linux-kernel - RE: [intel-pstate driver regression] processor frequency very high even if in idle

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Message-ID: <003001d18b5f$748d3420$5da79c60$@net>
Date:	Thu, 31 Mar 2016 08:10:25 -0700
From:	"Doug Smythies" <dsmythies@...us.net>
To:	'Jörg Otte' <jrg.otte@...il.com>
Cc:	"'Rafael J. Wysocki'" <rafael@...nel.org>,
	"'Linux Kernel Mailing List'" <linux-kernel@...r.kernel.org>,
	<linux-pm@...r.kernel.org>,
	"'Rafael J. Wysocki'" <rjw@...ysocki.net>,
	"'Srinivas Pandruvada'" <srinivas.pandruvada@...ux.intel.com>
Subject: RE: [intel-pstate driver regression] processor frequency very high even if in idle

On 2016.03.31 07:40 Doug Smythies wrote:
> On 2016.03.31 02:24 Jörg Otte wrote:

>>
>> jojo@...hte:/sys/devices/system/cpu/cpufreq/policy0$ cat scaling_governor
>> powersave
>> 
>> turbostat -i 1 --msr=0x199
>> CPUID(7): No-SGX

... [cut]...

> Very Interesting.
>
> I would still like to get a trace sample to post process.
> Copied from a previous e-mail:
>
> On an otherwise idle system, do:
>
> # perf record -a --event=power:pstate_sample sleep 300
>
> If pressed for time, your sleep time can be less than 5 minutes,
> but try to get at least 100 seconds.
>
> The resulting perf.data file will be too big to include as an
> on-list attachment, but send it (or them) to me off-list for
> post processing, and I'll report back.

Never mind. I had not seen some of the e-mails, in particular
the one where Rafael had figured out the issue.

... Doug