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From: Andy Tang <andy.tang@nxp.com>
To: Viresh Kumar <viresh.kumar@linaro.org>
Cc: "rjw@rjwysocki.net" <rjw@rjwysocki.net>,
	"linux-pm@vger.kernel.org" <linux-pm@vger.kernel.org>
Subject: RE: [EXT] Re: Ask for help about cpufreq issue
Date: Fri, 7 Feb 2020 06:03:12 +0000	[thread overview]
Message-ID: <VI1PR04MB43334D5868037FCAE4D7631BF31C0@VI1PR04MB4333.eurprd04.prod.outlook.com> (raw)
In-Reply-To: <20200207052321.povhuxrlm25ueoak@vireshk-i7>

Hi Viresh,

I have tried performance governor, cpu frequency is at the lowest frequency.
I also tried ondemand governor with high cpu load, cpu frequency doesn't increase too.

root@localhost:~# cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
performance
root@localhost:~# cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies
1600000 1000000 800000 500000
root@localhost:~#
root@localhost:~# cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq
500000

root@localhost:~# cat /sys/devices/system/cpu/cpufreq/policy0/stats/*
cat: /sys/devices/system/cpu/cpufreq/policy0/stats/reset: Permission denied
1600000 214
1000000 91
800000 82
500000 480088
240
   From  :    To
         :   1600000   1000000    800000    500000
  1600000:         0        15        10        10
  1000000:        21         0        22        18
   800000:         6        23         0        44
   500000:         7        23        41         0
BR,
Andy

> -----Original Message-----
> From: Viresh Kumar <viresh.kumar@linaro.org>
> Sent: 2020年2月7日 13:23
> To: Andy Tang <andy.tang@nxp.com>
> Cc: rjw@rjwysocki.net; linux-pm@vger.kernel.org
> Subject: [EXT] Re: Ask for help about cpufreq issue
> 
> Caution: EXT Email
> 
> On 07-02-20, 05:09, Andy Tang wrote:
> > Hi Viresh,
> >
> > Cpufreq failed to work on our board. CPU frequency keeps at the lowest
> frequency whatever governor I choose.
> 
> Have you tried performance governor ? Freq should move to highest freq
> there for sure.
> 
> How do you check the frequency ? Without significant load you won't see the
> freq movement.
> 
> Also have a look at the policy0/stats/ directory. It will show the details of freq
> switching properly, include the transitions that have happened.
> 
> > Hardware platform: ls1043ardb board (4 cores arm64 arch)
> > Software: linux kernel v5.4.3 + ubuntu 1804.
> >
> > Test log:
> > root@localhost:~# echo performance >
> > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
> > root@localhost:~# cat
> > /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq
> > 500000
> > root@localhost:~# cat
> > /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies
> > 1600000 1000000 800000 500000
> >
> > All the parameters you may need:
> > root@localhost:~# for entry in `ls
> > /sys/devices/system/cpu/cpufreq/policy0/` ; do echo $entry;  cat
> > /sys/devices/system/cpu/cpufreq/policy0/$entry; done affected_cpus
> > 0 1 2 3
> > cpuinfo_cur_freq
> > 500000
> > cpuinfo_max_freq
> > 1600000
> > cpuinfo_min_freq
> > 500000
> > cpuinfo_transition_latency
> > 31
> > related_cpus
> > 0 1 2 3
> > scaling_available_frequencies
> > 1600000 1000000 800000 500000
> > scaling_available_governors
> > userspace ondemand performance schedutil scaling_cur_freq
> > 500000
> > scaling_driver
> > qoriq_cpufreq
> > scaling_governor
> > performance
> > scaling_max_freq
> > 500000
> > scaling_min_freq
> > 500000
> > scaling_setspeed
> > <unsupported>
> > stats
> > cat: /sys/devices/system/cpu/cpufreq/policy0/stats: Is a directory
> >
> >
> > Could you please instruct me how to investigate this issue?
> >
> > BR,
> > Andy
> 
> --
> viresh

  reply	other threads:[~2020-02-07  6:03 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-07  5:09 Ask for help about cpufreq issue Andy Tang
2020-02-07  5:23 ` Viresh Kumar
2020-02-07  6:03   ` Andy Tang [this message]
2020-02-07  7:05     ` [EXT] " Viresh Kumar
2020-02-11  4:20       ` Andy Tang
2020-02-11  5:53         ` Viresh Kumar
2020-02-11  6:23           ` Andy Tang
2020-02-11  6:34             ` Viresh Kumar
2020-02-11  7:20               ` Andy Tang
2020-02-12 10:11               ` Andy Tang
2020-02-12 11:50                 ` Viresh Kumar
2020-02-13  8:18                   ` Andy Tang
2020-02-13  8:48                     ` Viresh Kumar
2020-02-13  9:12                       ` Andy Tang
2020-02-13  9:15                         ` Viresh Kumar
2020-02-13  9:21                           ` Andy Tang
2020-02-14 10:00                       ` Andy Tang
2020-02-17  8:22                         ` Viresh Kumar

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