linux-kernel - Re: [PATCH v1 1/2] cpufreq: intel_pstate: Use CPPC to get scaling factors

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Message-ID: <9a06fec4970bfbd294ad80dceaa7ec12f0869587.camel@linux.intel.com>
Date: Thu, 01 May 2025 16:12:26 -0700
From: srinivas pandruvada <srinivas.pandruvada@...ux.intel.com>
To: Russell Haley <yumpusamongus@...il.com>, "Rafael J. Wysocki"
	 <rjw@...ysocki.net>, Linux PM <linux-pm@...r.kernel.org>
Cc: LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1 1/2] cpufreq: intel_pstate: Use CPPC to get scaling
 factors

On Thu, 2025-05-01 at 16:33 -0500, Russell Haley wrote:
> 
> On 5/1/25 12:13 PM, srinivas pandruvada wrote:
> > Hi Russell,
> > 
> > 
> > On Wed, 2025-04-30 at 20:28 -0500, Russell Haley wrote:
> > > 
> > > On 12/5/24 5:39 AM, Rafael J. Wysocki wrote:
> > > 
> > > > +	 * Compute the perf-to-frequency scaling factor for
> > > > the
> > > > given CPU if
> > > > +	 * possible, unless it would be 0.
> > > > +	 */
> > > > +	if (!cppc_get_perf_caps(cpu, &cppc_perf) &&
> > > > +	    cppc_perf.nominal_perf && cppc_perf.nominal_freq)
> > > > +		return div_u64(cppc_perf.nominal_freq *
> > > > KHZ_PER_MHZ,
> > > > +			       cppc_perf.nominal_perf);
> > > 
> > Can you dump the output of
> > 
> >  grep -r . /sys/devices/system/cpu/cpu*/acpi_cppc/
> > 

For Intel® Core™ Ultra 7 Processor 265K as per spec:

Based on this CPU 0-7 are performance-cores. So there max frequency is
correct.
That can be 5.5 GHz or 5.4 GHz.

CPU 8-19 are Efficient cores
There max can be 4.6 GHz, except CPU 12, 13. 4.6 GHz also match the
spec.
The max perf raw value is 65. That is also correct.
The nominal freq of all is 3300 MHz, that is also correct for all.
Except for CPU 12 and 13 the nominal perf is 46.

I expect that nominal perf value of 12, 13 should be same as other
efficient cores. But here it is not same.

Let me check if I can find some contact of Asrock to see why is this
case.

Thanks,
Srinivas


> > Thanks,
> > Srinivas
> 

> Running microcode 0x117, CSME firmware 19.0.5.1948, shipped in BIOS
> 3.04
> on an ASRock Z890 Pro-A Wifi motherboard:
> 
> > /sys/devices/system/cpu/cpu0/acpi_cppc/feedback_ctrs:ref:1273162075
> > 77 del:142876300546
> > /sys/devices/system/cpu/cpu0/acpi_cppc/lowest_nonlinear_perf:36
> > /sys/devices/system/cpu/cpu0/acpi_cppc/highest_perf:87
> > /sys/devices/system/cpu/cpu0/acpi_cppc/nominal_freq:3900
> > /sys/devices/system/cpu/cpu0/acpi_cppc/lowest_freq:0
> > /sys/devices/system/cpu/cpu0/acpi_cppc/guaranteed_perf:63
> > /sys/devices/system/cpu/cpu0/acpi_cppc/nominal_perf:62
