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rmcarlsson
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Joined: 18 Dec 2007
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Location: HAMMARÖ
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 Posted: Fri Apr 11, 2008 10:58 am Post subject: Intel enhanced speedstep |
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Dear forum,
does anyone know where I can find information about the available "cpu throttling states" eg. the available frequencies in intel enhanced speedstep for Intel E6xxx, E8xxx and E2xxx. I have tried Intel website but I can not find anything useful.
For my E6300 I can only find two states and the difference is low, like 15%, not so useful.
Best regrads
/ Mikael |
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massimo
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| Posted: Fri Apr 11, 2008 11:28 am Post subject: |
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How did you find these states? Did get the available states from /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies?
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d2_racing
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Joined: 25 Apr 2005
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| Posted: Fri Apr 11, 2008 11:30 am Post subject: |
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In fact, theses setting are inside /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies
Also, what governor are you using right now ? |
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rmcarlsson
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Joined: 18 Dec 2007
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| Posted: Wed Apr 16, 2008 8:40 pm Post subject: |
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Hi,
my question is "Where can I find specifications that states the supported frequencies for different cpu's, like E8400 0r E2160?". I am not interrested in the Linux interface for controlling the cpu states.
Thanks.
/ Mikael |
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coolsnowmen
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coolsnowmen
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| Posted: Thu Apr 17, 2008 3:05 am Post subject: Re: Intel enhanced speedstep |
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| rmcarlsson wrote: | | For my E6300 I can only find two states and the difference is low, like 15%, not so useful. |
If I understand correctly, you should have 7 or 8 possible states
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rmcarlsson
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Joined: 18 Dec 2007
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| Posted: Thu Apr 17, 2008 11:03 am Post subject: |
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Hi,
I just looked in the E6000 specification and I can not find any information about the number of states. In what document and on what page did you dig up "7 or 8".
Best regards
Mikael |
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coolsnowmen
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| Posted: Thu Apr 17, 2008 1:25 pm Post subject: |
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Its a good think acrobat has a search function, because I don't exactly relish combing through 100s of pages of documentation when RTFM is an acceptable response.
5.2.3 starts on page 96
ftp://download.intel.com/design/processor/datashts/313278.pdf
| Quote: | On-Demand mode, the duty cycle of the clock modulation is programmable via
bits 3:1 of the same IA32_CLOCK_MODULATION MSR. In On-Demand mode, the duty
cycle can be programmed from 12.5% on/ 87.5% off to 87.5% on/ 12.5% off in 12.5%
increments. |
For what its worth, I searched for "clock"
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rmcarlsson
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| Posted: Thu Apr 17, 2008 1:41 pm Post subject: |
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Strange, as stated before I only see two states. Any ideas?
/ Mikael |
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coolsnowmen
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| Posted: Thu Apr 17, 2008 10:41 pm Post subject: |
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I thought you said | Quote: | | I am not interrested in the Linux interface for controlling the cpu states. |
I also have 2 states. 2.4Ghz,and 3.0 Ghz on my Core duo (whatever E number maps to 3.0Ghz). That is a 20% change so I wonder what I am missing.
alas, may I ask exactly what states you have (including the maximum).
I'm using the newer 2.6.24 driver (acpi-cpufreq) One would have to ask kernel knowledgeable people why. Perhaps it would be worth compiling a non-smp kernel to see if that changes anything (but it doesn't look like it will). The kernel code does not reveal anything to me.
Edit: well I emailed intel for what its worth. heh
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rmcarlsson
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| Posted: Fri Apr 18, 2008 8:18 pm Post subject: |
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Hi,
I am running Window on that machine now and what can you see in Windows? I bought an AMD64 based machine for my Gentoo box instead of using the E6300 machine, mainly due to the limited EIST.
I do not recall the exact fequencies, sorry, only that it they were in the region of 1.86 and 1.6x something.
/ Mikael |
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