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Date: Wed, 05 Jun 2024 13:21:38 +0800
From: Xi Ruoyao <xry111@...111.site>
To: srinivas pandruvada <srinivas.pandruvada@...ux.intel.com>, "Rafael J.
Wysocki" <rafael@...nel.org>
Cc: "Rafael J. Wysocki" <rjw@...ysocki.net>, Linux PM
<linux-pm@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1 2/6] cpufreq: intel_pstate: Do not update
global.turbo_disabled after initialization
On Tue, 2024-06-04 at 09:56 -0700, srinivas pandruvada wrote:
> > > With such a delay, I am not sure how this even worked before.
It didn't work out of box but it worked after manually writing 0 to
no_turbo after 20 seconds, see
https://bugzilla.kernel.org/show_bug.cgi?id=218702.
> > > Can you revert the patch in question and use kernel dynamic debug
> > > dyndbg="file intel_pstate.c +p" kernel command line and collect log
> > > for
> > > 30 seconds?
Attached. The related part seems:
[ 0.553606] intel_pstate: Intel P-state driver initializing
[ 0.553630] intel_pstate: controlling: cpu 0
[ 0.553640] intel_pstate: set_policy cpuinfo.max 3100000 policy->max 3100000
[ 0.553642] intel_pstate: cpu:0 min_policy_perf:4 max_policy_perf:31
[ 0.553643] intel_pstate: cpu:0 global_min:0 global_max:44
[ 0.553644] intel_pstate: cpu:0 max_perf_ratio:31 min_perf_ratio:4
[ 0.553680] intel_pstate: controlling: cpu 1
[ 0.553702] intel_pstate: set_policy cpuinfo.max 3100000 policy->max 3100000
[ 0.553703] intel_pstate: cpu:1 min_policy_perf:4 max_policy_perf:31
[ 0.553704] intel_pstate: cpu:1 global_min:0 global_max:44
[ 0.553705] intel_pstate: cpu:1 max_perf_ratio:31 min_perf_ratio:4
[ 0.553742] intel_pstate: controlling: cpu 2
[ 0.553763] intel_pstate: set_policy cpuinfo.max 3100000 policy->max 3100000
[ 0.553764] intel_pstate: cpu:2 min_policy_perf:4 max_policy_perf:31
[ 0.553765] intel_pstate: cpu:2 global_min:0 global_max:44
[ 0.553766] intel_pstate: cpu:2 max_perf_ratio:31 min_perf_ratio:4
[ 0.553809] intel_pstate: controlling: cpu 3
[ 0.553830] intel_pstate: set_policy cpuinfo.max 3100000 policy->max 3100000
[ 0.553831] intel_pstate: cpu:3 min_policy_perf:4 max_policy_perf:31
[ 0.553831] intel_pstate: cpu:3 global_min:0 global_max:44
[ 0.553832] intel_pstate: cpu:3 max_perf_ratio:31 min_perf_ratio:4
[ 0.553868] intel_pstate: controlling: cpu 4
[ 0.553892] intel_pstate: set_policy cpuinfo.max 3100000 policy->max 3100000
[ 0.553893] intel_pstate: cpu:4 min_policy_perf:4 max_policy_perf:31
[ 0.553894] intel_pstate: cpu:4 global_min:0 global_max:44
[ 0.553895] intel_pstate: cpu:4 max_perf_ratio:31 min_perf_ratio:4
[ 0.553943] intel_pstate: controlling: cpu 5
[ 0.553967] intel_pstate: set_policy cpuinfo.max 3100000 policy->max 3100000
[ 0.553968] intel_pstate: cpu:5 min_policy_perf:4 max_policy_perf:31
[ 0.553968] intel_pstate: cpu:5 global_min:0 global_max:44
[ 0.553969] intel_pstate: cpu:5 max_perf_ratio:31 min_perf_ratio:4
[ 0.554009] intel_pstate: controlling: cpu 6
[ 0.554034] intel_pstate: set_policy cpuinfo.max 3100000 policy->max 3100000
[ 0.554035] intel_pstate: cpu:6 min_policy_perf:4 max_policy_perf:31
