* Re: intel-pstate driver not clocking down on Atom Z8750
[not found] ` <CAAYJcCXPUE78PBN_njrnHseBUOPXsek48ac4RGh5Jx_mgvYpKg@mail.gmail.com>
@ 2017-06-26 0:27 ` Srinivas Pandruvada
2017-06-26 21:22 ` Rafael J. Wysocki
0 siblings, 1 reply; 3+ messages in thread
From: Srinivas Pandruvada @ 2017-06-26 0:27 UTC (permalink / raw)
To: Christopher Williamson, Rafael J. Wysocki
Cc: lenb@kernel.org, viresh.kumar@linaro.org,
linux-pm@vger.kernel.org, Hans de Goede
[-- Attachment #1: Type: text/plain, Size: 1892 bytes --]
On Sun, 2017-06-25 at 18:37 -0400, Christopher Williamson wrote:
> 4.8 and 4.12-rc6
>
I just gave a quick test on a HP Cherrytrail laptop with 4.12 tip.
Attached is the output, which show that this does scale.
It is possible that you don't have any idle (C-states) or some task is
keeping system busy.
I suggest:
1. Run turbostat and attach output.
2. Attach output of tools/power/x86/intel_pstate_tracer for a minute
run.
Thanks,
Srinivas
> On Jun 25, 2017 at 10:24 PM, "Rafael J. Wysocki" <rjw@rjwysocki.net>
> wrote:
> > On Sunday, June 25, 2017 03:39:11 PM Christopher Williamson wrote:
> > > Hi there,
> > >
> > > I've just purchased a device called a "GPD Pocket" (more info at
> > > indiegogo.com/projects/gpd-pocket-7-0-umpc-laptop-ubuntu-or-win-
> > 10-os-laptop--2/x/7959405)
> > > but in short - one of the major problems I have with the device
> > is that the
> > > included Intel Atom Z8750 never clocks below the turbo boost
> > speed meaning
> > > it overheats very quickly and crashes.
> > >
> > > I have managed to avoid this behaviour in two ways:
> > >
> > > 1.) Disable turbo boost - the device then sits firmly at 1.6GHz
> > and refuses
> > > to clock below that.
> > >
> > > 2.) Disable the intel_pstate driver and the CPU then clocks
> > properly but
> > > cannot turbo boost at all so I lose that capability.
> > >
> > > I'm really just reaching out to you fine folks to find out where
> > best to
> > > discuss this issue. I'm happy to raise a kernel bug report if
> > that helps
> > > and also happy to provide command outputs as needed.
> > >
> > > I have included Hans de Goede in the CC list on this email since
> > he has
> > > been a great help getting to this point - this device has a few
> > strange
> > > quirks to work through but this is a fairly serious one.
> >
> > What kernel versions have you tried?
> >
> > Thanks,
> > Rafael
> >
> >
> >
[-- Attachment #2: cht_turbostat.txt --]
[-- Type: text/plain, Size: 3088 bytes --]
[testuser@otcpl-hp-cht-fedora turbostat]$ sudo turbostat --show Core,CPU,Avg_MHz,Busy%,Bzy_MHz,TSC_MHz
turbostat version 17.04.12 - Len Brown <lenb@kernel.org>
CPUID(0): GenuineIntel 11 CPUID levels; family:model:stepping 0x6:4c:3 (6:76:3)
CPUID(1): SSE3 MONITOR - EIST TM2 TSC MSR ACPI-TM TM
