[PATCH] Revert "cpufreq: intel_pstate: Fix ->set_policy() interface for no_turbo"

[PATCH] Revert "cpufreq: intel_pstate: Fix ->set_policy() interface for no_turbo"

[Gabriele Mazzotta]

This change does not take into account that some BIOSes change
MSR_IA32_MISC_ENABLE_TURBO_DISABLE depending on the power source.
If the turbo is disabled when the system boots, policy.max_freq
is set to pstate.max_pstate. However, if the BIOS later enables
the turbo, the CPU will never be able to run at pstate.turbo_pstate.

Since now intel_pstate_set_policy() does its calculations using
pstate.max_freq and pstate.turbo_freq, we can always calculate
cpuinfo.max_freq using pstate.turbo_pstate, thus allowing system
with varying MSR_IA32_MISC_ENABLE_TURBO_DISABLE to run at full
speed when the turbo is enabled.

This reverts commit 983e600e88835f0321d1a0ea06f52d48b7b5a544.

Signed-off-by: Gabriele Mazzotta <gabriele.mzt@gmail.com>
---
 drivers/cpufreq/intel_pstate.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
index 3c3971256130..4043aae2d611 100644
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -2068,9 +2068,8 @@ static int __intel_pstate_cpu_init(struct cpufreq_policy *policy)
 	/* cpuinfo and default policy values */
 	policy->cpuinfo.min_freq = cpu->pstate.min_pstate * cpu->pstate.scaling;
 	update_turbo_state();
-	policy->cpuinfo.max_freq = global.turbo_disabled ?
-			cpu->pstate.max_pstate : cpu->pstate.turbo_pstate;
-	policy->cpuinfo.max_freq *= cpu->pstate.scaling;
+	policy->cpuinfo.max_freq =
+		cpu->pstate.turbo_pstate * cpu->pstate.scaling;
 
 	intel_pstate_init_acpi_perf_limits(policy);
 
-- 
2.18.0

Re: [PATCH] Revert "cpufreq: intel_pstate: Fix ->set_policy() interface for no_turbo"

[Gabriele Mazzotta]

On 04/08/2018 17:29, Gabriele Mazzotta wrote:
> This change does not take into account that some BIOSes change
> MSR_IA32_MISC_ENABLE_TURBO_DISABLE depending on the power source.
> If the turbo is disabled when the system boots, policy.max_freq
> is set to pstate.max_pstate. However, if the BIOS later enables
> the turbo, the CPU will never be able to run at pstate.turbo_pstate.
> 
> Since now intel_pstate_set_policy() does its calculations using
> pstate.max_freq and pstate.turbo_freq, we can always calculate
> cpuinfo.max_freq using pstate.turbo_pstate, thus allowing system
> with varying MSR_IA32_MISC_ENABLE_TURBO_DISABLE to run at full
> speed when the turbo is enabled.
> 
> This reverts commit 983e600e88835f0321d1a0ea06f52d48b7b5a544.
> 
> Signed-off-by: Gabriele Mazzotta <gabriele.mzt@gmail.com>
> ---
>  drivers/cpufreq/intel_pstate.c | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
> index 3c3971256130..4043aae2d611 100644
> --- a/drivers/cpufreq/intel_pstate.c
> +++ b/drivers/cpufreq/intel_pstate.c
> @@ -2068,9 +2068,8 @@ static int __intel_pstate_cpu_init(struct cpufreq_policy *policy)
>  	/* cpuinfo and default policy values */
>  	policy->cpuinfo.min_freq = cpu->pstate.min_pstate * cpu->pstate.scaling;
>  	update_turbo_state();

Commit 983e600e8883 added this update_turbo_state() call, but it is
needed by intel_pstate_init_acpi_perf_limits() here below. I should
have mentioned it in the commit message.

However, I've just realized that a similar problem to that I'm trying
to fix can occur on those systems where core_frequency is adjusted
depending on the availability of the turbo.

The call to update_turbo_state() could also be moved in
intel_pstate_init_acpi_perf_limits(), right before the check on
global.turbo_disabled.

> -	policy->cpuinfo.max_freq = global.turbo_disabled ?
> -			cpu->pstate.max_pstate : cpu->pstate.turbo_pstate;
> -	policy->cpuinfo.max_freq *= cpu->pstate.scaling;
> +	policy->cpuinfo.max_freq =
> +		cpu->pstate.turbo_pstate * cpu->pstate.scaling;
>  
>  	intel_pstate_init_acpi_perf_limits(policy);
>  
> 

Re: [PATCH] Revert "cpufreq: intel_pstate: Fix ->set_policy() interface for no_turbo"

[Rafael J. Wysocki]

On Sat, Aug 4, 2018 at 7:31 PM, Gabriele Mazzotta
<gabriele.mzt@gmail.com> wrote:
> On 04/08/2018 17:29, Gabriele Mazzotta wrote:
>> This change does not take into account that some BIOSes change
>> MSR_IA32_MISC_ENABLE_TURBO_DISABLE depending on the power source.
>> If the turbo is disabled when the system boots, policy.max_freq
>> is set to pstate.max_pstate. However, if the BIOS later enables
>> the turbo, the CPU will never be able to run at pstate.turbo_pstate.
>>
>> Since now intel_pstate_set_policy() does its calculations using
>> pstate.max_freq and pstate.turbo_freq, we can always calculate
>> cpuinfo.max_freq using pstate.turbo_pstate, thus allowing system
>> with varying MSR_IA32_MISC_ENABLE_TURBO_DISABLE to run at full
>> speed when the turbo is enabled.

Well, the problem with this approach is that always using
pstate.turbo_pstate as the max causes the governor to overestimate the
target frequency when the turbo range is not available (the target
depends on the width of the entire available P-state range including
turbo, so if the turbo range is not available, the number take into
that computation is too large).

Are we expected to get notified when the BIOS updates
MSR_IA32_MISC_ENABLE_TURBO_DISABLE?

Re: [PATCH] Revert "cpufreq: intel_pstate: Fix ->set_policy() interface for no_turbo"

[Srinivas Pandruvada]

On Mon, 2018-08-06 at 10:30 +0200, Rafael J. Wysocki wrote:
> On Sat, Aug 4, 2018 at 7:31 PM, Gabriele Mazzotta
> <gabriele.mzt@gmail.com> wrote:
> > On 04/08/2018 17:29, Gabriele Mazzotta wrote:
> > > This change does not take into account that some BIOSes change
> > > MSR_IA32_MISC_ENABLE_TURBO_DISABLE depending on the power source.
> > > If the turbo is disabled when the system boots, policy.max_freq
> > > is set to pstate.max_pstate. However, if the BIOS later enables
> > > the turbo, the CPU will never be able to run at
> > > pstate.turbo_pstate.
> > > 
> > > Since now intel_pstate_set_policy() does its calculations using
> > > pstate.max_freq and pstate.turbo_freq, we can always calculate
> > > cpuinfo.max_freq using pstate.turbo_pstate, thus allowing system
> > > with varying MSR_IA32_MISC_ENABLE_TURBO_DISABLE to run at full
> > > speed when the turbo is enabled.
> 
> Well, the problem with this approach is that always using
> pstate.turbo_pstate as the max causes the governor to overestimate
> the
> target frequency when the turbo range is not available (the target
> depends on the width of the entire available P-state range including
> turbo, so if the turbo range is not available, the number take into
> that computation is too large).
> 
> Are we expected to get notified when the BIOS updates
> MSR_IA32_MISC_ENABLE_TURBO_DISABLE?

Let's try this:
- boot with kernel command line 

intel_pstate=support_acpi_ppc dyndbg="file processor_perflib.c +p"
dyndbg="file intel_pstate.c +p"

and send dmesg after you change power sources.

- Also try with
intel_pstate=disable dyndbg="file processor_perflib.c +p"

and send dmesg.

Thanks,
Srinivas

Re: [PATCH] Revert "cpufreq: intel_pstate: Fix ->set_policy() interface for no_turbo"

[Gabriele Mazzotta]

On 06/08/2018 18:49, Srinivas Pandruvada wrote:
> On Mon, 2018-08-06 at 10:30 +0200, Rafael J. Wysocki wrote:
>> On Sat, Aug 4, 2018 at 7:31 PM, Gabriele Mazzotta
>> <gabriele.mzt@gmail.com> wrote:
>>> On 04/08/2018 17:29, Gabriele Mazzotta wrote:
>>>> This change does not take into account that some BIOSes change
>>>> MSR_IA32_MISC_ENABLE_TURBO_DISABLE depending on the power source.
>>>> If the turbo is disabled when the system boots, policy.max_freq
>>>> is set to pstate.max_pstate. However, if the BIOS later enables
>>>> the turbo, the CPU will never be able to run at
>>>> pstate.turbo_pstate.
>>>>
>>>> Since now intel_pstate_set_policy() does its calculations using
>>>> pstate.max_freq and pstate.turbo_freq, we can always calculate
>>>> cpuinfo.max_freq using pstate.turbo_pstate, thus allowing system
>>>> with varying MSR_IA32_MISC_ENABLE_TURBO_DISABLE to run at full
>>>> speed when the turbo is enabled.
>>
>> Well, the problem with this approach is that always using
>> pstate.turbo_pstate as the max causes the governor to overestimate
>> the
>> target frequency when the turbo range is not available (the target
>> depends on the width of the entire available P-state range including
>> turbo, so if the turbo range is not available, the number take into
>> that computation is too large).
>>
>> Are we expected to get notified when the BIOS updates
>> MSR_IA32_MISC_ENABLE_TURBO_DISABLE?
> 
> Let's try this:
> - boot with kernel command line 
> 
> intel_pstate=support_acpi_ppc dyndbg="file processor_perflib.c +p"
> dyndbg="file intel_pstate.c +p"

Plugged -> Unplugged:

[   40.046116] CPU 0: _PPC is 6 - frequency  limited
[   40.046128] intel_pstate: policy->max > max non turbo frequency
[   40.046131] intel_pstate: set_policy cpuinfo.max 3000000 policy->max 3000000
[   40.046134] intel_pstate: cpu:0 max_state 30 min_policy_perf:8 max_policy_perf:30
[   40.046137] intel_pstate: cpu:0 global_min:8 global_max:30
[   40.046140] intel_pstate: cpu:0 max_perf_ratio:30 min_perf_ratio:8
[   40.162173] CPU 0: _PPC is 6 - frequency  limited
[   40.162186] intel_pstate: policy->max > max non turbo frequency
[   40.162190] intel_pstate: set_policy cpuinfo.max 3000000 policy->max 3000000
[   40.162194] intel_pstate: cpu:0 max_state 30 min_policy_perf:8 max_policy_perf:30
[   40.162197] intel_pstate: cpu:0 global_min:8 global_max:30
[   40.162200] intel_pstate: cpu:0 max_perf_ratio:30 min_perf_ratio:8
[   40.162215] CPU 0: _PPC is 6 - frequency  limited
[   40.162220] intel_pstate: policy->max > max non turbo frequency
[   40.162223] intel_pstate: set_policy cpuinfo.max 3000000 policy->max 3000000
[   40.162226] intel_pstate: cpu:0 max_state 30 min_policy_perf:8 max_policy_perf:30
[   40.162228] intel_pstate: cpu:0 global_min:8 global_max:30
[   40.162230] intel_pstate: cpu:0 max_perf_ratio:30 min_perf_ratio:8
[   40.162237] CPU 0: _PPC is 6 - frequency  limited
[   40.162241] intel_pstate: policy->max > max non turbo frequency
[   40.162243] intel_pstate: set_policy cpuinfo.max 3000000 policy->max 3000000
[   40.162245] intel_pstate: cpu:0 max_state 30 min_policy_perf:8 max_policy_perf:30
[   40.162247] intel_pstate: cpu:0 global_min:8 global_max:30
[   40.162249] intel_pstate: cpu:0 max_perf_ratio:30 min_perf_ratio:8
[   40.162257] CPU 0: _PPC is 6 - frequency  limited
[   40.162261] intel_pstate: policy->max > max non turbo frequency
[   40.162263] intel_pstate: set_policy cpuinfo.max 3000000 policy->max 3000000
[   40.162265] intel_pstate: cpu:0 max_state 30 min_policy_perf:8 max_policy_perf:30
[   40.162267] intel_pstate: cpu:0 global_min:8 global_max:30
[   40.162269] intel_pstate: cpu:0 max_perf_ratio:30 min_perf_ratio:8

