diff options
| author | Krzysztof Helt <krzysztof.h1@wp.pl> | 2009-10-25 19:45:57 +0100 |
|---|---|---|
| committer | Willy Tarreau <w@1wt.eu> | 2014-05-19 07:54:25 +0200 |
| commit | 9d73a68445d6a36c9fabd96906663c5db4a685ff (patch) | |
| tree | ad70deb24436313e3048bdbacd68052928010b6c | |
| parent | 3ae3f8b7150ecde872a4a033127218f43c75d4b6 (diff) | |
powernow-k6: set transition latency value so ondemand governor can be used
Set the transition latency to value smaller than CPUFREQ_ETERNAL so
governors other than "performance" work (like the "ondemand" one).
The value is found in "AMD PowerNow! Technology Platform Design Guide for
Embedded Processors" dated December 2000 (AMD doc #24267A). There is the
answer to one of FAQs on page 40 which states that suggested complete transition
period is 200 us.
Tested on K6-2+ CPU with K6-3 core (model 13, stepping 4).
Signed-off-by: Krzysztof Helt <krzysztof.h1@wp.pl>
Signed-off-by: Dave Jones <davej@redhat.com>
(cherry picked from commit db2820dd5445a44b4726f15a2bc89b9ded2503eb)
[wt: in 2.6.32, we only need this one so that next series applies cleanly]
Signed-off-by: Willy Tarreau <w@1wt.eu>
| -rw-r--r-- | arch/x86/kernel/cpu/cpufreq/powernow-k6.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/kernel/cpu/cpufreq/powernow-k6.c b/arch/x86/kernel/cpu/cpufreq/powernow-k6.c index f10dea409f40..cb01dac267d3 100644 --- a/arch/x86/kernel/cpu/cpufreq/powernow-k6.c +++ b/arch/x86/kernel/cpu/cpufreq/powernow-k6.c @@ -164,7 +164,7 @@ static int powernow_k6_cpu_init(struct cpufreq_policy *policy) } /* cpuinfo and default policy values */ - policy->cpuinfo.transition_latency = CPUFREQ_ETERNAL; + policy->cpuinfo.transition_latency = 200000; policy->cur = busfreq * max_multiplier; result = cpufreq_frequency_table_cpuinfo(policy, clock_ratio); |