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Kernel-Power/Thermal-Operaional events in System Event Viewer.

post #1 of 6
Thread Starter 
I just recently discovered this category of events in win7s "Event Viewer". I'm wondering what the collective wisdom of the OCN community knows about it?

My system logs these every now and again. I've got about 480 events going back to mid october of last year. I'm not sure if it started then or if they occurred prior to that and the older events have been pruned from the log. That date coincides with when I discovered prime95 and used it to verify stability when bumping my cpu from 3.4Ghz (how i received it in 2010) to 3.7Ghz just by fiddling with boost multis (no changes to voltages or bclk).

They come in spurts or 3 or 4 with the event being generated for multiple cores at the same time, but not necessarily all of the cores. I see a about a dozen or so events logged on those days that it did happened. I don't know if these only occur during my prime95 runs. I've since bumped vcore slightly up to reach 3.9Gz, and did testing to verify stability. Also fiddled with new fans and made small changes to enhance cooling... and did testing with prime95 to verify... a quick test for me is 20 minutes, but I let it run for an hour before deciding to keep particular OC settings.

When testing like that (prime95), the hotter cores can get up into the mid 70s, the cooler cores, hi 60s or lo 70s. In actual gaming use the hottest core may touch 61 and the cooler cores, hi 50s. I'm keeping an eye out now for whether these show up in actual use or only when stress testing, but i'm thinking this only occurs when really stress testing.

Anyway, wondering what OCN'ers know about these events?


They show up under...

Event Viewer (Local)
Applications and Service Logs
Microsoft
Windows
Kernel-Power
Thermal-Operational

And a particular event looks like...

Example1: Processor 1 was throttled by an entity other than the kernel power manager.
Example2: Processor 6 was throttled by an entity other than the kernel power manager.

They all have these common properties...

IA32_CLOCK_MODULATION MSR = 0x2.
Elapsed time since last event logged = 0s.
Log interval = 1000 events.
EventID: 91
Task Category: (88)
Level: Warning
Keywords: (32)
OpCode: Info
Falcon2010
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Falcon2010
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post #2 of 6
Do you ever use RealTemp?

IA32_CLOCK_MODULATION MSR is the CPU register that keeps track of clock modulation throttling which is a method that can be used to slow down your CPU. Clock modulation throttling was a big problem for many laptops so RealTemp makes sure this register is set to a safe value so your CPU can run at full speed.

This was fully explained a while ago on Overclock.net along with an excellent example why software should check all threads of your CPU to make sure all threads are running at 100%. If you find that information useful, maybe give that thread a bump so other users can find it.

http://www.overclock.net/t/1310942/core-temp-or-realtemp-for-ivy-bridge#post_18294966
post #3 of 6
Thread Starter 
Yes, I use RealTemp v3.70, that's what i use to monitor temps while stress testing. Thanx you so much for the pointer to the old thread. I'll do some reading up over there and probably do some bumping of that thread with my questions and such.
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Falcon2010
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post #4 of 6
Thread Starter 
I see... RealTemp3.70 is fiddling that registry register value which causes those events to be generated, so the presence of those events in the log is not indicative of throttling having occurred at all.
Edited by michael-ocn - 4/17/13 at 5:29pm
Falcon2010
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Falcon2010
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AudioAudio
Sennheiser PX100 headphones AntLion ModMic v4 
CPUMotherboardGraphicsRAM
i7-5820k | core@4.4 1.23v | cache@4.1 1.1v ASUS X99-PRO / USB 3.1 EVGA GTX 980ti FTW Crucial Ballistix Sport 2400 CL12 (4 x 4GB) 
Hard DriveHard DriveHard DriveOptical Drive
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post #5 of 6
RealTemp does not write any values to the Windows Registry.

RealTemp only reads and writes values directly to registers within the CPU. Windows monitors this register in the CPU and if it detects any changes, it records that as throttling whether the CPU is throttling or not.

Software has to write a value of at least 0x10 to throttle the CPU. Any values less than this such as 0x2 means that clock modulation throttling is being disabled, not enabled.
post #6 of 6
Thread Starter 
yeah... sorry meant that register value smile.gif Looks like its setting the amount to modulate by to 12.5% when modulation is activated (by some other party at a later time).
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CPUMotherboardGraphicsRAM
i7-875K ASUS P7P55D-E-PRO EVGA GTX 670 FTW Crucial Ballistix Tactical 
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Western Digital Caviar Black Crucial M500 SSD  LG Blu-ray Combo Drive Asetek 550LC 
CoolingCoolingOSMonitor
Noiseblocker Multiframe M12-P Silverstone Case Fans Windows 7 Home Premium 64bit Samsung 2443 
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Rosewill RK-9000BR Silverstone Strider Plus 750 Silverstone Kublai SteelSeries Sensei [RAW] 
AudioAudio
Sennheiser PX100 headphones AntLion ModMic v4 
CPUMotherboardGraphicsRAM
i7-5820k | core@4.4 1.23v | cache@4.1 1.1v ASUS X99-PRO / USB 3.1 EVGA GTX 980ti FTW Crucial Ballistix Sport 2400 CL12 (4 x 4GB) 
Hard DriveHard DriveHard DriveOptical Drive
Crucial MX200 (1 TB) Crucial M500 (960 GB) Western Digital Green (2 TB) Pioneer BDR-XU03 
CoolingOSOSMonitor
Swiftech H240-X Win 10 Pro (64 bit) Linux Mint 17 Cinnamon Asus ROG Swift PG279Q 
KeyboardPowerCaseMouse
Rosewill RK-9000BR Silverstone Strider Gold 850 Phanteks Enthoo EVOLV ATX (gray) SteelSeries Sensei [RAW] 
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Gamedias NYX Mousepad 350x280 Grado SR80e Lexar Professional Workflow SR2 SDHC/SDXC UHS-I... 
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Falcon2010
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Kickass-X99
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CPUMotherboardGraphicsRAM
i7-875K ASUS P7P55D-E-PRO EVGA GTX 670 FTW Crucial Ballistix Tactical 
Hard DriveHard DriveOptical DriveCooling
Western Digital Caviar Black Crucial M500 SSD  LG Blu-ray Combo Drive Asetek 550LC 
CoolingCoolingOSMonitor
Noiseblocker Multiframe M12-P Silverstone Case Fans Windows 7 Home Premium 64bit Samsung 2443 
KeyboardPowerCaseMouse
Rosewill RK-9000BR Silverstone Strider Plus 750 Silverstone Kublai SteelSeries Sensei [RAW] 
AudioAudio
Sennheiser PX100 headphones AntLion ModMic v4 
CPUMotherboardGraphicsRAM
i7-5820k | core@4.4 1.23v | cache@4.1 1.1v ASUS X99-PRO / USB 3.1 EVGA GTX 980ti FTW Crucial Ballistix Sport 2400 CL12 (4 x 4GB) 
Hard DriveHard DriveHard DriveOptical Drive
Crucial MX200 (1 TB) Crucial M500 (960 GB) Western Digital Green (2 TB) Pioneer BDR-XU03 
CoolingOSOSMonitor
Swiftech H240-X Win 10 Pro (64 bit) Linux Mint 17 Cinnamon Asus ROG Swift PG279Q 
KeyboardPowerCaseMouse
Rosewill RK-9000BR Silverstone Strider Gold 850 Phanteks Enthoo EVOLV ATX (gray) SteelSeries Sensei [RAW] 
Mouse PadAudioOther
Gamedias NYX Mousepad 350x280 Grado SR80e Lexar Professional Workflow SR2 SDHC/SDXC UHS-I... 
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