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