z version: svn-r93-(27-MAY-2013)
i7z DEBUG: Found Intel Processor

...

Socket [0] - [physical cores=4, logical cores=8, max online cores ever=4]
  TURBO ENABLED on 4 Cores, Hyper Threading ON
  Max Frequency without considering Turbo 3598.97 MHz (99.97 x [36])
  Max TURBO Multiplier (if Enabled) with 1/2/3/4 Cores is  39x/39x/38x/37x

...

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