Messages in this thread | | | Date | Sun, 08 Feb 2009 12:35:52 -0600 | From | Robert Hancock <> | Subject | Re: [PATCH 4/7] CPUFREQ: powernow-k8: Get transition latency from ACPI _PSS table |
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Thomas Renninger wrote: > From: Mark Langsdorf <mark.langsdorf@amd.com> > > 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 <mark.langsdorf@amd.com> > Signed-off-by: Thomas Renninger <trenn@suse.de> > --- > arch/x86/kernel/cpu/cpufreq/powernow-k8.c | 28 ++++++++++++++++++++++------ > 1 files changed, 22 insertions(+), 6 deletions(-)
Hopefully somebody is pushing this for .29? This seems to make a big difference in system responsiveness on my Athlon X2 system.
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