Unplugged -> Plugged:

[   52.648535] CPU 0: _PPC is 6 - frequency  limited
[   52.648553] intel_pstate: set_policy cpuinfo.max 3000000 policy->max 1700000
[   52.648558] intel_pstate: cpu:0 max_state 17 min_policy_perf:8 max_policy_perf:17
[   52.648562] intel_pstate: cpu:0 global_min:8 global_max:30
[   52.648566] intel_pstate: cpu:0 max_perf_ratio:17 min_perf_ratio:8
[   52.648583] CPU 0: _PPC is 6 - frequency  limited
[   52.648590] intel_pstate: set_policy cpuinfo.max 3000000 policy->max 1700000
[   52.648595] intel_pstate: cpu:0 max_state 17 min_policy_perf:8 max_policy_perf:17
[   52.648598] intel_pstate: cpu:0 global_min:8 global_max:30
[   52.648602] intel_pstate: cpu:0 max_perf_ratio:17 min_perf_ratio:8
[   52.656093] CPU 0: _PPC is 6 - frequency  limited
[   52.656111] intel_pstate: set_policy cpuinfo.max 3000000 policy->max 1700000
[   52.656116] intel_pstate: cpu:0 max_state 17 min_policy_perf:8 max_policy_perf:17
[   52.656120] intel_pstate: cpu:0 global_min:8 global_max:30
[   52.656123] intel_pstate: cpu:0 max_perf_ratio:17 min_perf_ratio:8
[   52.775577] CPU 0: _PPC is 6 - frequency  limited
[   52.775594] intel_pstate: set_policy cpuinfo.max 3000000 policy->max 1700000
[   52.775598] intel_pstate: cpu:0 max_state 17 min_policy_perf:8 max_policy_perf:17
[   52.775601] intel_pstate: cpu:0 global_min:8 global_max:30
[   52.775604] intel_pstate: cpu:0 max_perf_ratio:17 min_perf_ratio:8
[   53.028620] CPU 0: _PPC is 6 - frequency  limited
[   53.028637] intel_pstate: set_policy cpuinfo.max 3000000 policy->max 1700000
[   53.028643] intel_pstate: cpu:0 max_state 17 min_policy_perf:8 max_policy_perf:17
[   53.028647] intel_pstate: cpu:0 global_min:8 global_max:30
[   53.028651] intel_pstate: cpu:0 max_perf_ratio:17 min_perf_ratio:8

> and send dmesg after you change power sources.
> 
> - Also try with
> intel_pstate=disable dyndbg="file processor_perflib.c +p"

Nothing gets printed with this one.

Thanks,
Gabriele

> and send dmesg.
> 
> Thanks,
> Srinivas
> 
> 

Re: [PATCH] Revert "cpufreq: intel_pstate: Fix ->set_policy() interface for no_turbo"

[Srinivas Pandruvada]

On Mon, 2018-08-06 at 23:50 +0200, Gabriele Mazzotta wrote:
> On 06/08/2018 18:49, Srinivas Pandruvada wrote:
> > On Mon, 2018-08-06 at 10:30 +0200, Rafael J. Wysocki wrote:
> > > On Sat, Aug 4, 2018 at 7:31 PM, Gabriele Mazzotta
> > > <gabriele.mzt@gmail.com> wrote:
> > > > On 04/08/2018 17:29, Gabriele Mazzotta wrote:
> > > > > This change does not take into account that some BIOSes
> > > > > change
> > > > > MSR_IA32_MISC_ENABLE_TURBO_DISABLE depending on the power
> > > > > source.
> > > > > If the turbo is disabled when the system boots,
> > > > > policy.max_freq
> > > > > is set to pstate.max_pstate. However, if the BIOS later
> > > > > enables
> > > > > the turbo, the CPU will never be able to run at
> > > > > pstate.turbo_pstate.
> > > > > 
> > > > > Since now intel_pstate_set_policy() does its calculations
> > > > > using
> > > > > pstate.max_freq and pstate.turbo_freq, we can always
> > > > > calculate
> > > > > cpuinfo.max_freq using pstate.turbo_pstate, thus allowing
> > > > > system
> > > > > with varying MSR_IA32_MISC_ENABLE_TURBO_DISABLE to run at
> > > > > full
> > > > > speed when the turbo is enabled.
> > > 
> > > Well, the problem with this approach is that always using
> > > pstate.turbo_pstate as the max causes the governor to
> > > overestimate
> > > the
> > > target frequency when the turbo range is not available (the
> > > target
> > > depends on the width of the entire available P-state range
> > > including
> > > turbo, so if the turbo range is not available, the number take
> > > into
> > > that computation is too large).
> > > 
> > > Are we expected to get notified when the BIOS updates
> > > MSR_IA32_MISC_ENABLE_TURBO_DISABLE?
> > 
> > Let's try this:
> > - boot with kernel command line 
> > 
> > intel_pstate=support_acpi_ppc dyndbg="file processor_perflib.c +p"
> > dyndbg="file intel_pstate.c +p"
> 
Interesting output.
Can you run ?
# turbostat --debug 
in both plugged and unplugged state.

Also output of acpidump?


> Plugged -> Unplugged:
> 
> [   40.046116] CPU 0: _PPC is 6 - frequency  limited
> [   40.046128] intel_pstate: policy->max > max non turbo frequency
> [   40.046131] intel_pstate: set_policy cpuinfo.max 3000000 policy-
> >max 3000000
> [   40.046134] intel_pstate: cpu:0 max_state 30 min_policy_perf:8
> max_policy_perf:30
> [   40.046137] intel_pstate: cpu:0 global_min:8 global_max:30
> [   40.046140] intel_pstate: cpu:0 max_perf_ratio:30 min_perf_ratio:8
> [   40.162173] CPU 0: _PPC is 6 - frequency  limited
> [   40.162186] intel_pstate: policy->max > max non turbo frequency
> [   40.162190] intel_pstate: set_policy cpuinfo.max 3000000 policy-
> >max 3000000
> [   40.162194] intel_pstate: cpu:0 max_state 30 min_policy_perf:8
> max_policy_perf:30
> [   40.162197] intel_pstate: cpu:0 global_min:8 global_max:30
> [   40.162200] intel_pstate: cpu:0 max_perf_ratio:30 min_perf_ratio:8
> [   40.162215] CPU 0: _PPC is 6 - frequency  limited
> [   40.162220] intel_pstate: policy->max > max non turbo frequency
> [   40.162223] intel_pstate: set_policy cpuinfo.max 3000000 policy-
> >max 3000000
> [   40.162226] intel_pstate: cpu:0 max_state 30 min_policy_perf:8
> max_policy_perf:30
> [   40.162228] intel_pstate: cpu:0 global_min:8 global_max:30
> [   40.162230] intel_pstate: cpu:0 max_perf_ratio:30 min_perf_ratio:8
> [   40.162237] CPU 0: _PPC is 6 - frequency  limited
> [   40.162241] intel_pstate: policy->max > max non turbo frequency
> [   40.162243] intel_pstate: set_policy cpuinfo.max 3000000 policy-
> >max 3000000
> [   40.162245] intel_pstate: cpu:0 max_state 30 min_policy_perf:8
> max_policy_perf:30
> [   40.162247] intel_pstate: cpu:0 global_min:8 global_max:30
> [   40.162249] intel_pstate: cpu:0 max_perf_ratio:30 min_perf_ratio:8
> [   40.162257] CPU 0: _PPC is 6 - frequency  limited
> [   40.162261] intel_pstate: policy->max > max non turbo frequency
> [   40.162263] intel_pstate: set_policy cpuinfo.max 3000000 policy-
> >max 3000000
> [   40.162265] intel_pstate: cpu:0 max_state 30 min_policy_perf:8
> max_policy_perf:30
> [   40.162267] intel_pstate: cpu:0 global_min:8 global_max:30
> [   40.162269] intel_pstate: cpu:0 max_perf_ratio:30 min_perf_ratio:8
> 
> Unplugged -> Plugged:
> 
> [   52.648535] CPU 0: _PPC is 6 - frequency  limited
> [   52.648553] intel_pstate: set_policy cpuinfo.max 3000000 policy-
> >max 1700000
> [   52.648558] intel_pstate: cpu:0 max_state 17 min_policy_perf:8
> max_policy_perf:17
> [   52.648562] intel_pstate: cpu:0 global_min:8 global_max:30
> [   52.648566] intel_pstate: cpu:0 max_perf_ratio:17 min_perf_ratio:8
> [   52.648583] CPU 0: _PPC is 6 - frequency  limited
> [   52.648590] intel_pstate: set_policy cpuinfo.max 3000000 policy-
> >max 1700000
> [   52.648595] intel_pstate: cpu:0 max_state 17 min_policy_perf:8
> max_policy_perf:17
> [   52.648598] intel_pstate: cpu:0 global_min:8 global_max:30
> [   52.648602] intel_pstate: cpu:0 max_perf_ratio:17 min_perf_ratio:8
> [   52.656093] CPU 0: _PPC is 6 - frequency  limited
> [   52.656111] intel_pstate: set_policy cpuinfo.max 3000000 policy-
> >max 1700000
> [   52.656116] intel_pstate: cpu:0 max_state 17 min_policy_perf:8
> max_policy_perf:17
> [   52.656120] intel_pstate: cpu:0 global_min:8 global_max:30
> [   52.656123] intel_pstate: cpu:0 max_perf_ratio:17 min_perf_ratio:8
> [   52.775577] CPU 0: _PPC is 6 - frequency  limited
> [   52.775594] intel_pstate: set_policy cpuinfo.max 3000000 policy-
> >max 1700000
> [   52.775598] intel_pstate: cpu:0 max_state 17 min_policy_perf:8
> max_policy_perf:17
> [   52.775601] intel_pstate: cpu:0 global_min:8 global_max:30
> [   52.775604] intel_pstate: cpu:0 max_perf_ratio:17 min_perf_ratio:8
> [   53.028620] CPU 0: _PPC is 6 - frequency  limited
> [   53.028637] intel_pstate: set_policy cpuinfo.max 3000000 policy-
> >max 1700000
> [   53.028643] intel_pstate: cpu:0 max_state 17 min_policy_perf:8
> max_policy_perf:17
> [   53.028647] intel_pstate: cpu:0 global_min:8 global_max:30
> [   53.028651] intel_pstate: cpu:0 max_perf_ratio:17 min_perf_ratio:8
> 
> > and send dmesg after you change power sources.
> > 
> > - Also try with
> > intel_pstate=disable dyndbg="file processor_perflib.c +p"
> 
> Nothing gets printed with this one.
> 
> Thanks,
> Gabriele
> 
> > and send dmesg.
> > 
> > Thanks,
> > Srinivas
> > 
> > 

Re: [PATCH] Revert "cpufreq: intel_pstate: Fix ->set_policy() interface for no_turbo"

[Gabriele Mazzotta]

On 07/08/2018 00:11, Srinivas Pandruvada wrote:
> On Mon, 2018-08-06 at 23:50 +0200, Gabriele Mazzotta wrote:
>> On 06/08/2018 18:49, Srinivas Pandruvada wrote:
>>> On Mon, 2018-08-06 at 10:30 +0200, Rafael J. Wysocki wrote:
>>>> On Sat, Aug 4, 2018 at 7:31 PM, Gabriele Mazzotta
>>>> <gabriele.mzt@gmail.com> wrote:
>>>>> On 04/08/2018 17:29, Gabriele Mazzotta wrote:
>>>>>> This change does not take into account that some BIOSes
>>>>>> change
>>>>>> MSR_IA32_MISC_ENABLE_TURBO_DISABLE depending on the power
>>>>>> source.
>>>>>> If the turbo is disabled when the system boots,
>>>>>> policy.max_freq
>>>>>> is set to pstate.max_pstate. However, if the BIOS later
>>>>>> enables
>>>>>> the turbo, the CPU will never be able to run at
>>>>>> pstate.turbo_pstate.
>>>>>>
>>>>>> Since now intel_pstate_set_policy() does its calculations
>>>>>> using
>>>>>> pstate.max_freq and pstate.turbo_freq, we can always
>>>>>> calculate
>>>>>> cpuinfo.max_freq using pstate.turbo_pstate, thus allowing
>>>>>> system
>>>>>> with varying MSR_IA32_MISC_ENABLE_TURBO_DISABLE to run at
>>>>>> full
>>>>>> speed when the turbo is enabled.
>>>>
>>>> Well, the problem with this approach is that always using
>>>> pstate.turbo_pstate as the max causes the governor to
>>>> overestimate
>>>> the
>>>> target frequency when the turbo range is not available (the
>>>> target
>>>> depends on the width of the entire available P-state range
>>>> including
>>>> turbo, so if the turbo range is not available, the number take
>>>> into
>>>> that computation is too large).
>>>>
>>>> Are we expected to get notified when the BIOS updates
>>>> MSR_IA32_MISC_ENABLE_TURBO_DISABLE?
>>>
>>> Let's try this:
>>> - boot with kernel command line 
>>>
>>> intel_pstate=support_acpi_ppc dyndbg="file processor_perflib.c +p"
>>> dyndbg="file intel_pstate.c +p"
>>
> Interesting output.
> Can you run ?
> # turbostat --debug 
> in both plugged and unplugged state.

