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    • Jacob Pan's avatar
      powercap / RAPL: handle domains with different energy units · d474a4d3
      Jacob Pan authored
      The current driver assumes all RAPL domains within a CPU package
      have the same energy unit. This is no longer true for HSW server
      CPUs since DRAM domain has is own fixed energy unit which can be
      different than the package energy unit enumerated by package
      power MSR. In fact, the default HSW EP package power unit is 61uJ
      whereas DRAM domain unit is 15.3uJ. The result is that DRAM power
      consumption is counted 4x more than real power reported by energy
      counters, similarly for max_energy_range_uj of DRAM domain.
      
      This patch adds domain specific energy unit per cpu type, it allows
      domain energy unit to override package energy unit if non zero.
      
      Please see this document for details.
      "Intel Xeon Processor E5-1600 and E5-2600 v3 Product Families, Volume 2 of 2.
       Datasheet, September 2014, Reference Number: 330784-001 "
      Signed-off-by: default avatarJacob Pan <jacob.jun.pan@linux.intel.com>
      Cc: 3.10+ <stable@vger.kernel.org> # 3.10+
      Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
      d474a4d3
  28. 17 Dec, 2014 1 commit
  29. 12 Nov, 2014 1 commit