Opened 13 years ago
Closed 12 years ago
#8445 closed enhancement (fixed)
x86: Initialize IA32_MSR_ENERGY_PERF_BIAS
| Reported by: | yongcong | Owned by: | yongcong |
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| Priority: | normal | Milestone: | R1 |
| Component: | System/Kernel | Version: | R1/alpha3 |
| Keywords: | gsoc2012 | Cc: | |
| Blocked By: | Blocking: | ||
| Platform: | All |
Description
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
Attachments (2)
Change History (7)
by , 13 years ago
| Attachment: | 0002-x86-Initialize-IA32_MSR_ENERGY_PERF_BIAS.patch added |
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comment:1 by , 13 years ago
| patch: | 0 → 1 |
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comment:2 by , 13 years ago
| Keywords: | gsoc2012 added |
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by , 13 years ago
| Attachment: | 0002-x86-Initialize-IA32_MSR_ENERGY_PERF_BIAS.2.patch added |
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comment:3 by , 13 years ago
comment:4 by , 12 years ago
| Owner: | changed from to |
|---|---|
| Status: | new → assigned |
comment:5 by , 12 years ago
| Resolution: | → fixed |
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| Status: | assigned → closed |
I must have missed this bug, this was applied in hrev44590.
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rebase and resend the patch. Thanks