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

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Date:	Thu, 31 Mar 2016 08:06:06 -0700
From:	Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
To:	Doug Smythies <dsmythies@...us.net>,
	'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>
Subject: Re: [intel-pstate driver regression] processor frequency very high
 even if in idle

On Thu, 2016-03-31 at 07:39 -0700, Doug Smythies wrote:
> On 2016.03.31 02:24 Jörg Otte wrote:

Hi Jörg,

Can you send me your kernel config file?

Thanks,
Srinivas
> 
> > jojo@...hte:/sys/devices/system/cpu/cpufreq/policy0$ cat
> > scaling_governor
> > powersave
> > 
> > turbostat -i 1 --msr=0x199
> > CPUID(7): No-SGX
> >     CPU Avg_MHz   Busy% Bzy_MHz TSC_MHz   MSR 0x199
> >       -      45    1.74    2590    2496  0x00000000
> >       0      45    1.76    2565    2498  0x00000a00
> >       1      72    2.84    2548    2496  0x00000800
> >       2      30    1.11    2661    2496  0x00001a00
> >       3      33    1.23    2661    2495  0x00001a00
> >     CPU Avg_MHz   Busy% Bzy_MHz TSC_MHz   MSR 0x199
> >       -       9    0.35    2525    2495  0x00000000
> >       0       1    0.04    2735    2495  0x00000800
> >       1       1    0.05    2501    2495  0x00000800
> >       2      17    0.65    2540    2495  0x00001a00
> >       3      16    0.64    2501    2495  0x00001a00
> >     CPU Avg_MHz   Busy% Bzy_MHz TSC_MHz   MSR 0x199
> >       -      11    0.43    2523    2495  0x00000000
> >       0       3    0.11    2631    2495  0x00000c00
> >       1       7    0.27    2524    2495  0x00000800
> >       2      18    0.72    2527    2495  0x00001a00
> >       3      15    0.61    2501    2495  0x00001a00
> 
> 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.
> 
> ... Doug
> 
> 
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