This is the output of turbostat while plugged in, with
intel_pstate=support_acpi_ppc in the cmdline:

turbostat version 18.06.20 - Len Brown <lenb@kernel.org>
CPUID(0): GenuineIntel 13 CPUID levels; family:model:stepping 0x6:45:1 (6:69:1)
CPUID(1): SSE3 MONITOR - EIST TM2 TSC MSR ACPI-TM HT TM
CPUID(6): APERF, TURBO, DTS, PTM, No-HWP, No-HWPnotify, No-HWPwindow, No-HWPepp, No-HWPpkg, EPB
cpu0: MSR_IA32_MISC_ENABLE: 0x00850089 (TCC EIST MWAIT PREFETCH TURBO)
CPUID(7): No-SGX
cpu0: MSR_MISC_PWR_MGMT: 0x00400000 (ENable-EIST_Coordination DISable-EPB DISable-OOB)
RAPL: 17476 sec. Joule Counter Range, at 15 Watts
cpu0: MSR_PLATFORM_INFO: 0x8083df3011800
8 * 100.0 = 800.0 MHz max efficiency frequency
24 * 100.0 = 2400.0 MHz base frequency
cpu0: MSR_IA32_POWER_CTL: 0x0004005d (C1E auto-promotion: DISabled)
cpu0: MSR_TURBO_RATIO_LIMIT: 0x1b1b1b1e
27 * 100.0 = 2700.0 MHz max turbo 4 active cores
27 * 100.0 = 2700.0 MHz max turbo 3 active cores
27 * 100.0 = 2700.0 MHz max turbo 2 active cores
30 * 100.0 = 3000.0 MHz max turbo 1 active cores
cpu0: MSR_CONFIG_TDP_NOMINAL: 0x00000012 (base_ratio=18)
cpu0: MSR_CONFIG_TDP_LEVEL_1: 0x0008005c (PKG_MIN_PWR_LVL1=0 PKG_MAX_PWR_LVL1=0 LVL1_RATIO=8 PKG_TDP_LVL1=92)
cpu0: MSR_CONFIG_TDP_LEVEL_2: 0x001800c8 (PKG_MIN_PWR_LVL2=0 PKG_MAX_PWR_LVL2=0 LVL2_RATIO=24 PKG_TDP_LVL2=200)
cpu0: MSR_CONFIG_TDP_CONTROL: 0x00000000 ( lock=0)
cpu0: MSR_TURBO_ACTIVATION_RATIO: 0x00000011 (MAX_NON_TURBO_RATIO=17 lock=0)
cpu0: MSR_PKG_CST_CONFIG_CONTROL: 0x1e008407 (UNdemote-C3, UNdemote-C1, demote-C3, demote-C1, locked, pkg-cstate-limit=7 (pc9))
cpu0: POLL: CPUIDLE CORE POLL IDLE
cpu0: C1: MWAIT 0x00
cpu0: C1E: MWAIT 0x01
cpu0: C3: MWAIT 0x10
cpu0: C6: MWAIT 0x20
cpu0: C7s: MWAIT 0x32
cpu0: C8: MWAIT 0x40
cpu0: C9: MWAIT 0x50
cpu0: C10: MWAIT 0x60
cpu0: cpufreq driver: intel_pstate
cpu0: cpufreq governor: powersave
cpufreq intel_pstate no_turbo: 0
cpu0: MSR_MISC_FEATURE_CONTROL: 0x00000000 (L2-Prefetch L2-Prefetch-pair L1-Prefetch L1-IP-Prefetch)
cpu0: MSR_IA32_ENERGY_PERF_BIAS: 0x00000006 (balanced)
cpu0: MSR_CORE_PERF_LIMIT_REASONS, 0x1d210020 (Active: Auto-HWP, ) (Logged: MultiCoreTurbo, PkgPwrL2, PkgPwrL1, Amps, Auto-HWP, PROCHOT, )
cpu0: MSR_GFX_PERF_LIMIT_REASONS, 0x1c010000 (Active: ) (Logged: PROCHOT, PkgPwrL1, PkgPwrL2, )
cpu0: MSR_RING_PERF_LIMIT_REASONS, 0x0d010000 (Active: ) (Logged: PROCHOT, Amps, PkgPwrL1, PkgPwrL2, )
cpu0: MSR_RAPL_POWER_UNIT: 0x000a0e03 (0.125000 Watts, 0.000061 Joules, 0.000977 sec.)
cpu0: MSR_PKG_POWER_INFO: 0x00000078 (15 W TDP, RAPL 0 - 0 W, 0.000000 sec.)
cpu0: MSR_PKG_POWER_LIMIT: 0x420078001480c8 (UNlocked)
cpu0: PKG Limit #1: ENabled (25.000000 Watts, 1.000000 sec, clamp DISabled)
cpu0: PKG Limit #2: DISabled (15.000000 Watts, 0.002441* sec, clamp DISabled)
cpu0: MSR_PP0_POLICY: 0
cpu0: MSR_PP0_POWER_LIMIT: 0x00000000 (UNlocked)
cpu0: Cores Limit: DISabled (0.000000 Watts, 0.000977 sec, clamp DISabled)
cpu0: MSR_PP1_POLICY: 0
cpu0: MSR_PP1_POWER_LIMIT: 0x00000000 (UNlocked)
cpu0: GFX Limit: DISabled (0.000000 Watts, 0.000977 sec, clamp DISabled)
cpu0: MSR_IA32_TEMPERATURE_TARGET: 0x00640000 (100 C)
cpu0: MSR_IA32_PACKAGE_THERM_STATUS: 0x882d0808 (55 C)
cpu0: MSR_IA32_PACKAGE_THERM_INTERRUPT: 0x00000003 (100 C, 100 C)
cpu0: MSR_IA32_THERM_STATUS: 0x882d0808 (55 C +/- 1)
cpu0: MSR_IA32_THERM_INTERRUPT: 0x00000013 (100 C, 100 C)
cpu2: MSR_IA32_THERM_STATUS: 0x88300808 (52 C +/- 1)
cpu2: MSR_IA32_THERM_INTERRUPT: 0x00000013 (100 C, 100 C)
cpu0: MSR_PKGC3_IRTL: 0x00008842 (valid, 67584 ns)
cpu0: MSR_PKGC6_IRTL: 0x00008873 (valid, 117760 ns)
cpu0: MSR_PKGC7_IRTL: 0x00008891 (valid, 148480 ns)
cpu0: MSR_PKGC8_IRTL: 0x000088e4 (valid, 233472 ns)
cpu0: MSR_PKGC9_IRTL: 0x00008945 (valid, 332800 ns)
cpu0: MSR_PKGC10_IRTL: 0x00009003 (valid, 3 ns)


And this is what I get after I unplug the laptop:

turbostat version 18.06.20 - Len Brown <lenb@kernel.org>
CPUID(0): GenuineIntel 13 CPUID levels; family:model:stepping 0x6:45:1 (6:69:1)
CPUID(1): SSE3 MONITOR - EIST TM2 TSC MSR ACPI-TM HT TM
CPUID(6): APERF, No-TURBO, DTS, PTM, No-HWP, No-HWPnotify, No-HWPwindow, No-HWPepp, No-HWPpkg, EPB
cpu3: MSR_IA32_MISC_ENABLE: 0x4000850089 (TCC EIST MWAIT PREFETCH No-TURBO)
CPUID(7): No-SGX
cpu3: MSR_MISC_PWR_MGMT: 0x00400000 (ENable-EIST_Coordination DISable-EPB DISable-OOB)
RAPL: 17476 sec. Joule Counter Range, at 15 Watts
cpu3: MSR_PLATFORM_INFO: 0x8083df3011800
8 * 100.0 = 800.0 MHz max efficiency frequency
24 * 100.0 = 2400.0 MHz base frequency
cpu3: MSR_IA32_POWER_CTL: 0x0004005d (C1E auto-promotion: DISabled)
cpu3: MSR_TURBO_RATIO_LIMIT: 0x1b1b1b1e
27 * 100.0 = 2700.0 MHz max turbo 4 active cores
27 * 100.0 = 2700.0 MHz max turbo 3 active cores
27 * 100.0 = 2700.0 MHz max turbo 2 active cores
30 * 100.0 = 3000.0 MHz max turbo 1 active cores
cpu3: MSR_CONFIG_TDP_NOMINAL: 0x00000012 (base_ratio=18)
cpu3: MSR_CONFIG_TDP_LEVEL_1: 0x0008005c (PKG_MIN_PWR_LVL1=0 PKG_MAX_PWR_LVL1=0 LVL1_RATIO=8 PKG_TDP_LVL1=92)
cpu3: MSR_CONFIG_TDP_LEVEL_2: 0x001800c8 (PKG_MIN_PWR_LVL2=0 PKG_MAX_PWR_LVL2=0 LVL2_RATIO=24 PKG_TDP_LVL2=200)
cpu3: MSR_CONFIG_TDP_CONTROL: 0x00000000 ( lock=0)
cpu3: MSR_TURBO_ACTIVATION_RATIO: 0x00000011 (MAX_NON_TURBO_RATIO=17 lock=0)
cpu3: MSR_PKG_CST_CONFIG_CONTROL: 0x1e008407 (UNdemote-C3, UNdemote-C1, demote-C3, demote-C1, locked, pkg-cstate-limit=7 (pc9))
cpu3: POLL: CPUIDLE CORE POLL IDLE
cpu3: C1: MWAIT 0x00
cpu3: C1E: MWAIT 0x01
cpu3: C3: MWAIT 0x10
cpu3: C6: MWAIT 0x20
cpu3: C7s: MWAIT 0x32
cpu3: C8: MWAIT 0x40
cpu3: C9: MWAIT 0x50
cpu3: C10: MWAIT 0x60
cpu3: cpufreq driver: intel_pstate
cpu3: cpufreq governor: powersave
cpufreq intel_pstate no_turbo: 1
cpu3: MSR_MISC_FEATURE_CONTROL: 0x00000000 (L2-Prefetch L2-Prefetch-pair L1-Prefetch L1-IP-Prefetch)
cpu0: MSR_IA32_ENERGY_PERF_BIAS: 0x00000006 (balanced)
cpu0: MSR_CORE_PERF_LIMIT_REASONS, 0x1d210000 (Active: ) (Logged: MultiCoreTurbo, PkgPwrL2, PkgPwrL1, Amps, Auto-HWP, PROCHOT, )
cpu0: MSR_GFX_PERF_LIMIT_REASONS, 0x1c010000 (Active: ) (Logged: PROCHOT, PkgPwrL1, PkgPwrL2, )
cpu0: MSR_RING_PERF_LIMIT_REASONS, 0x0d010000 (Active: ) (Logged: PROCHOT, Amps, PkgPwrL1, PkgPwrL2, )
cpu0: MSR_RAPL_POWER_UNIT: 0x000a0e03 (0.125000 Watts, 0.000061 Joules, 0.000977 sec.)
cpu0: MSR_PKG_POWER_INFO: 0x00000078 (15 W TDP, RAPL 0 - 0 W, 0.000000 sec.)
cpu0: MSR_PKG_POWER_LIMIT: 0x420078001480c8 (UNlocked)
cpu0: PKG Limit #1: ENabled (25.000000 Watts, 1.000000 sec, clamp DISabled)
cpu0: PKG Limit #2: DISabled (15.000000 Watts, 0.002441* sec, clamp DISabled)
cpu0: MSR_PP0_POLICY: 0
cpu0: MSR_PP0_POWER_LIMIT: 0x00000000 (UNlocked)
cpu0: Cores Limit: DISabled (0.000000 Watts, 0.000977 sec, clamp DISabled)
cpu0: MSR_PP1_POLICY: 0
cpu0: MSR_PP1_POWER_LIMIT: 0x00000000 (UNlocked)
cpu0: GFX Limit: DISabled (0.000000 Watts, 0.000977 sec, clamp DISabled)
cpu0: MSR_IA32_TEMPERATURE_TARGET: 0x00640000 (100 C)
cpu0: MSR_IA32_PACKAGE_THERM_STATUS: 0x882f0808 (53 C)
cpu0: MSR_IA32_PACKAGE_THERM_INTERRUPT: 0x00000003 (100 C, 100 C)
cpu0: MSR_IA32_THERM_STATUS: 0x882f0808 (53 C +/- 1)
cpu0: MSR_IA32_THERM_INTERRUPT: 0x00000013 (100 C, 100 C)
cpu2: MSR_IA32_THERM_STATUS: 0x88300808 (52 C +/- 1)
cpu2: MSR_IA32_THERM_INTERRUPT: 0x00000013 (100 C, 100 C)
cpu3: MSR_PKGC3_IRTL: 0x00008842 (valid, 67584 ns)
cpu3: MSR_PKGC6_IRTL: 0x00008873 (valid, 117760 ns)
cpu3: MSR_PKGC7_IRTL: 0x00008891 (valid, 148480 ns)
cpu3: MSR_PKGC8_IRTL: 0x000088e4 (valid, 233472 ns)
cpu3: MSR_PKGC9_IRTL: 0x00008945 (valid, 332800 ns)
cpu3: MSR_PKGC10_IRTL: 0x00009003 (valid, 3 ns)