> > /sys/devices/system/cpu/cpu0/acpi_cppc/lowest_perf:1
> > /sys/devices/system/cpu/cpu0/acpi_cppc/reference_perf:62
> > /sys/devices/system/cpu/cpu0/acpi_cppc/wraparound_time:184467440737
> > 09551615
> > /sys/devices/system/cpu/cpu1/acpi_cppc/feedback_ctrs:ref:3080604891
> > 0 del:37298826546
> > /sys/devices/system/cpu/cpu1/acpi_cppc/lowest_nonlinear_perf:36
> > /sys/devices/system/cpu/cpu1/acpi_cppc/highest_perf:88
> > /sys/devices/system/cpu/cpu1/acpi_cppc/nominal_freq:3900
> > /sys/devices/system/cpu/cpu1/acpi_cppc/lowest_freq:0
> > /sys/devices/system/cpu/cpu1/acpi_cppc/guaranteed_perf:63
> > /sys/devices/system/cpu/cpu1/acpi_cppc/nominal_perf:62
> > /sys/devices/system/cpu/cpu1/acpi_cppc/lowest_perf:1
> > /sys/devices/system/cpu/cpu1/acpi_cppc/reference_perf:62
> > /sys/devices/system/cpu/cpu1/acpi_cppc/wraparound_time:184467440737
> > 09551615
> > /sys/devices/system/cpu/cpu2/acpi_cppc/feedback_ctrs:ref:3010485691
> > 2 del:37149315858
> > /sys/devices/system/cpu/cpu2/acpi_cppc/lowest_nonlinear_perf:36
> > /sys/devices/system/cpu/cpu2/acpi_cppc/highest_perf:87
> > /sys/devices/system/cpu/cpu2/acpi_cppc/nominal_freq:3900
> > /sys/devices/system/cpu/cpu2/acpi_cppc/lowest_freq:0
> > /sys/devices/system/cpu/cpu2/acpi_cppc/guaranteed_perf:63
> > /sys/devices/system/cpu/cpu2/acpi_cppc/nominal_perf:62
> > /sys/devices/system/cpu/cpu2/acpi_cppc/lowest_perf:1
> > /sys/devices/system/cpu/cpu2/acpi_cppc/reference_perf:62
> > /sys/devices/system/cpu/cpu2/acpi_cppc/wraparound_time:184467440737
> > 09551615
> > /sys/devices/system/cpu/cpu3/acpi_cppc/feedback_ctrs:ref:2886479247
> > 6 del:36395338959
> > /sys/devices/system/cpu/cpu3/acpi_cppc/lowest_nonlinear_perf:36
> > /sys/devices/system/cpu/cpu3/acpi_cppc/highest_perf:87
> > /sys/devices/system/cpu/cpu3/acpi_cppc/nominal_freq:3900
> > /sys/devices/system/cpu/cpu3/acpi_cppc/lowest_freq:0
> > /sys/devices/system/cpu/cpu3/acpi_cppc/guaranteed_perf:63
> > /sys/devices/system/cpu/cpu3/acpi_cppc/nominal_perf:62
> > /sys/devices/system/cpu/cpu3/acpi_cppc/lowest_perf:1
> > /sys/devices/system/cpu/cpu3/acpi_cppc/reference_perf:62
> > /sys/devices/system/cpu/cpu3/acpi_cppc/wraparound_time:184467440737
> > 09551615
> > /sys/devices/system/cpu/cpu4/acpi_cppc/feedback_ctrs:ref:2959129937
> > 4 del:35708084379
> > /sys/devices/system/cpu/cpu4/acpi_cppc/lowest_nonlinear_perf:36
> > /sys/devices/system/cpu/cpu4/acpi_cppc/highest_perf:87
> > /sys/devices/system/cpu/cpu4/acpi_cppc/nominal_freq:3900
> > /sys/devices/system/cpu/cpu4/acpi_cppc/lowest_freq:0
> > /sys/devices/system/cpu/cpu4/acpi_cppc/guaranteed_perf:63
