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I need to know about the IA32_MSR_PERF_STATUS and how to translate the vid values into real voltages.
Where can I find that information?
Thank you for your time :)
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MSR information can be found in Appendix B of the processor manual set at
http://developer.intel.com/products/processor/manuals/index.htm
VID information can found in the data sheet of specific processors. A word of caution, the VID interface can change with processor stepping, they are also different across product segment. Therefore they were defined with BIOS in mind as the intended usage.
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You are wrong twice.
1. "MSR information can be found in Appendix B" - there are no VID information
2. "VID information can found in the data sheet of specific processors" - there are no any datasheet for Intel Core 2 Duo T8300.
Is it a secret information?
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Hi,
Shihjong is right, only think he forgot to mention the spec name. MSRs are defined in appendix B.1 of 3B.
http://developer.intel.com/Assets/PDF/manual/253669.pdf
Another thing the name of the MSR is IA32_PERF_STATUS
VID information can be found after selecting the processor and the corresponding document. Here is another document with VID values for multiple processors:
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I alreay read 253669 as well as 253668. There are no VID information forIA32_PERF_STATUS=0x198
Appendix B1, table B-2, page 650, table B-3 page 687
About 322172.pdf
T8300 didn't found
MSR didn't found
IA32_PERF didn't found
Yes, I found VID-Voltage table for T7500 but I still has no information about VID inIA32_PERF_STATUS
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I thought you have two questions:
1. One was documentation regarding MSR as I said us explained in 253669 apendix B.
2. Second was documentation for VID.
VID documentaion is in datasheet for each processor. Please check this document for 7000-8500 desktop series (E8500):
http://download.intel.com/design/processor/datashts/318732.pdf
For Mobile parts:
http://download.intel.com/design/mobile/datashts/31674505.pdf
It looks like you are trying to do speed stepping. There are a few whitepapers on this subject on Intel website. One is for Linux OS:
if you dont find it, just google speed step intel .... there is plenty of information.
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I see somemisunderstanding
There is no any VID information in the bit fields.
I also read 31674505. There is no T8300 processor. OK, I can suppose that it is the same as T7700. Is it true?
Thank you for the link on Linux article while there ia no such information.
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I understand that you do not want to open this information
The current
operating point can be read from IA32_PERF_STATUS. IA32_PERF_STATUS is
updated dynamically.
The 16-bit encoding that defines valid operating points is model-specific. Applications
and performance tools are not expected to use either IA32_PERF_CTL or
IA32_PERF_STATUS and should treat both as reserved.
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