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[Bug 1519646] Re: [bug] turbostat reports understated Avg_MHz and %Busy on Knights Landing

To: kernel-packages@xxxxxxxxxxxxxxxxxxx
From: Leann Ogasawara <leann.ogasawara@xxxxxxxxxxxxx>
Date: Thu, 17 Mar 2016 20:00:31 -0000
Reply-to: Bug 1519646 <1519646@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

** Information type changed from Proprietary to Public

** Also affects: linux (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: linux (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Changed in: linux (Ubuntu Xenial)
       Status: New => Fix Released

** Changed in: intel
       Status: New => Fix Released

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https://bugs.launchpad.net/bugs/1519646

Title:
  [bug] turbostat reports understated Avg_MHz and %Busy on Knights
  Landing

Status in intel:
  Fix Released
Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Xenial:
  Fix Released

Bug description:
  turbostat reports understated Avg_MHz and %Busy on Knights Laading due to fact that APERF/MPERF are incremented every 1024 clocks, while turbostat assumes that APERF/MPERF are incremented on each clock.
  Fix is to add multiplier for APERF/MPERF.

  Platform: KNL

  This is fixed in 4.3 kernel with:
  b2b34df tools/power turbostat: KNL workaround for %Busy and Avg_MHz

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