> > /sys/devices/system/cpu/cpu4/acpi_cppc/nominal_perf:62
> > /sys/devices/system/cpu/cpu4/acpi_cppc/lowest_perf:1
> > /sys/devices/system/cpu/cpu4/acpi_cppc/reference_perf:62
> > /sys/devices/system/cpu/cpu4/acpi_cppc/wraparound_time:184467440737
> > 09551615
> > /sys/devices/system/cpu/cpu5/acpi_cppc/feedback_ctrs:ref:2734735138
> > 2 del:35000915045
> > /sys/devices/system/cpu/cpu5/acpi_cppc/lowest_nonlinear_perf:36
> > /sys/devices/system/cpu/cpu5/acpi_cppc/highest_perf:87
> > /sys/devices/system/cpu/cpu5/acpi_cppc/nominal_freq:3900
> > /sys/devices/system/cpu/cpu5/acpi_cppc/lowest_freq:0
> > /sys/devices/system/cpu/cpu5/acpi_cppc/guaranteed_perf:63
> > /sys/devices/system/cpu/cpu5/acpi_cppc/nominal_perf:62
> > /sys/devices/system/cpu/cpu5/acpi_cppc/lowest_perf:1
> > /sys/devices/system/cpu/cpu5/acpi_cppc/reference_perf:62
> > /sys/devices/system/cpu/cpu5/acpi_cppc/wraparound_time:184467440737
> > 09551615
> > /sys/devices/system/cpu/cpu6/acpi_cppc/feedback_ctrs:ref:2811773788
> > 2 del:34854014824
> > /sys/devices/system/cpu/cpu6/acpi_cppc/lowest_nonlinear_perf:36
> > /sys/devices/system/cpu/cpu6/acpi_cppc/highest_perf:87
> > /sys/devices/system/cpu/cpu6/acpi_cppc/nominal_freq:3900
> > /sys/devices/system/cpu/cpu6/acpi_cppc/lowest_freq:0
> > /sys/devices/system/cpu/cpu6/acpi_cppc/guaranteed_perf:63
> > /sys/devices/system/cpu/cpu6/acpi_cppc/nominal_perf:62
> > /sys/devices/system/cpu/cpu6/acpi_cppc/lowest_perf:1
> > /sys/devices/system/cpu/cpu6/acpi_cppc/reference_perf:62
> > /sys/devices/system/cpu/cpu6/acpi_cppc/wraparound_time:184467440737
> > 09551615
> > /sys/devices/system/cpu/cpu7/acpi_cppc/feedback_ctrs:ref:2958635916
> > 6 del:36871078184
> > /sys/devices/system/cpu/cpu7/acpi_cppc/lowest_nonlinear_perf:36
> > /sys/devices/system/cpu/cpu7/acpi_cppc/highest_perf:88
> > /sys/devices/system/cpu/cpu7/acpi_cppc/nominal_freq:3900
> > /sys/devices/system/cpu/cpu7/acpi_cppc/lowest_freq:0
> > /sys/devices/system/cpu/cpu7/acpi_cppc/guaranteed_perf:63
> > /sys/devices/system/cpu/cpu7/acpi_cppc/nominal_perf:62
> > /sys/devices/system/cpu/cpu7/acpi_cppc/lowest_perf:1
> > /sys/devices/system/cpu/cpu7/acpi_cppc/reference_perf:62
> > /sys/devices/system/cpu/cpu7/acpi_cppc/wraparound_time:184467440737
> > 09551615
> > /sys/devices/system/cpu/cpu8/acpi_cppc/feedback_ctrs:ref:2880811533
> > 6 del:32798153181
> > /sys/devices/system/cpu/cpu8/acpi_cppc/lowest_nonlinear_perf:21
> > /sys/devices/system/cpu/cpu8/acpi_cppc/highest_perf:65
> > /sys/devices/system/cpu/cpu8/acpi_cppc/nominal_freq:3300
> > /sys/devices/system/cpu/cpu8/acpi_cppc/lowest_freq:0
