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Bug #2828

open

On AMD APUs and Bulldozer CPUs, the machdep.cpu_idle_hlt sysctl should be 3 by default

Added by vadaszi about 7 years ago. Updated about 1 year ago.

Status:
New
Priority:
High
Assignee:
Category:
Kernel
Target version:
Start date:
06/13/2015
Due date:
% Done:

0%

Estimated time:

Description

Power usage of a default install is unnecessarily high on current AMD CPUs. Setting the default value of the machdep.cpu_idle_hlt sysctl on these CPUs to 3 by default allows for significant power savings.

I'm not sure how setting machdep.cpu_idle_hlt=3 affects power usage on AMD Family 10h CPUs (e.g. Phenom CPUs).

Some quick benchmarking should be done if possible, to compare the performance difference.

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