From: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
To: Viresh Kumar <viresh.kumar@linaro.org>, Arto Jantunen <viiru@iki.fi>
Cc: "Chen, Yu C" <yu.c.chen@intel.com>,
Doug Smythies <dsmythies@telus.net>,
"'Rafael J. Wysocki'" <rjw@rjwysocki.net>,
"linux-pm@vger.kernel.org" <linux-pm@vger.kernel.org>
Subject: Re: PROBLEM: Cpufreq constantly keeps frequency at maximum on 4.5-rc4
Date: Mon, 22 Feb 2016 11:25:02 -0800 [thread overview]
Message-ID: <56CB608E.5080107@linux.intel.com> (raw)
In-Reply-To: <20160222164822.GV28226@vireshk-i7>
On 02/22/2016 08:48 AM, Viresh Kumar wrote:
> On 22-02-16, 22:11, Viresh Kumar wrote:
>>> Thanks. I tried this, and somewhat surprisingly it doesn't change the
>>> result. I guess we are back to doing a full bisect?
>> Good. That was kind of what I expected, so no surprise :)
>>
>> I think bisect wouldn't be that difficult, please try :)
> Okay, for record, I looked at all the patches that went into 4.5-rcs
> into drivers/cpufreq/ directory and there is absolutely nothing in
> there, that could have caused this. I suspect some x86 core changes
> have broken this stuff.
Correct. There is no change submitted in this release cycle to impact to
cpufreq drivers.
Arto,
I want to understand your issue. I just gave a try by setting default
governors to ondemand and performance and changing them on fly.
I didn't see any issue. So try the steps below. It doesn't work for you
then I have some dumps to send at the end.
Verify that you are using HWP
[linux]$ dmesg | grep -i HWP
[ 2.136799] intel_pstate: HWP enabled
1. Test with default governor as powersave
Default governor is on_damand, which will be "powersave" for
Intel_Pstate driver. In kernel config
CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND=y
[linux ~]$ uname -a
Linux spandruv-mobl.jf.intel.com 4.5.0-rc2+ #13 SMP Fri Feb 19 13:58:16
PST 2016 x86_64 x86_64 x86_64 GNU/Linux
[linux ~]$ sudo cpupower frequency-info
analyzing CPU 0:
driver: intel_pstate
CPUs which run at the same hardware frequency: 0
CPUs which need to have their frequency coordinated by software: 0
maximum transition latency: 0.97 ms.
hardware limits: 400 MHz - 3.10 GHz
available cpufreq governors: performance, powersave
current policy: frequency should be within 400 MHz and 3.10 GHz.
The governor "powersave" may decide which speed to use
within this range.
current CPU frequency is 503 MHz (asserted by call to hardware).
boost state support:
Supported: yes
Active: yes
[linux ~]$ sudo turbostat -i 1
CPU Avg_MHz %Busy Bzy_MHz TSC_MHz
- 36 4.59 776 1512
0 42 5.10 817 1511
2 22 2.91 766 1512
1 44 5.74 770 1512
3 34 4.61 746 1512
CPU Avg_MHz %Busy Bzy_MHz TSC_MHz
- 17 3.06 551 1512
0 32 5.97 543 1512
2 7 1.26 546 1512
1 17 2.94 570 1512
3 11 2.06 550 1512
CPU Avg_MHz %Busy Bzy_MHz TSC_MHz
- 24 4.45 541 1512
0 21 3.81 557 1512
2 25 4.76 525 1512
1 35 6.35 552 1512
3 15 2.90 525 1512
CPU Avg_MHz %Busy Bzy_MHz TSC_MHz
- 17 3.25 524 1512
0 20 3.71 530 1512
2 14 2.78 510 1512
1 8 1.56 516 1512
3 26 4.97 529 1512
Now change the default policy to performance
[linux]$ sudo cpupower frequency-set -g performance
Setting cpu: 0
Setting cpu: 1
Setting cpu: 2
Setting cpu: 3
[linux ~]$ sudo turbostat -i 1
CPU Avg_MHz %Busy Bzy_MHz TSC_MHz
- 33 1.14 2925 1512
0 19 0.66 2879 1512
2 83 2.79 2993 1512
1 13 0.48 2662 1512
3 18 0.63 2879 1512
CPU Avg_MHz %Busy Bzy_MHz TSC_MHz
- 34 1.17 2942 1512
0 19 0.64 2914 1512
2 83 2.77 2996 1512
1 24 0.84 2812 1512
3 12 0.42 2888 1512
CPU Avg_MHz %Busy Bzy_MHz TSC_MHz
- 64 2.30 2779 1512
0 93 3.36 2768 1512
2 49 1.73 2850 1512
1 29 1.16 2497 1512
3 85 2.96 2860 1512
CPU Avg_MHz %Busy Bzy_MHz TSC_MHz
- 31 1.08 2828 1512
0 15 0.57 2582 1512
2 18 0.67 2645 1512
1 31 1.12 2792 1512
3 59 1.97 2982 1512
As expected busy MHz changed to possible max.
[linux]$ sudo cpupower frequency-set -g powersave
Setting cpu: 0
Setting cpu: 1
Setting cpu: 2
Setting cpu: 3
[linux ~]$ sudo turbostat -i 1
CPU Avg_MHz %Busy Bzy_MHz TSC_MHz
- 22 3.31 672 1512
0 19 2.40 809 1511
2 19 2.18 863 1512
1 41 7.10 584 1512
3 9 1.57 596 1512
CPU Avg_MHz %Busy Bzy_MHz TSC_MHz
- 57 7.59 749 1512
0 59 6.78 876 1512
2 54 6.96 770 1512
1 71 10.18 700 1512
3 43 6.43 672 1512
CPU Avg_MHz %Busy Bzy_MHz TSC_MHz
- 78 10.50 739 1512
0 115 14.19 811 1512
2 86 11.08 774 1512
1 53 6.98 758 1512
3 CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE=y 57 9.75
582 1512
CPU Avg_MHz %Busy Bzy_MHz TSC_MHz
- 51 7.14 720 1512
0 35 4.95 710 1512
2 47 5.88 798 1512
1 78 9.32 832 1512
3 46 8.40 546 1512
Busy MHz is no longer max possible.
