[haiku-bugs] [Haiku] #8445: x86: Initialize IA32_MSR_ENERGY_PERF_BIAS

  • From: "yongcong" <trac@xxxxxxxxxxxx>
  • Date: Tue, 03 Apr 2012 16:31:22 -0000

#8445: x86: Initialize IA32_MSR_ENERGY_PERF_BIAS
 Reporter:  yongcong       |        Owner:  axeld
     Type:  enhancement    |       Status:  new
 Priority:  normal         |    Milestone:  R1
Component:  System/Kernel  |      Version:  R1/alpha3
 Keywords:                 |   Blocked By:
 Blocking:                 |  Has a Patch:  0
 Platform:  All            |
 The lowest 4 bits of the MSR serves as a hint to the hardware to
 favor performance or energy saving. 0 means a hint preference for
 highest performance while 15 corresponds to the maximum energy
 savings. A value of 7 translates into a hint to balance performance
 with energy savings.

 The default reset value of the MSR is 0. If BIOS doesn't intialize
 the MSR, the hardware will run in performance state. This patch
 initialize the MSR with value of 7 for balance between performance
 and energy savings

Ticket URL: <http://dev.haiku-os.org/ticket/8445>
Haiku <http://dev.haiku-os.org>
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