MSR_CORE_PERF_LIMIT_REASONS seems to have a different value
when plugged in depending on how the laptop booted. I don't
know if this is relevant, but this is what I noticed.

Right after a reboot while plugged in, I get:
cpu0: MSR_CORE_PERF_LIMIT_REASONS, 0x1d201000 (Active: MultiCoreTurbo, ) (Logged: MultiCoreTurbo, PkgPwrL2, PkgPwrL1, Amps, Auto-HWP, )
If unplug and replug, I get:
cpu0: MSR_CORE_PERF_LIMIT_REASONS, 0x1d210020 (Active: Auto-HWP, ) (Logged: MultiCoreTurbo, PkgPwrL2, PkgPwrL1, Amps, Auto-HWP, PROCHOT, )

If the laptop booted while unplgged, I constantly get:
cpu0: MSR_CORE_PERF_LIMIT_REASONS, 0x14000000 (Active: ) (Logged: MultiCoreTurbo, PkgPwrL1, )


> Also output of acpidump?

You can find it here:
https://bugzilla.kernel.org/attachment.cgi?id=178381

> 
>> Plugged -> Unplugged:
>>
>> [   40.046116] CPU 0: _PPC is 6 - frequency  limited
>> [   40.046128] intel_pstate: policy->max > max non turbo frequency
>> [   40.046131] intel_pstate: set_policy cpuinfo.max 3000000 policy-
>>> max 3000000
>> [   40.046134] intel_pstate: cpu:0 max_state 30 min_policy_perf:8
>> max_policy_perf:30
>> [   40.046137] intel_pstate: cpu:0 global_min:8 global_max:30
>> [   40.046140] intel_pstate: cpu:0 max_perf_ratio:30 min_perf_ratio:8
>> [   40.162173] CPU 0: _PPC is 6 - frequency  limited
>> [   40.162186] intel_pstate: policy->max > max non turbo frequency
>> [   40.162190] intel_pstate: set_policy cpuinfo.max 3000000 policy-
>>> max 3000000
>> [   40.162194] intel_pstate: cpu:0 max_state 30 min_policy_perf:8
>> max_policy_perf:30
>> [   40.162197] intel_pstate: cpu:0 global_min:8 global_max:30
>> [   40.162200] intel_pstate: cpu:0 max_perf_ratio:30 min_perf_ratio:8
>> [   40.162215] CPU 0: _PPC is 6 - frequency  limited
>> [   40.162220] intel_pstate: policy->max > max non turbo frequency
>> [   40.162223] intel_pstate: set_policy cpuinfo.max 3000000 policy-
>>> max 3000000
>> [   40.162226] intel_pstate: cpu:0 max_state 30 min_policy_perf:8
>> max_policy_perf:30
>> [   40.162228] intel_pstate: cpu:0 global_min:8 global_max:30
>> [   40.162230] intel_pstate: cpu:0 max_perf_ratio:30 min_perf_ratio:8
>> [   40.162237] CPU 0: _PPC is 6 - frequency  limited
>> [   40.162241] intel_pstate: policy->max > max non turbo frequency
>> [   40.162243] intel_pstate: set_policy cpuinfo.max 3000000 policy-
>>> max 3000000
>> [   40.162245] intel_pstate: cpu:0 max_state 30 min_policy_perf:8
>> max_policy_perf:30
>> [   40.162247] intel_pstate: cpu:0 global_min:8 global_max:30
>> [   40.162249] intel_pstate: cpu:0 max_perf_ratio:30 min_perf_ratio:8
>> [   40.162257] CPU 0: _PPC is 6 - frequency  limited
>> [   40.162261] intel_pstate: policy->max > max non turbo frequency
>> [   40.162263] intel_pstate: set_policy cpuinfo.max 3000000 policy-
>>> max 3000000
>> [   40.162265] intel_pstate: cpu:0 max_state 30 min_policy_perf:8
>> max_policy_perf:30
>> [   40.162267] intel_pstate: cpu:0 global_min:8 global_max:30
>> [   40.162269] intel_pstate: cpu:0 max_perf_ratio:30 min_perf_ratio:8
>>
>> Unplugged -> Plugged:
>>
>> [   52.648535] CPU 0: _PPC is 6 - frequency  limited
>> [   52.648553] intel_pstate: set_policy cpuinfo.max 3000000 policy-
>>> max 1700000
>> [   52.648558] intel_pstate: cpu:0 max_state 17 min_policy_perf:8
>> max_policy_perf:17
>> [   52.648562] intel_pstate: cpu:0 global_min:8 global_max:30
>> [   52.648566] intel_pstate: cpu:0 max_perf_ratio:17 min_perf_ratio:8
>> [   52.648583] CPU 0: _PPC is 6 - frequency  limited
>> [   52.648590] intel_pstate: set_policy cpuinfo.max 3000000 policy-
>>> max 1700000
>> [   52.648595] intel_pstate: cpu:0 max_state 17 min_policy_perf:8
>> max_policy_perf:17
>> [   52.648598] intel_pstate: cpu:0 global_min:8 global_max:30
>> [   52.648602] intel_pstate: cpu:0 max_perf_ratio:17 min_perf_ratio:8
>> [   52.656093] CPU 0: _PPC is 6 - frequency  limited
>> [   52.656111] intel_pstate: set_policy cpuinfo.max 3000000 policy-
>>> max 1700000
>> [   52.656116] intel_pstate: cpu:0 max_state 17 min_policy_perf:8
>> max_policy_perf:17
>> [   52.656120] intel_pstate: cpu:0 global_min:8 global_max:30
>> [   52.656123] intel_pstate: cpu:0 max_perf_ratio:17 min_perf_ratio:8
>> [   52.775577] CPU 0: _PPC is 6 - frequency  limited
>> [   52.775594] intel_pstate: set_policy cpuinfo.max 3000000 policy-
>>> max 1700000
>> [   52.775598] intel_pstate: cpu:0 max_state 17 min_policy_perf:8
>> max_policy_perf:17
>> [   52.775601] intel_pstate: cpu:0 global_min:8 global_max:30
>> [   52.775604] intel_pstate: cpu:0 max_perf_ratio:17 min_perf_ratio:8
>> [   53.028620] CPU 0: _PPC is 6 - frequency  limited
>> [   53.028637] intel_pstate: set_policy cpuinfo.max 3000000 policy-
>>> max 1700000
>> [   53.028643] intel_pstate: cpu:0 max_state 17 min_policy_perf:8
>> max_policy_perf:17
>> [   53.028647] intel_pstate: cpu:0 global_min:8 global_max:30
>> [   53.028651] intel_pstate: cpu:0 max_perf_ratio:17 min_perf_ratio:8
>>
>>> and send dmesg after you change power sources.
>>>
>>> - Also try with
>>> intel_pstate=disable dyndbg="file processor_perflib.c +p"
>>
>> Nothing gets printed with this one.
>>
>> Thanks,
>> Gabriele
>>
>>> and send dmesg.
>>>
>>> Thanks,
>>> Srinivas
>>>
>>>

Re: [PATCH] Revert "cpufreq: intel_pstate: Fix ->set_policy() interface for no_turbo"

[Srinivas Pandruvada]

On Tue, 2018-08-07 at 22:12 +0200, Gabriele Mazzotta wrote:
> On 07/08/2018 00:11, Srinivas Pandruvada wrote:
> > On Mon, 2018-08-06 at 23:50 +0200, Gabriele Mazzotta wrote:
> > > On 06/08/2018 18:49, Srinivas Pandruvada wrote:
> > > > On Mon, 2018-08-06 at 10:30 +0200, Rafael J. Wysocki wrote:
> > > > > On Sat, Aug 4, 2018 at 7:31 PM, Gabriele Mazzotta
> > > > > <gabriele.mzt@gmail.com> wrote:
> > > > > > On 04/08/2018 17:29, Gabriele Mazzotta wrote:
> > > > > > > This change does not take into account that some BIOSes
> > > > > > > change
> > > > > > > MSR_IA32is getting notified via PPC
> > > > > > > change._MISC_ENABLE_TURBO_DISABLE depending on the power
> > > > > > > source.
> > > > > > > If the turbo is disabled when the system boots,
> > > > > > > policy.max_freq
> > > > > > > is set to pstate.max_pstate. However, if the BIOS later
> > > > > > > enables
> > > > > > > the turbo, the CPU will never be able to run at
> > > > > > > pstate.turbo_pstate.
> > > > > > > is getting notified via PPC change.
> > > > > > > Since now intel_pstate_set_policy() does its calculations
> > > > > > > using
> > > > > > > pstate.max_freq and pstate.turbo_freq, we can always
> > > > > > > calculate
> > > > > > > cpuinfo.max_freq using pstate.turbo_pstate, thus allowing
> > > > > > > system
> > > > > > > with varying MSR_IA32_MISC_ENABLE_TURBO_DISABLE to run at
> > > > > > > full
> > > > > > > speed when the turbo is enabled.
> > > > > 
> > > > > Well, the problem with this approach is that always using
> > > > > pstate.turbo_pstate as the max causes the governor to
> > > > > overestimate
> > > > > the
> > > > > target frequency when the turbo range is not available (the
> > > > > target
> > > > > depends on the width of the entire available P-state range
> > > > > including
> > > > > turbo, so if the turbo range is not available, the number
> > > > > take
> > > > > into
> > > > > that computation is too large).
> > > > > 
> > > > > Are we expected to get notified when the BIOS updates
> > > > > MSR_IA32_MISC_ENABLE_TURBO_DISABLE?
> > > > 
> > > > Let's try this:
> > > > - boot with kernel command line 
> > > > 
> > > > intel_pstate=support_acpi_ppc dyndbg="file processor_perflib.c
> > > > +p"
> > > > dyndbg="file intel_pstate.c +p"
> > 
Can you create a bugzilla? In this way easy to exchange attachments.
For example in the above command line I was expecting boot up traces
from intel_pstate (I need full dmesg). From the log with PPC=6 should
correspond to 1.6GHz from acpi dump.
Even after power is connected the PPC is still requesting to be 6.