> > /sys/devices/system/cpu/cpu8/acpi_cppc/guaranteed_perf:47
> > /sys/devices/system/cpu/cpu8/acpi_cppc/nominal_perf:46
> > /sys/devices/system/cpu/cpu8/acpi_cppc/lowest_perf:1
> > /sys/devices/system/cpu/cpu8/acpi_cppc/reference_perf:54
> > /sys/devices/system/cpu/cpu8/acpi_cppc/wraparound_time:184467440737
> > 09551615
> > /sys/devices/system/cpu/cpu9/acpi_cppc/feedback_ctrs:ref:2880844652
> > 4 del:32557156736
> > /sys/devices/system/cpu/cpu9/acpi_cppc/lowest_nonlinear_perf:21
> > /sys/devices/system/cpu/cpu9/acpi_cppc/highest_perf:65
> > /sys/devices/system/cpu/cpu9/acpi_cppc/nominal_freq:3300
> > /sys/devices/system/cpu/cpu9/acpi_cppc/lowest_freq:0
> > /sys/devices/system/cpu/cpu9/acpi_cppc/guaranteed_perf:47
> > /sys/devices/system/cpu/cpu9/acpi_cppc/nominal_perf:46
> > /sys/devices/system/cpu/cpu9/acpi_cppc/lowest_perf:1
> > /sys/devices/system/cpu/cpu9/acpi_cppc/reference_perf:54
> > /sys/devices/system/cpu/cpu9/acpi_cppc/wraparound_time:184467440737
> > 09551615
> > /sys/devices/system/cpu/cpu10/acpi_cppc/feedback_ctrs:ref:284668584
> > 72 del:32126528930
> > /sys/devices/system/cpu/cpu10/acpi_cppc/lowest_nonlinear_perf:21
> > /sys/devices/system/cpu/cpu10/acpi_cppc/highest_perf:65
> > /sys/devices/system/cpu/cpu10/acpi_cppc/nominal_freq:3300
> > /sys/devices/system/cpu/cpu10/acpi_cppc/lowest_freq:0
> > /sys/devices/system/cpu/cpu10/acpi_cppc/guaranteed_perf:47
> > /sys/devices/system/cpu/cpu10/acpi_cppc/nominal_perf:46
> > /sys/devices/system/cpu/cpu10/acpi_cppc/lowest_perf:1
> > /sys/devices/system/cpu/cpu10/acpi_cppc/reference_perf:54
> > /sys/devices/system/cpu/cpu10/acpi_cppc/wraparound_time:18446744073
> > 709551615
> > /sys/devices/system/cpu/cpu11/acpi_cppc/feedback_ctrs:ref:301586672
> > 40 del:34095663687
> > /sys/devices/system/cpu/cpu11/acpi_cppc/lowest_nonlinear_perf:21
> > /sys/devices/system/cpu/cpu11/acpi_cppc/highest_perf:65
> > /sys/devices/system/cpu/cpu11/acpi_cppc/nominal_freq:3300
> > /sys/devices/system/cpu/cpu11/acpi_cppc/lowest_freq:0
> > /sys/devices/system/cpu/cpu11/acpi_cppc/guaranteed_perf:47
> > /sys/devices/system/cpu/cpu11/acpi_cppc/nominal_perf:46
> > /sys/devices/system/cpu/cpu11/acpi_cppc/lowest_perf:1
> > /sys/devices/system/cpu/cpu11/acpi_cppc/reference_perf:54
> > /sys/devices/system/cpu/cpu11/acpi_cppc/wraparound_time:18446744073
> > 709551615
> > /sys/devices/system/cpu/cpu12/acpi_cppc/feedback_ctrs:ref:290567520
> > 36 del:33047611525
> > /sys/devices/system/cpu/cpu12/acpi_cppc/lowest_nonlinear_perf:21
> > /sys/devices/system/cpu/cpu12/acpi_cppc/highest_perf:65