CPUID(6): APERF, TURBO, DTS, No-PTM, No-HWP, No-HWPnotify, No-HWPwindow, No-HWPepp, No-HWPpkg, EPB
cpu3: MSR_IA32_MISC_ENABLE: 0x00850089 (TCC EIST No-MWAIT PREFETCH TURBO)
CPUID(7): No-SGX
cpu3: MSR_PLATFORM_INFO: 0x60006001400
6 * 133.3 = 800.0 MHz max efficiency frequency
20 * 133.3 = 2666.6 MHz base frequency
cpu3: MSR_IA32_POWER_CTL: 0x00000000 (C1E auto-promotion: DISabled)
cpu3: MSR_TURBO_RATIO_LIMIT: 0x00000000
cpu3: MSR_PKG_CST_CONFIG_CONTROL: 0x0006000f (UNlocked: pkg-cstate-limit=15: unknown)
cpu3: cpufreq driver: intel_pstate
cpu3: cpufreq governor: powersave
cpufreq intel_pstate no_turbo: 0
cpu0: MSR_IA32_ENERGY_PERF_BIAS: 0x00000006 (balanced)
cpu0: MSR_IA32_TEMPERATURE_TARGET: 0x035a0000 (90 C)
Core CPU Avg_MHz Busy% Bzy_MHz TSC_MHz
- - 6 1.04 925 1600
0 0 8 1.47 913 1600
1 1 8 1.39 951 1600
2 2 2 0.34 856 1600
3 3 5 0.97 928 1600
Core CPU Avg_MHz Busy% Bzy_MHz TSC_MHz
- - 7 1.11 1109 1600
0 0 15 2.12 1217 1600
1 1 12 1.91 1055 1600
2 2 1 0.12 800 1600
3 3 1 0.30 800 1600
Core CPU Avg_MHz Busy% Bzy_MHz TSC_MHz
- - 3 0.53 964 1600
0 0 7 1.13 1006 1600
1 1 3 0.46 1049 1600
2 2 0 0.10 800 1600
3 3 2 0.43 800 1600
Core CPU Avg_MHz Busy% Bzy_MHz TSC_MHz
- - 6 1.06 964 1600
0 0 11 1.96 954 1600
1 1 9 1.38 1035 1600
2 2 1 0.27 884 1600
3 3 3 0.61 873 1600
Core CPU Avg_MHz Busy% Bzy_MHz TSC_MHz
- - 21 2.03 1717 1600
0 0 22 2.88 1295 1600
1 1 34 2.81 1995 1600
2 2 13 1.08 2025 1600
3 3 14 1.34 1798 1600
Core CPU Avg_MHz Busy% Bzy_MHz TSC_MHz
- - 88 8.16 1800 1600
0 0 75 9.64 1296 1600
1 1 76 7.86 1617 1600
2 2 100 7.53 2217 1600
3 3 101 7.61 2216 1600
Core CPU Avg_MHz Busy% Bzy_MHz TSC_MHz
- - 105 8.44 2068 1600
0 0 228 15.50 2451 1600
1 1 151 12.21 2067 1600
2 2 13 2.29 955 1600
3 3 26 3.74 1158 1600
Core CPU Avg_MHz Busy% Bzy_MHz TSC_MHz
- - 415 25.34 2730 1600
0 0 388 22.84 2832 1600
1 1 575 33.93 2823 1600
2 2 438 26.27 2781 1600
3 3 259 18.33 2359 1600
Core CPU Avg_MHz Busy% Bzy_MHz TSC_MHz
- - 38 4.38 1441 1600
0 0 69 7.07 1631 1600
1 1 41 4.58 1479 1600
2 2 36 4.85 1242 1600
3 3 5 1.01 896 1600
Core CPU Avg_MHz Busy% Bzy_MHz TSC_MHz
- - 14 1.21 1854 1600
0 0 8 1.12 1246 1600
1 1 14 1.16 2052 1600
2 2 20 1.52 2179 1600
3 3 12 1.07 1816 1600
Core CPU Avg_MHz Busy% Bzy_MHz TSC_MHz
- - 21 3.13 1116 1600
0 0 18 2.51 1221 1600
1 1 4 0.65 1105 1600
2 2 20 3.38 1007 1600
3 3 41 5.99 1134 1600
Core CPU Avg_MHz Busy% Bzy_MHz TSC_MHz
- - 232 17.48 2212 1600
0 0 245 18.85 2166 1600
1 1 163 13.29 2040 1600
2 2 270 19.51 2305 1600
3 3 250 18.26 2284 1600
Core CPU Avg_MHz Busy% Bzy_MHz TSC_MHz
- - 67 7.05 1582 1600
0 0 71 8.93 1333 1600
1 1 49 4.01 2024 1600
2 2 93 8.57 1807 1600
3 3 55 6.69 1364 1600
Core CPU Avg_MHz Busy% Bzy_MHz TSC_MHz
- - 24 3.70 1072 1600
0 0 33 5.72 960 1600
1 1 15 2.75 891 1600
2 2 24 3.46 1152 1600
3 3 24 2.87 1374 1600
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