I will attach some test patch to bugzilla after checking the full
dmesg.


turbostat log shoes that turbo was disabled on unplug but it is getting
notified via some PPC change.

Thanks,
Srinivas

> > Interesting output.
> > Can you run ?
> > # turbostat --debug 
> > in both plugged and unplugged state.
> 
> This is the output of turbostat while plugged in, with
> intel_pstate=support_acpi_ppc in the cmdline:
> 
> turbostat version 18.06.20 - Len Brown <lenb@kernel.org>
> CPUID(0): GenuineIntel 13 CPUID levels; family:model:stepping
> 0x6:45:1 (6:69:1)
> CPUID(1): SSE3 MONITOR - EIST TM2 TSC MSR ACPI-TM HT TM
> CPUID(6): APERF, TURBO, DTS, PTM, No-HWP, No-HWPnotify, No-HWPwindow, 
> No-HWPepp, No-HWPpkg, EPB
> cpu0: MSR_IA32_MISC_ENABLE: 0x00850089 (TCC EIST MWAIT PREFETCH
> TURBO)
> CPUID(7): No-SGX
> cpu0: MSR_MISC_PWR_MGMT: 0x00400000 (ENable-EIST_Coordination
> DISable-EPB DISable-OOB)
> RAPL: 17476 sec. Joule Counter Range, at 15 Watts
> cpu0: MSR_PLATFORM_INFO: 0x8083df3011800
> 8 * 100.0 = 800.0 MHz max efficiency frequency
> 24 * 100.0 = 2400.0 MHz base frequency
> cpu0: MSR_IA32_POWER_CTL: 0x0004005d (C1E auto-promotion: DISabled)
> cpu0: MSR_TURBO_RATIO_LIMIT: 0x1b1b1b1e
> 27 * 100.0 = 2700.0 MHz max turbo 4 active cores
> 27 * 100.0 = 2700.0 MHz max turbo 3 active cores
> 27 * 100.0 = 2700.0 MHz max turbo 2 active cores
> 30 * 100.0 = 3000.0 MHz max turbo 1 active cores
> cpu0: MSR_CONFIG_TDP_NOMINAL: 0x00000012 (base_ratio=18)
> cpu0: MSR_CONFIG_TDP_LEVEL_1: 0x0008005c (PKG_MIN_PWR_LVL1=0
> PKG_MAX_PWR_LVL1=0 LVL1_RATIO=8 PKG_TDP_LVL1=92)
> cpu0: MSR_CONFIG_TDP_LEVEL_2: 0x001800c8 (PKG_MIN_PWR_LVL2=0
> PKG_MAX_PWR_LVL2=0 LVL2_RATIO=24 PKG_TDP_LVL2=200)
> cpu0: MSR_CONFIG_TDP_CONTROL: 0x00000000 ( lock=0)
> cpu0: MSR_TURBO_ACTIVATION_RATIO: 0x00000011 (MAX_NON_TURBO_RATIO=17
> lock=0)
> cpu0: MSR_PKG_CST_CONFIG_CONTROL: 0x1e008407 (UNdemote-C3, UNdemote-
> C1, demote-C3, demote-C1, locked, pkg-cstate-limit=7 (pc9))
> cpu0: POLL: CPUIDLE CORE POLL IDLE
> cpu0: C1: MWAIT 0x00
> cpu0: C1E: MWAIT 0x01
> cpu0: C3: MWAIT 0x10
> cpu0: C6: MWAIT 0x20
> cpu0: C7s: MWAIT 0x32
> cpu0: C8: MWAIT 0x40
> cpu0: C9: MWAIT 0x50
> cpu0: C10: MWAIT 0x60
> cpu0: cpufreq driver: intel_pstate
> cpu0: cpufreq governor: powersave
> cpufreq intel_pstate no_turbo: 0
> cpu0: MSR_MISC_FEATURE_CONTROL: 0x00000000 (L2-Prefetch L2-Prefetch-
> pair L1-Prefetch L1-IP-Prefetch)
> cpu0: MSR_IA32_ENERGY_PERF_BIAS: 0x00000006 (balanced)
> cpu0: MSR_CORE_PERF_LIMIT_REASONS, 0x1d210020 (Active: Auto-HWP, )
> (Logged: MultiCoreTurbo, PkgPwrL2, PkgPwrL1, Amps, Auto-HWP, PROCHOT,
> )
> cpu0: MSR_GFX_PERF_LIMIT_REASONS, 0x1c010000 (Active: ) (Logged:
> PROCHOT, PkgPwrL1, PkgPwrL2, )
> cpu0: MSR_RING_PERF_LIMIT_REASONS, 0x0d010000 (Active: ) (Logged:
> PROCHOT, Amps, PkgPwrL1, PkgPwrL2, )
> cpu0: MSR_RAPL_POWER_UNIT: 0x000a0e03 (0.125000 Watts, 0.000061
> Joules, 0.000977 sec.)
> cpu0: MSR_PKG_POWER_INFO: 0x00000078 (15 W TDP, RAPL 0 - 0 W,
> 0.000000 sec.)
> cpu0: MSR_PKG_POWER_LIMIT: 0x420078001480c8 (UNlocked)
> cpu0: PKG Limit #1: ENabled (25.000000 Watts, 1.000000 sec, clamp
> DISabled)
> cpu0: PKG Limit #2: DISabled (15.000000 Watts, 0.002441* sec, clamp
> DISabled)
> cpu0: MSR_PP0_POLICY: 0
> cpu0: MSR_PP0_POWER_LIMIT: 0x00000000 (UNlocked)
> cpu0: Cores Limit: DISabled (0.000000 Watts, 0.000977 sec, clamp
> DISabled)
> cpu0: MSR_PP1_POLICY: 0
> cpu0: MSR_PP1_POWER_LIMIT: 0x00000000 (UNlocked)
> cpu0: GFX Limit: DISabled (0.000000 Watts, 0.000977 sec, clamp
> DISabled)
> cpu0: MSR_IA32_TEMPERATURE_TARGET: 0x00640000 (100 C)
> cpu0: MSR_IA32_PACKAGE_THERM_STATUS: 0x882d0808 (55 C)
> cpu0: MSR_IA32_PACKAGE_THERM_INTERRUPT: 0x00000003 (100 C, 100 C)
> cpu0: MSR_IA32_THERM_STATUS: 0x882d0808 (55 C +/- 1)
> cpu0: MSR_IA32_THERM_INTERRUPT: 0x00000013 (100 C, 100 C)
> cpu2: MSR_IA32_THERM_STATUS: 0x88300808 (52 C +/- 1)
> cpu2: MSR_IA32_THERM_INTERRUPT: 0x00000013 (100 C, 100 C)
> cpu0: MSR_PKGC3_IRTL: 0x00008842 (valid, 67584 ns)
> cpu0: MSR_PKGC6_IRTL: 0x00008873 (valid, 117760 ns)
> cpu0: MSR_PKGC7_IRTL: 0x00008891 (valid, 148480 ns)
> cpu0: MSR_PKGC8_IRTL: 0x000088e4 (valid, 233472 ns)
> cpu0: MSR_PKGC9_IRTL: 0x00008945 (valid, 332800 ns)
> cpu0: MSR_PKGC10_IRTL: 0x00009003 (valid, 3 ns)
> 
> 
> And this is what I get after I unplug the laptop:
> 
> turbostat version 18.06.20 - Len Brown <lenb@kernel.org>
> CPUID(0): GenuineIntel 13 CPUID levels; family:model:stepping
> 0x6:45:1 (6:69:1)
> CPUID(1): SSE3 MONITOR - EIST TM2 TSC MSR ACPI-TM HT TM
> CPUID(6): APERF, No-TURBO, DTS, PTM, No-HWP, No-HWPnotify, No-
> HWPwindow, No-HWPepp, No-HWPpkg, EPB
> cpu3: MSR_IA32_MISC_ENABLE: 0x4000850089 (TCC EIST MWAIT PREFETCH No-
> TURBO)
> CPUID(7): No-SGX
> cpu3: MSR_MISC_PWR_MGMT: 0x00400000 (ENable-EIST_Coordination
> DISable-EPB DISable-OOB)
> RAPL: 17476 sec. Joule Counter Range, at 15 Watts
> cpu3: MSR_PLATFORM_INFO: 0x8083df3011800
> 8 * 100.0 = 800.0 MHz max efficiency frequency
> 24 * 100.0 = 2400.0 MHz base frequency
> cpu3: MSR_IA32_POWER_CTL: 0x0004005d (C1E auto-promotion: DISabled)
> cpu3: MSR_TURBO_RATIO_LIMIT: 0x1b1b1b1e
> 27 * 100.0 = 2700.0 MHz max turbo 4 active cores
> 27 * 100.0 = 2700.0 MHz max turbo 3 active cores
> 27 * 100.0 = 2700.0 MHz max turbo 2 active cores
> 30 * 100.0 = 3000.0 MHz max turbo 1 active cores
> cpu3: MSR_CONFIG_TDP_NOMINAL: 0x00000012 (base_ratio=18)
> cpu3: MSR_CONFIG_TDP_LEVEL_1: 0x0008005c (PKG_MIN_PWR_LVL1=0
> PKG_MAX_PWR_LVL1=0 LVL1_RATIO=8 PKG_TDP_LVL1=92)
> cpu3: MSR_CONFIG_TDP_LEVEL_2: 0x001800c8 (PKG_MIN_PWR_LVL2=0
> PKG_MAX_PWR_LVL2=0 LVL2_RATIO=24 PKG_TDP_LVL2=200)
> cpu3: MSR_CONFIG_TDP_CONTROL: 0x00000000 ( lock=0)
> cpu3: MSR_TURBO_ACTIVATION_RATIO: 0x00000011 (MAX_NON_TURBO_RATIO=17
> lock=0)
> cpu3: MSR_PKG_CST_CONFIG_CONTROL: 0x1e008407 (UNdemote-C3, UNdemote-
> C1, demote-C3, demote-C1, locked, pkg-cstate-limit=7 (pc9))
> cpu3: POLL: CPUIDLE CORE POLL IDLE
> cpu3: C1: MWAIT 0x00
> cpu3: C1E: MWAIT 0x01
> cpu3: C3: MWAIT 0x10
> cpu3: C6: MWAIT 0x20
> cpu3: C7s: MWAIT 0x32
> cpu3: C8: MWAIT 0x40
> cpu3: C9: MWAIT 0x50
> cpu3: C10: MWAIT 0x60
> cpu3: cpufreq driver: intel_pstate
> cpu3: cpufreq governor: powersave
> cpufreq intel_pstate no_turbo: 1
> cpu3: MSR_MISC_FEATURE_CONTROL: 0x00000000 (L2-Prefetch L2-Prefetch-
> pair L1-Prefetch L1-IP-Prefetch)
> cpu0: MSR_IA32_ENERGY_PERF_BIAS: 0x00000006 (balanced)
> cpu0: MSR_CORE_PERF_LIMIT_REASONS, 0x1d210000 (Active: ) (Logged:
> MultiCoreTurbo, PkgPwrL2, PkgPwrL1, Amps, Auto-HWP, PROCHOT, )
> cpu0: MSR_GFX_PERF_LIMIT_REASONS, 0x1c010000 (Active: ) (Logged:
> PROCHOT, PkgPwrL1, PkgPwrL2, )
> cpu0: MSR_RING_PERF_LIMIT_REASONS, 0x0d010000 (Active: ) (Logged:
> PROCHOT, Amps, PkgPwrL1, PkgPwrL2, )
> cpu0: MSR_RAPL_POWER_UNIT: 0x000a0e03 (0.125000 Watts, 0.000061
> Joules, 0.000977 sec.)
> cpu0: MSR_PKG_POWER_INFO: 0x00000078 (15 W TDP, RAPL 0 - 0 W,
> 0.000000 sec.)
> cpu0: MSR_PKG_POWER_LIMIT: 0x420078001480c8 (UNlocked)
> cpu0: PKG Limit #1: ENabled (25.000000 Watts, 1.000000 sec, clamp
> DISabled)
> cpu0: PKG Limit #2: DISabled (15.000000 Watts, 0.002441* sec, clamp
> DISabled)
> cpu0: MSR_PP0_POLICY: 0
> cpu0: MSR_PP0_POWER_LIMIT: 0x00000000 (UNlocked)
> cpu0: Cores Limit: DISabled (0.000000 Watts, 0.000977 sec, clamp
> DISabled)
> cpu0: MSR_PP1_POLICY: 0
> cpu0: MSR_PP1_POWER_LIMIT: 0x00000000 (UNlocked)
> cpu0: GFX Limit: DISabled (0.000000 Watts, 0.000977 sec, clamp
> DISabled)
> cpu0: MSR_IA32_TEMPERATURE_TARGET: 0x00640000 (100 C)
> cpu0: MSR_IA32_PACKAGE_THERM_STATUS: 0x882f0808 (53 C)
> cpu0: MSR_IA32_PACKAGE_THERM_INTERRUPT: 0x00000003 (100 C, 100 C)
> cpu0: MSR_IA32_THERM_STATUS: 0x882f0808 (53 C +/- 1)
> cpu0: MSR_IA32_THERM_INTERRUPT: 0x00000013 (100 C, 100 C)
> cpu2: MSR_IA32_THERM_STATUS: 0x88300808 (52 C +/- 1)
> cpu2: MSR_IA32_THERM_INTERRUPT: 0x00000013 (100 C, 100 C)
> cpu3: MSR_PKGC3_IRTL: 0x00008842 (valid, 67584 ns)
> cpu3: MSR_PKGC6_IRTL: 0x00008873 (valid, 117760 ns)
> cpu3: MSR_PKGC7_IRTL: 0x00008891 (valid, 148480 ns)
> cpu3: MSR_PKGC8_IRTL: 0x000088e4 (valid, 233472 ns)
> cpu3: MSR_PKGC9_IRTL: 0x00008945 (valid, 332800 ns)
> cpu3: MSR_PKGC10_IRTL: 0x00009003 (valid, 3 ns)
> 
> 
> MSR_CORE_PERF_LIMIT_REASONS seems to have a different value
> when plugged in depending on how the laptop booted. I don't
> know if this is relevant, but this is what I noticed.
> 
> Right after a reboot while plugged in, I get:
> cpu0: MSR_CORE_PERF_LIMIT_REASONS, 0x1d201000 (Active:
> MultiCoreTurbo, ) (Logged: MultiCoreTurbo, PkgPwrL2, PkgPwrL1, Amps,
> Auto-HWP, )
> If unplug and replug, I get:
> cpu0: MSR_CORE_PERF_LIMIT_REASONS, 0x1d210020 (Active: Auto-HWP, )
> (Logged: MultiCoreTurbo, PkgPwrL2, PkgPwrL1, Amps, Auto-HWP, PROCHOT,
> )
> 
> If the laptop booted while unplgged, I constantly get:
> cpu0: MSR_CORE_PERF_LIMIT_REASONS, 0x14000000 (Active: ) (Logged:
> MultiCoreTurbo, PkgPwrL1, )
> 
> 
> > Also output of acpidump?
> 
> You can find it here:
> https://bugzilla.kernel.org/attachment.cgi?id=178381
> 
> > 
> > > Plugged -> Unplugged:
> > > 
> > > [   40.046116] CPU 0: _PPC is 6 - frequency  limited
> > > [   40.046128] intel_pstate: policy->max > max non turbo
> > > frequency
> > > [   40.046131] intel_pstate: set_policy cpuinfo.max 3000000
> > > policy-
> > > > max 3000000
> > > 
> > > [   40.046134] intel_pstate: cpu:0 max_state 30 min_policy_perf:8
> > > max_policy_perf:30
> > > [   40.046137] intel_pstate: cpu:0 global_min:8 global_max:30
> > > [   40.046140] intel_pstate: cpu:0 max_perf_ratio:30
> > > min_perf_ratio:8
> > > [   40.162173] CPU 0: _PPC is 6 - frequency  limited
> > > [   40.162186] intel_pstate: policy->max > max non turbo
> > > frequency
> > > [   40.162190] intel_pstate: set_policy cpuinfo.max 3000000
> > > policy-
> > > > max 3000000
> > > 
> > > [   40.162194] intel_pstate: cpu:0 max_state 30 min_policy_perf:8
> > > max_policy_perf:30
> > > [   40.162197] intel_pstate: cpu:0 global_min:8 global_max:30
> > > [   40.162200] intel_pstate: cpu:0 max_perf_ratio:30
> > > min_perf_ratio:8
> > > [   40.162215] CPU 0: _PPC is 6 - frequency  limited
> > > [   40.162220] intel_pstate: policy->max > max non turbo
> > > frequency
> > > [   40.162223] intel_pstate: set_policy cpuinfo.max 3000000
> > > policy-
> > > > max 3000000
> > > 
> > > [   40.162226] intel_pstate: cpu:0 max_state 30 min_policy_perf:8
> > > max_policy_perf:30
> > > [   40.162228] intel_pstate: cpu:0 global_min:8 global_max:30
> > > [   40.162230] intel_pstate: cpu:0 max_perf_ratio:30
> > > min_perf_ratio:8
> > > [   40.162237] CPU 0: _PPC is 6 - frequency  limited
> > > [   40.162241] intel_pstate: policy->max > max non turbo
> > > frequency
> > > [   40.162243] intel_pstate: set_policy cpuinfo.max 3000000
> > > policy-
> > > > max 3000000
> > > 
> > > [   40.162245] intel_pstate: cpu:0 max_state 30 min_policy_perf:8
> > > max_policy_perf:30
> > > [   40.162247] intel_pstate: cpu:0 global_min:8 global_max:30
> > > [   40.162249] intel_pstate: cpu:0 max_perf_ratio:30
> > > min_perf_ratio:8
> > > [   40.162257] CPU 0: _PPC is 6 - frequency  limited
> > > [   40.162261] intel_pstate: policy->max > max non turbo
> > > frequency
> > > [   40.162263] intel_pstate: set_policy cpuinfo.max 3000000
> > > policy-
> > > > max 3000000
> > > 
> > > [   40.162265] intel_pstate: cpu:0 max_state 30 min_policy_perf:8
> > > max_policy_perf:30
> > > [   40.162267] intel_pstate: cpu:0 global_min:8 global_max:30
> > > [   40.162269] intel_pstate: cpu:0 max_perf_ratio:30
> > > min_perf_ratio:8
> > > 
> > > Unplugged -> Plugged:
> > > 
> > > [   52.648535] CPU 0: _PPC is 6 - frequency  limited
> > > [   52.648553] intel_pstate: set_policy cpuinfo.max 3000000
> > > policy-
> > > > max 1700000
> > > 
> > > [   52.648558] intel_pstate: cpu:0 max_state 17 min_policy_perf:8
> > > max_policy_perf:17
> > > [   52.648562] intel_pstate: cpu:0 global_min:8 global_max:30
> > > [   52.648566] intel_pstate: cpu:0 max_perf_ratio:17
> > > min_perf_ratio:8
> > > [   52.648583] CPU 0: _PPC is 6 - frequency  limited
> > > [   52.648590] intel_pstate: set_policy cpuinfo.max 3000000
> > > policy-
> > > > max 1700000
> > > 
> > > [   52.648595] intel_pstate: cpu:0 max_state 17 min_policy_perf:8
> > > max_policy_perf:17
> > > [   52.648598] intel_pstate: cpu:0 global_min:8 global_max:30
> > > [   52.648602] intel_pstate: cpu:0 max_perf_ratio:17
> > > min_perf_ratio:8
> > > [   52.656093] CPU 0: _PPC is 6 - frequency  limited
> > > [   52.656111] intel_pstate: set_policy cpuinfo.max 3000000
> > > policy-
> > > > max 1700000
> > > 
> > > [   52.656116] intel_pstate: cpu:0 max_state 17 min_policy_perf:8
> > > max_policy_perf:17
> > > [   52.656120] intel_pstate: cpu:0 global_min:8 global_max:30
> > > [   52.656123] intel_pstate: cpu:0 max_perf_ratio:17
> > > min_perf_ratio:8
> > > [   52.775577] CPU 0: _PPC is 6 - frequency  limited
> > > [   52.775594] intel_pstate: set_policy cpuinfo.max 3000000
> > > policy-
> > > > max 1700000
> > > 
> > > [   52.775598] intel_pstate: cpu:0 max_state 17 min_policy_perf:8
> > > max_policy_perf:17
> > > [   52.775601] intel_pstate: cpu:0 global_min:8 global_max:30
> > > [   52.775604] intel_pstate: cpu:0 max_perf_ratio:17
> > > min_perf_ratio:8
> > > [   53.028620] CPU 0: _PPC is 6 - frequency  limited
> > > [   53.028637] intel_pstate: set_policy cpuinfo.max 3000000
> > > policy-
> > > > max 1700000
> > > 
> > > [   53.028643] intel_pstate: cpu:0 max_state 17 min_policy_perf:8
> > > max_policy_perf:17
> > > [   53.028647] intel_pstate: cpu:0 global_min:8 global_max:30
> > > [   53.028651] intel_pstate: cpu:0 max_perf_ratio:17
> > > min_perf_ratio:8
> > > 
> > > > and send dmesg after you change power sources.
> > > > 
> > > > - Also try with
> > > > intel_pstate=disable dyndbg="file processor_perflib.c +p"
> > > 
> > > Nothing gets printed with this one.
> > > 
> > > Thanks,
> > > Gabriele
> > > 
> > > > and send dmesg.
> > > > 
> > > > Thanks,
> > > > Srinivas
> > > > 
> > > > 

