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
next prev parent 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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