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-   -   How to Know if my Turbo mode is enabled? (https://www.linuxquestions.org/questions/linux-newbie-8/how-to-know-if-my-turbo-mode-is-enabled-788880/)

guessity 02-13-2010 07:18 AM
How to Know if my Turbo mode is enabled?
 
I have a server hosted elsewhere and I am wondering if there is a way to know if my Server has turbo mode enabled or not?

I have i5 @ 750 Intel. It support Turbo mode but am not sure if my server has got it enabled or not.

r3sistance 02-13-2010 07:25 AM
At a guess, "/proc/cpuinfo" might tell you, just view it with cat or a text editor. If not then I am not sure, other then bios what means rebooting the server while at it or with a KVMoIP device connected to it.

guessity 02-13-2010 07:27 AM
Code:
root@server [~]# cat /proc/cpuinfo
processor      : 0
vendor_id      : GenuineIntel
cpu family      : 6
model          : 30
model name      : Intel(R) Core(TM) i5 CPU        750  @ 2.67GHz
stepping        : 5
cpu MHz        : 1200.000
cache size      : 8192 KB
physical id    : 0
siblings        : 4
core id        : 0
cpu cores      : 4
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 syscall nx rdtscp lm constant_tsc ida nonstop_tsc pni monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr sse4_1 sse4_2 popcnt lahf_lm
bogomips        : 5333.42
clflush size    : 64
cache_alignment : 64
address sizes  : 36 bits physical, 48 bits virtual
power management: [8]
I get this info.

The same is for other 4 cores. Can you make out something?

r3sistance 02-13-2010 07:46 AM
Hi,

Unfortantly I can't find out if there is a flag for Turbo Boost, however your CPU appears to have dynamic underclocked itself, likely due to low usage. Others might have a better idea then I of what to check.

guessity 02-13-2010 08:35 AM
Quote:
Originally Posted by r3sistance (Post 3862447)
Hi,

Unfortantly I can't find out if there is a flag for Turbo Boost, however your CPU appears to have dynamic underclocked itself, likely due to low usage. Others might have a better idea then I of what to check.
How do you know if its underclocked itself?

Plz tell me so I can report to my host.

r3sistance 02-13-2010 08:48 AM
model name : Intel(R) Core(TM) i5 CPU 750 @ 2.67GHz
cpu MHz : 1200.000

1200 MHz is 1.2GHz, not 2.67 GHz. This is nothing to do with your host, this is a genetic way in what the CPU works. The CPU is not under load and so it underclocks itself, should the CPU come under sufficent load it should return to 2.67GHz. It might be that it hasn't updated the file with any changes however when it does come under load... but at the time of creation of the file. The file itself is only temporary and disappears when the server is powered down and is regenerated when it is repowered, I am not sure on the update cycles for the file unfortantly.

To note, what you are after, Turbo Boost is the reverse of this, where when under heavy load, should the CPU be able to (given temp and frequency allowances) it will dynamically overcloak itself. I am unable to tell you if this is enabled.

damgar 02-13-2010 08:52 AM
PHP Code:
model name      : Intel(R) Core(TM) i5 CPU         750  @ 2.67GHz
cpu MHz         : 1200.000 
The first line tells you what frequency the cpu was intended to run at under a typical load. The second tells you what it is actually running at at the moment.

It all gets a little confusing since with turbo mode the processor will run a little over 2.67 under heavy loads and can run quite a bit under that at idle/low loads.

GreyGnome 06-20-2019 04:26 PM
Easy Peazy
 
I was looking for this answer today, a Google search brings me here in 2019. I found it at RedHat, thought I'd share:

For a modern Intel CPU (Nehalem or newer) and a modern Linux (I'm sure any v. 3 kernel will work, and probably anything later than 2.6.32):

grep flags /proc/cpuinfo | grep -q " ida " && echo Turbo mode is on || echo Turbo mode is off

Virtual machines hosted under the Xen kernel should see the flag.


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