Re: [PATCH] Revert "cpufreq: intel_pstate: Fix ->set_policy() interface for no_turbo"

[Gabriele Mazzotta]

On 07/08/2018 23:22, Srinivas Pandruvada wrote:
> On Tue, 2018-08-07 at 22:12 +0200, Gabriele Mazzotta wrote:
>> On 07/08/2018 00:11, Srinivas Pandruvada wrote:
>>> On Mon, 2018-08-06 at 23:50 +0200, Gabriele Mazzotta wrote:
>>>> On 06/08/2018 18:49, Srinivas Pandruvada wrote:
>>>>> On Mon, 2018-08-06 at 10:30 +0200, Rafael J. Wysocki wrote:
>>>>>> On Sat, Aug 4, 2018 at 7:31 PM, Gabriele Mazzotta
>>>>>> <gabriele.mzt@gmail.com> wrote:
>>>>>>> On 04/08/2018 17:29, Gabriele Mazzotta wrote:
>>>>>>>> This change does not take into account that some BIOSes
>>>>>>>> change
>>>>>>>> MSR_IA32is getting notified via PPC
>>>>>>>> change._MISC_ENABLE_TURBO_DISABLE depending on the power
>>>>>>>> source.
>>>>>>>> If the turbo is disabled when the system boots,
>>>>>>>> policy.max_freq
>>>>>>>> is set to pstate.max_pstate. However, if the BIOS later
>>>>>>>> enables
>>>>>>>> the turbo, the CPU will never be able to run at
>>>>>>>> pstate.turbo_pstate.
>>>>>>>> is getting notified via PPC change.
>>>>>>>> Since now intel_pstate_set_policy() does its calculations
>>>>>>>> using
>>>>>>>> pstate.max_freq and pstate.turbo_freq, we can always
>>>>>>>> calculate
>>>>>>>> cpuinfo.max_freq using pstate.turbo_pstate, thus allowing
>>>>>>>> system
>>>>>>>> with varying MSR_IA32_MISC_ENABLE_TURBO_DISABLE to run at
>>>>>>>> full
>>>>>>>> speed when the turbo is enabled.
>>>>>>
>>>>>> Well, the problem with this approach is that always using
>>>>>> pstate.turbo_pstate as the max causes the governor to
>>>>>> overestimate
>>>>>> the
>>>>>> target frequency when the turbo range is not available (the
>>>>>> target
>>>>>> depends on the width of the entire available P-state range
>>>>>> including
>>>>>> turbo, so if the turbo range is not available, the number
>>>>>> take
>>>>>> into
>>>>>> that computation is too large).
>>>>>>
>>>>>> Are we expected to get notified when the BIOS updates
>>>>>> MSR_IA32_MISC_ENABLE_TURBO_DISABLE?
>>>>>
>>>>> Let's try this:
>>>>> - boot with kernel command line 
>>>>>
>>>>> intel_pstate=support_acpi_ppc dyndbg="file processor_perflib.c
>>>>> +p"
>>>>> dyndbg="file intel_pstate.c +p"
>>>
> Can you create a bugzilla? In this way easy to exchange attachments.
> For example in the above command line I was expecting boot up traces
> from intel_pstate (I need full dmesg). From the log with PPC=6 should
> correspond to 1.6GHz from acpi dump.
> Even after power is connected the PPC is still requesting to be 6.
> 
> I will attach some test patch to bugzilla after checking the full
> dmesg.

