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  1. Bug #331691
  2. Comment #4

Comment 4 for bug 331691

Revision history for this message
Kyle Jones (mutiny32) wrote :

Looks like this has been fixed in Kernel 2.6.29-RC5:

commit 732553e567c2700ba5b9bccc6ec885c75779a94b
Author: Mark Langsdorf <email address hidden>
Date: Tue Feb 3 17:46:43 2009 +0100

    [CPUFREQ] powernow-k8: Get transition latency from ACPI _PSS table

    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.

    Signed-off-by: Mark Langsdorf <email address hidden>
    Signed-off-by: Thomas Renninger <email address hidden>
    Signed-off-by: Dave Jones <email address hidden>