> > /sys/devices/system/cpu/cpu12/acpi_cppc/nominal_freq:3300
> > /sys/devices/system/cpu/cpu12/acpi_cppc/lowest_freq:0
> > /sys/devices/system/cpu/cpu12/acpi_cppc/guaranteed_perf:47
> > /sys/devices/system/cpu/cpu12/acpi_cppc/nominal_perf:33
> > /sys/devices/system/cpu/cpu12/acpi_cppc/lowest_perf:1
> > /sys/devices/system/cpu/cpu12/acpi_cppc/reference_perf:39
> > /sys/devices/system/cpu/cpu12/acpi_cppc/wraparound_time:18446744073
> > 709551615
> > /sys/devices/system/cpu/cpu13/acpi_cppc/feedback_ctrs:ref:288689997
> > 96 del:32974873909
> > /sys/devices/system/cpu/cpu13/acpi_cppc/lowest_nonlinear_perf:21
> > /sys/devices/system/cpu/cpu13/acpi_cppc/highest_perf:65
> > /sys/devices/system/cpu/cpu13/acpi_cppc/nominal_freq:3300
> > /sys/devices/system/cpu/cpu13/acpi_cppc/lowest_freq:0
> > /sys/devices/system/cpu/cpu13/acpi_cppc/guaranteed_perf:47
> > /sys/devices/system/cpu/cpu13/acpi_cppc/nominal_perf:33
> > /sys/devices/system/cpu/cpu13/acpi_cppc/lowest_perf:1
> > /sys/devices/system/cpu/cpu13/acpi_cppc/reference_perf:39
> > /sys/devices/system/cpu/cpu13/acpi_cppc/wraparound_time:18446744073
> > 709551615
> > /sys/devices/system/cpu/cpu14/acpi_cppc/feedback_ctrs:ref:327543421
> > 92 del:33580705618
> > /sys/devices/system/cpu/cpu14/acpi_cppc/lowest_nonlinear_perf:21
> > /sys/devices/system/cpu/cpu14/acpi_cppc/highest_perf:65
> > /sys/devices/system/cpu/cpu14/acpi_cppc/nominal_freq:3300
> > /sys/devices/system/cpu/cpu14/acpi_cppc/lowest_freq:0
> > /sys/devices/system/cpu/cpu14/acpi_cppc/guaranteed_perf:47
> > /sys/devices/system/cpu/cpu14/acpi_cppc/nominal_perf:46
> > /sys/devices/system/cpu/cpu14/acpi_cppc/lowest_perf:1
> > /sys/devices/system/cpu/cpu14/acpi_cppc/reference_perf:54
> > /sys/devices/system/cpu/cpu14/acpi_cppc/wraparound_time:18446744073
> > 709551615
> > /sys/devices/system/cpu/cpu15/acpi_cppc/feedback_ctrs:ref:307564110
> > 36 del:33232643243
> > /sys/devices/system/cpu/cpu15/acpi_cppc/lowest_nonlinear_perf:21
> > /sys/devices/system/cpu/cpu15/acpi_cppc/highest_perf:65
> > /sys/devices/system/cpu/cpu15/acpi_cppc/nominal_freq:3300
> > /sys/devices/system/cpu/cpu15/acpi_cppc/lowest_freq:0
> > /sys/devices/system/cpu/cpu15/acpi_cppc/guaranteed_perf:47
> > /sys/devices/system/cpu/cpu15/acpi_cppc/nominal_perf:46
> > /sys/devices/system/cpu/cpu15/acpi_cppc/lowest_perf:1
> > /sys/devices/system/cpu/cpu15/acpi_cppc/reference_perf:54
> > /sys/devices/system/cpu/cpu15/acpi_cppc/wraparound_time:18446744073
> > 709551615
> > /sys/devices/system/cpu/cpu16/acpi_cppc/feedback_ctrs:ref:294303303
> > 84 del:32848376143
> > /sys/devices/system/cpu/cpu16/acpi_cppc/lowest_nonlinear_perf:21