Done: https://bugzilla.kernel.org/show_bug.cgi?id=200759

Gabriele

> 
> turbostat log shoes that turbo was disabled on unplug but it is getting
> notified via some PPC change.
> 
> Thanks,
> Srinivas
> 
>>> Interesting output.
>>> Can you run ?
>>> # turbostat --debug 
>>> in both plugged and unplugged state.
>>
>> This is the output of turbostat while plugged in, with
>> intel_pstate=support_acpi_ppc in the cmdline:
>>
>> turbostat version 18.06.20 - Len Brown <lenb@kernel.org>
>> CPUID(0): GenuineIntel 13 CPUID levels; family:model:stepping
>> 0x6:45:1 (6:69:1)
>> CPUID(1): SSE3 MONITOR - EIST TM2 TSC MSR ACPI-TM HT TM
>> CPUID(6): APERF, TURBO, DTS, PTM, No-HWP, No-HWPnotify, No-HWPwindow, 
>> No-HWPepp, No-HWPpkg, EPB
>> cpu0: MSR_IA32_MISC_ENABLE: 0x00850089 (TCC EIST MWAIT PREFETCH
>> TURBO)
>> CPUID(7): No-SGX
>> cpu0: MSR_MISC_PWR_MGMT: 0x00400000 (ENable-EIST_Coordination
>> DISable-EPB DISable-OOB)
>> RAPL: 17476 sec. Joule Counter Range, at 15 Watts
>> cpu0: MSR_PLATFORM_INFO: 0x8083df3011800
>> 8 * 100.0 = 800.0 MHz max efficiency frequency
>> 24 * 100.0 = 2400.0 MHz base frequency
>> cpu0: MSR_IA32_POWER_CTL: 0x0004005d (C1E auto-promotion: DISabled)
>> cpu0: MSR_TURBO_RATIO_LIMIT: 0x1b1b1b1e
>> 27 * 100.0 = 2700.0 MHz max turbo 4 active cores
>> 27 * 100.0 = 2700.0 MHz max turbo 3 active cores
>> 27 * 100.0 = 2700.0 MHz max turbo 2 active cores
>> 30 * 100.0 = 3000.0 MHz max turbo 1 active cores
>> cpu0: MSR_CONFIG_TDP_NOMINAL: 0x00000012 (base_ratio=18)
>> cpu0: MSR_CONFIG_TDP_LEVEL_1: 0x0008005c (PKG_MIN_PWR_LVL1=0
>> PKG_MAX_PWR_LVL1=0 LVL1_RATIO=8 PKG_TDP_LVL1=92)
>> cpu0: MSR_CONFIG_TDP_LEVEL_2: 0x001800c8 (PKG_MIN_PWR_LVL2=0
>> PKG_MAX_PWR_LVL2=0 LVL2_RATIO=24 PKG_TDP_LVL2=200)
>> cpu0: MSR_CONFIG_TDP_CONTROL: 0x00000000 ( lock=0)
>> cpu0: MSR_TURBO_ACTIVATION_RATIO: 0x00000011 (MAX_NON_TURBO_RATIO=17
>> lock=0)
>> cpu0: MSR_PKG_CST_CONFIG_CONTROL: 0x1e008407 (UNdemote-C3, UNdemote-
>> C1, demote-C3, demote-C1, locked, pkg-cstate-limit=7 (pc9))
>> cpu0: POLL: CPUIDLE CORE POLL IDLE
>> cpu0: C1: MWAIT 0x00
>> cpu0: C1E: MWAIT 0x01
>> cpu0: C3: MWAIT 0x10
>> cpu0: C6: MWAIT 0x20
>> cpu0: C7s: MWAIT 0x32
>> cpu0: C8: MWAIT 0x40
>> cpu0: C9: MWAIT 0x50
>> cpu0: C10: MWAIT 0x60
>> cpu0: cpufreq driver: intel_pstate
>> cpu0: cpufreq governor: powersave
>> cpufreq intel_pstate no_turbo: 0
>> cpu0: MSR_MISC_FEATURE_CONTROL: 0x00000000 (L2-Prefetch L2-Prefetch-
>> pair L1-Prefetch L1-IP-Prefetch)
>> cpu0: MSR_IA32_ENERGY_PERF_BIAS: 0x00000006 (balanced)
>> cpu0: MSR_CORE_PERF_LIMIT_REASONS, 0x1d210020 (Active: Auto-HWP, )
>> (Logged: MultiCoreTurbo, PkgPwrL2, PkgPwrL1, Amps, Auto-HWP, PROCHOT,
>> )
>> cpu0: MSR_GFX_PERF_LIMIT_REASONS, 0x1c010000 (Active: ) (Logged:
>> PROCHOT, PkgPwrL1, PkgPwrL2, )
>> cpu0: MSR_RING_PERF_LIMIT_REASONS, 0x0d010000 (Active: ) (Logged:
>> PROCHOT, Amps, PkgPwrL1, PkgPwrL2, )
>> cpu0: MSR_RAPL_POWER_UNIT: 0x000a0e03 (0.125000 Watts, 0.000061
>> Joules, 0.000977 sec.)
>> cpu0: MSR_PKG_POWER_INFO: 0x00000078 (15 W TDP, RAPL 0 - 0 W,
>> 0.000000 sec.)
>> cpu0: MSR_PKG_POWER_LIMIT: 0x420078001480c8 (UNlocked)
>> cpu0: PKG Limit #1: ENabled (25.000000 Watts, 1.000000 sec, clamp
>> DISabled)
>> cpu0: PKG Limit #2: DISabled (15.000000 Watts, 0.002441* sec, clamp
>> DISabled)
>> cpu0: MSR_PP0_POLICY: 0
>> cpu0: MSR_PP0_POWER_LIMIT: 0x00000000 (UNlocked)
>> cpu0: Cores Limit: DISabled (0.000000 Watts, 0.000977 sec, clamp
>> DISabled)
>> cpu0: MSR_PP1_POLICY: 0
>> cpu0: MSR_PP1_POWER_LIMIT: 0x00000000 (UNlocked)
>> cpu0: GFX Limit: DISabled (0.000000 Watts, 0.000977 sec, clamp
>> DISabled)
>> cpu0: MSR_IA32_TEMPERATURE_TARGET: 0x00640000 (100 C)
>> cpu0: MSR_IA32_PACKAGE_THERM_STATUS: 0x882d0808 (55 C)
>> cpu0: MSR_IA32_PACKAGE_THERM_INTERRUPT: 0x00000003 (100 C, 100 C)
>> cpu0: MSR_IA32_THERM_STATUS: 0x882d0808 (55 C +/- 1)
>> cpu0: MSR_IA32_THERM_INTERRUPT: 0x00000013 (100 C, 100 C)
>> cpu2: MSR_IA32_THERM_STATUS: 0x88300808 (52 C +/- 1)
>> cpu2: MSR_IA32_THERM_INTERRUPT: 0x00000013 (100 C, 100 C)
>> cpu0: MSR_PKGC3_IRTL: 0x00008842 (valid, 67584 ns)
>> cpu0: MSR_PKGC6_IRTL: 0x00008873 (valid, 117760 ns)
>> cpu0: MSR_PKGC7_IRTL: 0x00008891 (valid, 148480 ns)
>> cpu0: MSR_PKGC8_IRTL: 0x000088e4 (valid, 233472 ns)
>> cpu0: MSR_PKGC9_IRTL: 0x00008945 (valid, 332800 ns)
>> cpu0: MSR_PKGC10_IRTL: 0x00009003 (valid, 3 ns)
>>
>>
>> And this is what I get after I unplug the laptop:
>>
>> turbostat version 18.06.20 - Len Brown <lenb@kernel.org>
>> CPUID(0): GenuineIntel 13 CPUID levels; family:model:stepping
>> 0x6:45:1 (6:69:1)
>> CPUID(1): SSE3 MONITOR - EIST TM2 TSC MSR ACPI-TM HT TM
>> CPUID(6): APERF, No-TURBO, DTS, PTM, No-HWP, No-HWPnotify, No-
>> HWPwindow, No-HWPepp, No-HWPpkg, EPB
>> cpu3: MSR_IA32_MISC_ENABLE: 0x4000850089 (TCC EIST MWAIT PREFETCH No-
>> TURBO)
>> CPUID(7): No-SGX
>> cpu3: MSR_MISC_PWR_MGMT: 0x00400000 (ENable-EIST_Coordination
>> DISable-EPB DISable-OOB)
>> RAPL: 17476 sec. Joule Counter Range, at 15 Watts
>> cpu3: MSR_PLATFORM_INFO: 0x8083df3011800
>> 8 * 100.0 = 800.0 MHz max efficiency frequency
>> 24 * 100.0 = 2400.0 MHz base frequency
>> cpu3: MSR_IA32_POWER_CTL: 0x0004005d (C1E auto-promotion: DISabled)
>> cpu3: MSR_TURBO_RATIO_LIMIT: 0x1b1b1b1e
>> 27 * 100.0 = 2700.0 MHz max turbo 4 active cores
>> 27 * 100.0 = 2700.0 MHz max turbo 3 active cores
>> 27 * 100.0 = 2700.0 MHz max turbo 2 active cores
>> 30 * 100.0 = 3000.0 MHz max turbo 1 active cores
>> cpu3: MSR_CONFIG_TDP_NOMINAL: 0x00000012 (base_ratio=18)
>> cpu3: MSR_CONFIG_TDP_LEVEL_1: 0x0008005c (PKG_MIN_PWR_LVL1=0
>> PKG_MAX_PWR_LVL1=0 LVL1_RATIO=8 PKG_TDP_LVL1=92)
>> cpu3: MSR_CONFIG_TDP_LEVEL_2: 0x001800c8 (PKG_MIN_PWR_LVL2=0
>> PKG_MAX_PWR_LVL2=0 LVL2_RATIO=24 PKG_TDP_LVL2=200)
>> cpu3: MSR_CONFIG_TDP_CONTROL: 0x00000000 ( lock=0)
>> cpu3: MSR_TURBO_ACTIVATION_RATIO: 0x00000011 (MAX_NON_TURBO_RATIO=17
>> lock=0)
>> cpu3: MSR_PKG_CST_CONFIG_CONTROL: 0x1e008407 (UNdemote-C3, UNdemote-
>> C1, demote-C3, demote-C1, locked, pkg-cstate-limit=7 (pc9))
>> cpu3: POLL: CPUIDLE CORE POLL IDLE
>> cpu3: C1: MWAIT 0x00
>> cpu3: C1E: MWAIT 0x01
>> cpu3: C3: MWAIT 0x10
>> cpu3: C6: MWAIT 0x20
>> cpu3: C7s: MWAIT 0x32
>> cpu3: C8: MWAIT 0x40
>> cpu3: C9: MWAIT 0x50
>> cpu3: C10: MWAIT 0x60
>> cpu3: cpufreq driver: intel_pstate
>> cpu3: cpufreq governor: powersave
>> cpufreq intel_pstate no_turbo: 1
>> cpu3: MSR_MISC_FEATURE_CONTROL: 0x00000000 (L2-Prefetch L2-Prefetch-
>> pair L1-Prefetch L1-IP-Prefetch)
>> cpu0: MSR_IA32_ENERGY_PERF_BIAS: 0x00000006 (balanced)
>> cpu0: MSR_CORE_PERF_LIMIT_REASONS, 0x1d210000 (Active: ) (Logged:
>> MultiCoreTurbo, PkgPwrL2, PkgPwrL1, Amps, Auto-HWP, PROCHOT, )
>> cpu0: MSR_GFX_PERF_LIMIT_REASONS, 0x1c010000 (Active: ) (Logged:
>> PROCHOT, PkgPwrL1, PkgPwrL2, )
>> cpu0: MSR_RING_PERF_LIMIT_REASONS, 0x0d010000 (Active: ) (Logged:
>> PROCHOT, Amps, PkgPwrL1, PkgPwrL2, )
>> cpu0: MSR_RAPL_POWER_UNIT: 0x000a0e03 (0.125000 Watts, 0.000061
>> Joules, 0.000977 sec.)
