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    MSR_CORE_PERF_LIMIT_REASONS

    I supposed they were under NDA, I've found anything the net. I've written a small reporting program and made some testing: it seems the MSRs descriptions in the public documents are correct. Bye!
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    MSR_CORE_PERF_LIMIT_REASONS

    Thanks! Can you write me which other documents refer to these msrs? So I can cross-check them, at least in regard to Temp, Current and TDP limits.
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    MSR_CORE_PERF_LIMIT_REASONS

    Hi Martin, it seems Intel recently updated MSRs docs (page 35-142) about Haswell (and Broadwell): they've added three very interesting MSRs that show the exact reason(s) why CPU, GPU or Uncore are slowed down in real-time. (like PROCHOT, Thermal, Graphics driver, Low Utilization, VRM Therm...
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    DPC latency spikes and audio glitches fix

    i7-4750HQ Bus Clock Based enabled cause one only one spike on startup, adding Periodic cause spikes on each update, disabling Bus Clock Based remove all of them (even leaving periodic on). This seems to happens only during video playing, so I think there's some conflict with an hardware timer...
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    DPC latency spikes and audio glitches fix

    Absolutely sure. Hwinfo can't read EC on this laptop, and I tested disabling / re-enabling each sensor monitor to be sure: it's only caused by the clock polling. During heavy CPU load it can cause usb audio to mute for 1-2 seconds. How you're reading it exactly, comparing QueryPerformanceCounter...
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    DPC latency spikes and audio glitches fix

    Hi Martin, I've found HWinfo sensor monitoring is causing audio/video glitches (from DPC latency spikes) on some Haswell mobile cpus under load. Fortunately disabling Periodic polling of Bus Clock completely fixed them. I think it should be disabled by default (poll only on startup): people...
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