> > /sys/devices/system/cpu/cpu16/acpi_cppc/highest_perf:65
> > /sys/devices/system/cpu/cpu16/acpi_cppc/nominal_freq:3300
> > /sys/devices/system/cpu/cpu16/acpi_cppc/lowest_freq:0
> > /sys/devices/system/cpu/cpu16/acpi_cppc/guaranteed_perf:47
> > /sys/devices/system/cpu/cpu16/acpi_cppc/nominal_perf:46
> > /sys/devices/system/cpu/cpu16/acpi_cppc/lowest_perf:1
> > /sys/devices/system/cpu/cpu16/acpi_cppc/reference_perf:54
> > /sys/devices/system/cpu/cpu16/acpi_cppc/wraparound_time:18446744073
> > 709551615
> > /sys/devices/system/cpu/cpu17/acpi_cppc/feedback_ctrs:ref:299978140
> > 80 del:33374419073
> > /sys/devices/system/cpu/cpu17/acpi_cppc/lowest_nonlinear_perf:21
> > /sys/devices/system/cpu/cpu17/acpi_cppc/highest_perf:65
> > /sys/devices/system/cpu/cpu17/acpi_cppc/nominal_freq:3300
> > /sys/devices/system/cpu/cpu17/acpi_cppc/lowest_freq:0
> > /sys/devices/system/cpu/cpu17/acpi_cppc/guaranteed_perf:47
> > /sys/devices/system/cpu/cpu17/acpi_cppc/nominal_perf:46
> > /sys/devices/system/cpu/cpu17/acpi_cppc/lowest_perf:1
> > /sys/devices/system/cpu/cpu17/acpi_cppc/reference_perf:54
> > /sys/devices/system/cpu/cpu17/acpi_cppc/wraparound_time:18446744073
> > 709551615
> > /sys/devices/system/cpu/cpu18/acpi_cppc/feedback_ctrs:ref:283124003
> > 76 del:32285787922
> > /sys/devices/system/cpu/cpu18/acpi_cppc/lowest_nonlinear_perf:21
> > /sys/devices/system/cpu/cpu18/acpi_cppc/highest_perf:65
> > /sys/devices/system/cpu/cpu18/acpi_cppc/nominal_freq:3300
> > /sys/devices/system/cpu/cpu18/acpi_cppc/lowest_freq:0
> > /sys/devices/system/cpu/cpu18/acpi_cppc/guaranteed_perf:47
> > /sys/devices/system/cpu/cpu18/acpi_cppc/nominal_perf:46
> > /sys/devices/system/cpu/cpu18/acpi_cppc/lowest_perf:1
> > /sys/devices/system/cpu/cpu18/acpi_cppc/reference_perf:54
> > /sys/devices/system/cpu/cpu18/acpi_cppc/wraparound_time:18446744073
> > 709551615
> > /sys/devices/system/cpu/cpu19/acpi_cppc/feedback_ctrs:ref:283166047
> > 32 del:32229146887
> > /sys/devices/system/cpu/cpu19/acpi_cppc/lowest_nonlinear_perf:21
> > /sys/devices/system/cpu/cpu19/acpi_cppc/highest_perf:65
> > /sys/devices/system/cpu/cpu19/acpi_cppc/nominal_freq:3300
> > /sys/devices/system/cpu/cpu19/acpi_cppc/lowest_freq:0
> > /sys/devices/system/cpu/cpu19/acpi_cppc/guaranteed_perf:47
> > /sys/devices/system/cpu/cpu19/acpi_cppc/nominal_perf:46
> > /sys/devices/system/cpu/cpu19/acpi_cppc/lowest_perf:1
> > /sys/devices/system/cpu/cpu19/acpi_cppc/reference_perf:54
> > /sys/devices/system/cpu/cpu19/acpi_cppc/wraparound_time:18446744073
> > 709551615
> 
> Thanks,
> 
> Russell
> 
>