>> cpu0: MSR_PKG_POWER_INFO: 0x00000078 (15 W TDP, RAPL 0 - 0 W,
>> 0.000000 sec.)
>> cpu0: MSR_PKG_POWER_LIMIT: 0x420078001480c8 (UNlocked)
>> cpu0: PKG Limit #1: ENabled (25.000000 Watts, 1.000000 sec, clamp
>> DISabled)
>> cpu0: PKG Limit #2: DISabled (15.000000 Watts, 0.002441* sec, clamp
>> DISabled)
>> cpu0: MSR_PP0_POLICY: 0
>> cpu0: MSR_PP0_POWER_LIMIT: 0x00000000 (UNlocked)
>> cpu0: Cores Limit: DISabled (0.000000 Watts, 0.000977 sec, clamp
>> DISabled)
>> cpu0: MSR_PP1_POLICY: 0
>> cpu0: MSR_PP1_POWER_LIMIT: 0x00000000 (UNlocked)
>> cpu0: GFX Limit: DISabled (0.000000 Watts, 0.000977 sec, clamp
>> DISabled)
>> cpu0: MSR_IA32_TEMPERATURE_TARGET: 0x00640000 (100 C)
>> cpu0: MSR_IA32_PACKAGE_THERM_STATUS: 0x882f0808 (53 C)
>> cpu0: MSR_IA32_PACKAGE_THERM_INTERRUPT: 0x00000003 (100 C, 100 C)
>> cpu0: MSR_IA32_THERM_STATUS: 0x882f0808 (53 C +/- 1)
>> cpu0: MSR_IA32_THERM_INTERRUPT: 0x00000013 (100 C, 100 C)
>> cpu2: MSR_IA32_THERM_STATUS: 0x88300808 (52 C +/- 1)
>> cpu2: MSR_IA32_THERM_INTERRUPT: 0x00000013 (100 C, 100 C)
>> cpu3: MSR_PKGC3_IRTL: 0x00008842 (valid, 67584 ns)
>> cpu3: MSR_PKGC6_IRTL: 0x00008873 (valid, 117760 ns)
>> cpu3: MSR_PKGC7_IRTL: 0x00008891 (valid, 148480 ns)
>> cpu3: MSR_PKGC8_IRTL: 0x000088e4 (valid, 233472 ns)
>> cpu3: MSR_PKGC9_IRTL: 0x00008945 (valid, 332800 ns)
>> cpu3: MSR_PKGC10_IRTL: 0x00009003 (valid, 3 ns)
>>
>>
>> MSR_CORE_PERF_LIMIT_REASONS seems to have a different value
>> when plugged in depending on how the laptop booted. I don't
>> know if this is relevant, but this is what I noticed.
>>
>> Right after a reboot while plugged in, I get:
>> cpu0: MSR_CORE_PERF_LIMIT_REASONS, 0x1d201000 (Active:
>> MultiCoreTurbo, ) (Logged: MultiCoreTurbo, PkgPwrL2, PkgPwrL1, Amps,
>> Auto-HWP, )
>> If unplug and replug, I get:
>> cpu0: MSR_CORE_PERF_LIMIT_REASONS, 0x1d210020 (Active: Auto-HWP, )
>> (Logged: MultiCoreTurbo, PkgPwrL2, PkgPwrL1, Amps, Auto-HWP, PROCHOT,
>> )
>>
>> If the laptop booted while unplgged, I constantly get:
>> cpu0: MSR_CORE_PERF_LIMIT_REASONS, 0x14000000 (Active: ) (Logged:
>> MultiCoreTurbo, PkgPwrL1, )
>>
>>
>>> Also output of acpidump?
>>
>> You can find it here:
>> https://bugzilla.kernel.org/attachment.cgi?id=178381
>>
>>>
>>>> Plugged -> Unplugged:
>>>>
>>>> [   40.046116] CPU 0: _PPC is 6 - frequency  limited
>>>> [   40.046128] intel_pstate: policy->max > max non turbo
>>>> frequency
>>>> [   40.046131] intel_pstate: set_policy cpuinfo.max 3000000
>>>> policy-
>>>>> max 3000000
>>>>
>>>> [   40.046134] intel_pstate: cpu:0 max_state 30 min_policy_perf:8
>>>> max_policy_perf:30
>>>> [   40.046137] intel_pstate: cpu:0 global_min:8 global_max:30
>>>> [   40.046140] intel_pstate: cpu:0 max_perf_ratio:30
>>>> min_perf_ratio:8
>>>> [   40.162173] CPU 0: _PPC is 6 - frequency  limited
>>>> [   40.162186] intel_pstate: policy->max > max non turbo
>>>> frequency
>>>> [   40.162190] intel_pstate: set_policy cpuinfo.max 3000000
>>>> policy-
>>>>> max 3000000
>>>>
>>>> [   40.162194] intel_pstate: cpu:0 max_state 30 min_policy_perf:8
>>>> max_policy_perf:30
>>>> [   40.162197] intel_pstate: cpu:0 global_min:8 global_max:30
>>>> [   40.162200] intel_pstate: cpu:0 max_perf_ratio:30
>>>> min_perf_ratio:8
>>>> [   40.162215] CPU 0: _PPC is 6 - frequency  limited
>>>> [   40.162220] intel_pstate: policy->max > max non turbo
>>>> frequency
>>>> [   40.162223] intel_pstate: set_policy cpuinfo.max 3000000
>>>> policy-
>>>>> max 3000000
>>>>
>>>> [   40.162226] intel_pstate: cpu:0 max_state 30 min_policy_perf:8
>>>> max_policy_perf:30
>>>> [   40.162228] intel_pstate: cpu:0 global_min:8 global_max:30
>>>> [   40.162230] intel_pstate: cpu:0 max_perf_ratio:30
>>>> min_perf_ratio:8
>>>> [   40.162237] CPU 0: _PPC is 6 - frequency  limited
>>>> [   40.162241] intel_pstate: policy->max > max non turbo
>>>> frequency
>>>> [   40.162243] intel_pstate: set_policy cpuinfo.max 3000000
>>>> policy-
>>>>> max 3000000
>>>>
>>>> [   40.162245] intel_pstate: cpu:0 max_state 30 min_policy_perf:8
>>>> max_policy_perf:30
>>>> [   40.162247] intel_pstate: cpu:0 global_min:8 global_max:30
>>>> [   40.162249] intel_pstate: cpu:0 max_perf_ratio:30
>>>> min_perf_ratio:8
>>>> [   40.162257] CPU 0: _PPC is 6 - frequency  limited
>>>> [   40.162261] intel_pstate: policy->max > max non turbo
>>>> frequency
>>>> [   40.162263] intel_pstate: set_policy cpuinfo.max 3000000
>>>> policy-
>>>>> max 3000000
>>>>
>>>> [   40.162265] intel_pstate: cpu:0 max_state 30 min_policy_perf:8
>>>> max_policy_perf:30
>>>> [   40.162267] intel_pstate: cpu:0 global_min:8 global_max:30
>>>> [   40.162269] intel_pstate: cpu:0 max_perf_ratio:30
>>>> min_perf_ratio:8
>>>>
>>>> Unplugged -> Plugged:
>>>>
>>>> [   52.648535] CPU 0: _PPC is 6 - frequency  limited
>>>> [   52.648553] intel_pstate: set_policy cpuinfo.max 3000000
>>>> policy-
>>>>> max 1700000
>>>>
>>>> [   52.648558] intel_pstate: cpu:0 max_state 17 min_policy_perf:8
>>>> max_policy_perf:17
>>>> [   52.648562] intel_pstate: cpu:0 global_min:8 global_max:30
>>>> [   52.648566] intel_pstate: cpu:0 max_perf_ratio:17
>>>> min_perf_ratio:8
>>>> [   52.648583] CPU 0: _PPC is 6 - frequency  limited
>>>> [   52.648590] intel_pstate: set_policy cpuinfo.max 3000000
>>>> policy-
>>>>> max 1700000
>>>>
>>>> [   52.648595] intel_pstate: cpu:0 max_state 17 min_policy_perf:8
>>>> max_policy_perf:17
>>>> [   52.648598] intel_pstate: cpu:0 global_min:8 global_max:30
>>>> [   52.648602] intel_pstate: cpu:0 max_perf_ratio:17
>>>> min_perf_ratio:8
>>>> [   52.656093] CPU 0: _PPC is 6 - frequency  limited
>>>> [   52.656111] intel_pstate: set_policy cpuinfo.max 3000000
>>>> policy-
>>>>> max 1700000
>>>>
>>>> [   52.656116] intel_pstate: cpu:0 max_state 17 min_policy_perf:8
>>>> max_policy_perf:17
>>>> [   52.656120] intel_pstate: cpu:0 global_min:8 global_max:30
>>>> [   52.656123] intel_pstate: cpu:0 max_perf_ratio:17
>>>> min_perf_ratio:8
>>>> [   52.775577] CPU 0: _PPC is 6 - frequency  limited
>>>> [   52.775594] intel_pstate: set_policy cpuinfo.max 3000000
>>>> policy-
>>>>> max 1700000
>>>>
>>>> [   52.775598] intel_pstate: cpu:0 max_state 17 min_policy_perf:8
>>>> max_policy_perf:17
>>>> [   52.775601] intel_pstate: cpu:0 global_min:8 global_max:30
>>>> [   52.775604] intel_pstate: cpu:0 max_perf_ratio:17
>>>> min_perf_ratio:8
>>>> [   53.028620] CPU 0: _PPC is 6 - frequency  limited
>>>> [   53.028637] intel_pstate: set_policy cpuinfo.max 3000000
>>>> policy-
>>>>> max 1700000
>>>>
>>>> [   53.028643] intel_pstate: cpu:0 max_state 17 min_policy_perf:8
>>>> max_policy_perf:17
>>>> [   53.028647] intel_pstate: cpu:0 global_min:8 global_max:30
>>>> [   53.028651] intel_pstate: cpu:0 max_perf_ratio:17
>>>> min_perf_ratio:8
>>>>
>>>>> and send dmesg after you change power sources.
>>>>>
>>>>> - Also try with
>>>>> intel_pstate=disable dyndbg="file processor_perflib.c +p"
>>>>
>>>> Nothing gets printed with this one.
>>>>
>>>> Thanks,
>>>> Gabriele
>>>>
>>>>> and send dmesg.
>>>>>
>>>>> Thanks,
>>>>> Srinivas
>>>>>
>>>>>