From: Viresh Kumar <viresh.kumar@linaro.org>
To: Andy Tang <andy.tang@nxp.com>
Cc: "rjw@rjwysocki.net" <rjw@rjwysocki.net>,
"linux-pm@vger.kernel.org" <linux-pm@vger.kernel.org>
Subject: Re: Ask for help on governor
Date: Tue, 12 Dec 2017 13:00:58 +0530 [thread overview]
Message-ID: <20171212073058.GM25177@vireshk-i7> (raw)
In-Reply-To: <HE1PR0402MB282866171A847AE244A9F76CF3340@HE1PR0402MB2828.eurprd04.prod.outlook.com>
On 12-12-17, 02:46, Andy Tang wrote:
> Hi,
>
> I run into a question that conservative governor can't work while ondemand governor works well.
> When cpu load gets higher, if ondemand governor is used, cpu frequency can get higher and higher.
> But if I use conservative governor, cpu frequency stays on lowest frequency no matter what cpu load is.
>
> This issue was found on kernel 4.14.0, on kernel 4.9 kernel. It acts well.
You mean to say that the problem exists on 4.14 but not on 4.9?
Strange, as we haven't seen any such reports from anyone else.
> I think it may related to cpufreq framework, not driver itself. Could you guys give me some clues on how to debug it?
> I don't expect a direct answer; any suggestions are welcome.
Please provide output of below:
grep . /sys/devices/system/cpu/cpufreq/policy*/*
And then you may need to bisect the problem as well by going to kernel version
in between 4.9 and 4.14.
--
viresh
next parent reply other threads:[~2017-12-12 7:31 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <HE1PR0402MB282866171A847AE244A9F76CF3340@HE1PR0402MB2828.eurprd04.prod.outlook.com>
2017-12-12 7:30 ` Viresh Kumar [this message]
2017-12-12 16:18 ` Ask for help on governor Doug Smythies
2017-12-12 16:51 ` Rafael J. Wysocki
2017-12-13 3:10 ` Doug Smythies
2017-12-13 6:17 ` Viresh Kumar
2017-12-13 6:22 ` Andy Tang
2017-12-13 6:55 ` Viresh Kumar
2017-12-13 16:13 ` Doug Smythies
2017-12-14 1:21 ` Doug Smythies
2017-12-14 2:42 ` Andy Tang
2017-12-14 18:25 ` Stratos Karafotis
2017-12-15 1:29 ` Doug Smythies
2017-12-15 1:30 ` Doug Smythies
2017-12-15 1:56 ` Andy Tang
2017-12-15 7:37 ` Doug Smythies
2017-12-15 9:00 ` Andy Tang
2017-12-15 14:26 ` Rafael J. Wysocki
2017-12-15 15:53 ` Rafael J. Wysocki
2017-12-15 18:27 ` Doug Smythies
2017-12-15 23:53 ` Rafael J. Wysocki
2017-12-18 1:15 ` [PATCH] cpufreq: governor: Ensure sufficiently large sampling intervals Rafael J. Wysocki
2017-12-18 2:59 ` Andy Tang
2017-12-18 4:38 ` Viresh Kumar
2017-12-18 16:11 ` Doug Smythies
2017-12-18 17:42 ` Rafael J. Wysocki
2017-12-13 16:13 ` Ask for help on governor Doug Smythies
2017-12-13 16:49 ` Doug Smythies
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