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| author | Dirk Brandewie <dirk.j.brandewie@intel.com> | 2013-07-18 08:48:42 -0700 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2013-07-23 04:18:28 +0200 |
| commit | 2134ed4d614349b2b4e8d7bb593baa9179b8dd1e (patch) | |
| tree | 044cff8a3f4c619bfd077ebaa65a1ae2693d47e4 /drivers/cpufreq/intel_pstate.c | |
| parent | 3b2f64d00c46e1e4e9bd0bb9bb12619adac27a4b (diff) | |
| download | lwn-2134ed4d614349b2b4e8d7bb593baa9179b8dd1e.tar.gz lwn-2134ed4d614349b2b4e8d7bb593baa9179b8dd1e.zip | |
cpufreq / intel_pstate: Change to scale off of max P-state
Change to using max P-state instead of max turbo P-state. This
change resolves two issues.
On a quiet system intel_pstate can fail to respond to a load change.
On CPU SKUs that have a limited number of P-states and no turbo range
intel_pstate fails to select the highest available P-state.
This change is suitable for stable v3.9+
References: https://bugzilla.kernel.org/show_bug.cgi?id=59481
Reported-and-tested-by: Arjan van de Ven <arjan@linux.intel.com>
Reported-and-tested-by: dsmythies@telus.net
Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Cc: 3.9+ <stable@vger.kernel.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/cpufreq/intel_pstate.c')
| -rw-r--r-- | drivers/cpufreq/intel_pstate.c | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c index b012d7600e1a..7cde885011ed 100644 --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -103,10 +103,10 @@ struct pstate_adjust_policy { static struct pstate_adjust_policy default_policy = { .sample_rate_ms = 10, .deadband = 0, - .setpoint = 109, - .p_gain_pct = 17, + .setpoint = 97, + .p_gain_pct = 20, .d_gain_pct = 0, - .i_gain_pct = 4, + .i_gain_pct = 0, }; struct perf_limits { @@ -468,12 +468,12 @@ static inline void intel_pstate_set_sample_time(struct cpudata *cpu) static inline int intel_pstate_get_scaled_busy(struct cpudata *cpu) { int32_t busy_scaled; - int32_t core_busy, turbo_pstate, current_pstate; + int32_t core_busy, max_pstate, current_pstate; core_busy = int_tofp(cpu->samples[cpu->sample_ptr].core_pct_busy); - turbo_pstate = int_tofp(cpu->pstate.turbo_pstate); + max_pstate = int_tofp(cpu->pstate.max_pstate); current_pstate = int_tofp(cpu->pstate.current_pstate); - busy_scaled = mul_fp(core_busy, div_fp(turbo_pstate, current_pstate)); + busy_scaled = mul_fp(core_busy, div_fp(max_pstate, current_pstate)); return fp_toint(busy_scaled); } |