2.
Now set the default governor in kernel config as "performance" and rebuild.
CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE=y
[linux ~]$ sudo turbostat -i 1
CPU Avg_MHz %Busy Bzy_MHz TSC_MHz
- 323 12.00 2689 1512
0 293 11.25 2607 1512
2 220 8.58 2571 1512
1 176 6.87 2565 1512
3 601 21.30 2821 1512
CPU Avg_MHz %Busy Bzy_MHz TSC_MHz
- 37 1.26 2913 1512
0 74 2.47 2988 1512
2 35 1.18 2920 1512
1 21 0.79 2683 1512
3 18 0.61 2891 1512
CPU Avg_MHz %Busy Bzy_MHz TSC_MHz
- 30 1.04 2879 1512
0 64 2.17 2970 1512
2 16 0.56 2901 1512
1 15 0.57 2620 1512
3 25 0.88 2810 1512
CPU Avg_MHz %Busy Bzy_MHz TSC_MHz
- 48 1.65 2887 1512
0 36 1.29 2814 1512
2 77 2.59 2957 1512
1 23 0.87 2661 1512
3 55 1.85 2943 1512
No change to powersave
[linux ~]$ sudo cpupower frequency-set -g powersave
Setting cpu: 0
Setting cpu: 1
Setting cpu: 2
Setting cpu: 3
[linux ~]$ sudo turbostat -i 1
CPU Avg_MHz %Busy Bzy_MHz TSC_MHz
- 18 3.22 565 1512
0 16 2.51 647 1511
2 8 1.45 551 1512
1 33 5.94 551 1512
3 16 2.98 532 1512
CPU Avg_MHz %Busy Bzy_MHz TSC_MHz
- 20 3.57 548 1512
0 14 2.06 685 1512
2 13 2.38 527 1512
1 16 2.85 559 1512
3 36 6.99 511 1512
CPU Avg_MHz %Busy Bzy_MHz TSC_MHz
- 20 3.62 542 1512
0 17 2.87 597 1512
2 13 2.18 585 1512
1 36 7.02 509 1512
3 13 2.41 536 1512
Change back to performance
[linux ~]$ sudo cpupower frequency-set -g performance
Setting cpu: 0
Setting cpu: 1
Setting cpu: 2
Setting cpu: 3
[linux ~]$ sudo turbostat -i 1
CPU Avg_MHz %Busy Bzy_MHz TSC_MHz
- 33 1.14 2898 1512
0 78 2.61 2998 1513
2 24 0.86 2815 1512
1 16 0.61 2618 1512
3 14 0.49 2867 1512
CPU Avg_MHz %Busy Bzy_MHz TSC_MHz
- 33 1.11 2938 1512
0 79 2.62 3019 1512
2 19 0.68 2832 1512
1 21 0.77 2740 1512
3 11 0.38 2973 1512
CPU Avg_MHz %Busy Bzy_MHz TSC_MHz
- 35 1.23 2888 1512
0 23 0.84 2722 1512
2 21 0.72 2898 1512
1 82 2.78 2938 1512
3 16 0.56 2870 1512
CPU Avg_MHz %Busy Bzy_MHz TSC_MHz
- 63 2.24 2820 1512
0 67 2.38 2800 1512
2 73 2.56 2864 1512
1 87 3.07 2842 1512
3 25 0.93 2676 1512
Now if you don't get above results, then send the following for each
mode "powersave" and "performance".
rdmsr 0xCE
rdmsr 0x1AD
rdmsr 0x770
rdmsr 0x771
rdmsr 0x772
rdmsr 0x773
rdmsr 0x774
rdmsr 0x777
Thanks,
Srinivas
next prev parent reply other threads:[~2016-02-22 19:25 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-20 8:49 PROBLEM: Cpufreq constantly keeps frequency at maximum on 4.5-rc4 Arto Jantunen
2016-02-20 16:31 ` Doug Smythies
2016-02-20 17:10 ` Arto Jantunen
2016-02-20 18:03 ` Chen, Yu C
2016-02-21 8:45 ` Arto Jantunen
2016-02-21 8:52 ` Chen, Yu C
2016-02-21 20:02 ` Srinivas Pandruvada
2016-02-21 20:33 ` Arto Jantunen
2016-02-22 6:16 ` Viresh Kumar
2016-02-22 16:39 ` Arto Jantunen
2016-02-22 16:41 ` Viresh Kumar
2016-02-22 16:48 ` Viresh Kumar
2016-02-22 19:25 ` Srinivas Pandruvada [this message]
2016-02-28 15:43 ` Arto Jantunen
2016-02-29 6:22 ` Doug Smythies
2016-03-01 19:28 ` Doug Smythies
2016-02-29 16:49 ` Srinivas Pandruvada
2016-03-01 0:37 ` Rafael J. Wysocki
[not found] ` <20160229201946.0bdcc48e@annuminas.surriel.com>
2016-03-01 7:06 ` Arto Jantunen
2016-03-01 16:59 ` Arto Jantunen
2016-03-01 19:22 ` Rik van Riel
2016-03-01 19:47 ` Arto Jantunen
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