From: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
To: Doug Smythies <dsmythies@telus.net>,
"'Rafael J. Wysocki'" <rjw@rjwysocki.net>
Cc: 'LKML' <linux-kernel@vger.kernel.org>,
'Len Brown' <len.brown@intel.com>,
'Peter Zijlstra' <peterz@infradead.org>,
'Giovanni Gherdovich' <ggherdovich@suse.cz>,
'Francisco Jerez' <francisco.jerez.plata@intel.com>,
'Linux PM' <linux-pm@vger.kernel.org>
Subject: Re: [RFC/RFT][PATCH] cpufreq: intel_pstate: Accept passive mode with HWP enabled
Date: Sun, 31 May 2020 11:59:30 -0700 [thread overview]
Message-ID: <4793937b5e2b8b03a1aa0943bb5f62d17496cfee.camel@linux.intel.com> (raw)
In-Reply-To: <000201d63776$2d56f330$8804d990$@net>
On Sun, 2020-05-31 at 11:06 -0700, Doug Smythies wrote:
> Hi Srinivas,
>
> Thanks you for your quick reply.
>
> On 2020.05.31 09:54 Srinivas Pandruvada wrote
> > On Sun, 2020-05-31 at 09:39 -0700, Doug Smythies wrote:
> > > Event begins at 17.456 seconds elapsed time.
> > > Previous event was about 107 milliseconds ago.
> > >
> > > Old min ; new min ; freq GHz; load % ; duration mS
> > > 27 ; 28 ; 4.60 ; 68.17 ; 10.226
> > > 28 ; 26 ; 4.53 ; 57.47 ; 10.005
> >
> > Seems you hit power/thermal limit
>
> No.
>
> I am nowhere near any power limit at all.
> I have meticulously configured and tested the thermal management of
> this computer.
> I never ever hit a thermal limit and have TDP set such that the
> processor
> temperature never exceeds about 75 degrees centigrade.
>
> There should never be throttling involved in these experiments.
> I can achieve throttling when compiling the kernel and with
> torture test mode on the mprime test (other CPU stressors,
> including my own, are not as good at generating heat as
> mprime).
>
> This system can run indefinitely at 99.9 watts processor package
> power.
> Example (turbostat, steady state, CPU freq throttled to 4.04 GHz):
>
> doug@s18:~$ sudo ~/turbostat --Summary --quiet --show
> Busy%,Bzy_MHz,PkgTmp,PkgWatt,GFXWatt,IRQ --interval 12
> Busy% