On Tue, 27 Jan 2009 14:03:47 -0600
Mark Langsdorf <mark.langsdorf@xxxxxxx> wrote:
> Subject: [PATCH] Determine latency from ACPI
Nobody who reads this title will have a clue which subsystem the patch
affects. Please always create patch titles of the form:
subsystem-identifer: what-i-changed
> At this time, the PowerNow! driver for K8 uses an experimentally
> derived formula to calculate transition latency. The value it
> provides is orders of magnitude too large on modern systems.
> This patch replaces the formula with ACPI _PSS latency values
> for more accuracy and better performance.
>
> I've tested it on two 2nd generation Opteron systems, a 3rd
> generation Operton system, and a Turion X2 without seeing any
> stability problems.
>
There are a tremendous number of changes to this file in linux-next.
It's easy to make the patch apply, but my confidence that the result
will actually work is insufficiently high.
Also, I notice that linux-next's
commit 8ad2aedc2129f4e791dc7e2e89eabdcb2145d16c
Author: Dave Jones <davej@xxxxxxxxxx>
AuthorDate: Sun Jan 18 01:22:33 2009 -0500
Commit: Dave Jones <davej@xxxxxxxxxx>
CommitDate: Fri Jan 23 09:27:06 2009 -0500
[CPUFREQ] checkpatch cleanups for powernow-k8
broke the layout of powernow_k8_acpi_pst_values() most unpleasantly
(the closing brace).
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