[ 0.554036] intel_pstate: cpu:6 global_min:0 global_max:44
[ 0.554037] intel_pstate: cpu:6 max_perf_ratio:31 min_perf_ratio:4
[ 0.554077] intel_pstate: controlling: cpu 7
[ 0.554098] intel_pstate: set_policy cpuinfo.max 3100000 policy->max 3100000
[ 0.554099] intel_pstate: cpu:7 min_policy_perf:4 max_policy_perf:31
[ 0.554099] intel_pstate: cpu:7 global_min:0 global_max:44
[ 0.554100] intel_pstate: cpu:7 max_perf_ratio:31 min_perf_ratio:4
[ 0.554104] intel_pstate: HWP enabled
[ 2.183669] intel_pstate: set_policy cpuinfo.max 3100000 policy->max 3100000
[ 2.183675] intel_pstate: cpu:6 min_policy_perf:4 max_policy_perf:31
[ 2.183677] intel_pstate: cpu:6 global_min:4 global_max:44
[ 2.183679] intel_pstate: cpu:6 max_perf_ratio:31 min_perf_ratio:4
[ 2.183710] intel_pstate: set_policy cpuinfo.max 3100000 policy->max 3100000
[ 2.183711] intel_pstate: cpu:4 min_policy_perf:4 max_policy_perf:31
[ 2.183713] intel_pstate: cpu:4 global_min:4 global_max:44
[ 2.183715] intel_pstate: cpu:4 max_perf_ratio:31 min_perf_ratio:4
[ 2.183742] intel_pstate: set_policy cpuinfo.max 3100000 policy->max 3100000
[ 2.183744] intel_pstate: cpu:2 min_policy_perf:4 max_policy_perf:31
[ 2.183745] intel_pstate: cpu:2 global_min:4 global_max:44
[ 2.183747] intel_pstate: cpu:2 max_perf_ratio:31 min_perf_ratio:4
[ 2.183773] intel_pstate: set_policy cpuinfo.max 3100000 policy->max 3100000
[ 2.183775] intel_pstate: cpu:0 min_policy_perf:4 max_policy_perf:31
[ 2.183776] intel_pstate: cpu:0 global_min:4 global_max:44
[ 2.183777] intel_pstate: cpu:0 max_perf_ratio:31 min_perf_ratio:4
[ 2.183803] intel_pstate: set_policy cpuinfo.max 3100000 policy->max 3100000
[ 2.183805] intel_pstate: cpu:7 min_policy_perf:4 max_policy_perf:31
[ 2.183806] intel_pstate: cpu:7 global_min:4 global_max:44
[ 2.183807] intel_pstate: cpu:7 max_perf_ratio:31 min_perf_ratio:4
[ 2.183831] intel_pstate: set_policy cpuinfo.max 3100000 policy->max 3100000
[ 2.183833] intel_pstate: cpu:5 min_policy_perf:4 max_policy_perf:31
[ 2.183834] intel_pstate: cpu:5 global_min:4 global_max:44
[ 2.183836] intel_pstate: cpu:5 max_perf_ratio:31 min_perf_ratio:4
[ 2.183862] intel_pstate: set_policy cpuinfo.max 3100000 policy->max 3100000
[ 2.183864] intel_pstate: cpu:3 min_policy_perf:4 max_policy_perf:31
[ 2.183865] intel_pstate: cpu:3 global_min:4 global_max:44
[ 2.183867] intel_pstate: cpu:3 max_perf_ratio:31 min_perf_ratio:4
[ 2.183893] intel_pstate: set_policy cpuinfo.max 3100000 policy->max 3100000
[ 2.183895] intel_pstate: cpu:1 min_policy_perf:4 max_policy_perf:31
[ 2.183896] intel_pstate: cpu:1 global_min:4 global_max:44
[ 2.183898] intel_pstate: cpu:1 max_perf_ratio:31 min_perf_ratio:4
> > I think that it worked because the MSR was read every time
> > intel_pstate ran, so it got updated at one point and stayed that way.
>
> But here HWP in active mode is getting used. So it should have fewer
> request calls to set accept via cpufreq set_policy()
>
> callback or with some HWP interrupt.
--
Xi Ruoyao <xry111@...111.site>
School of Aerospace Science and Technology, Xidian University
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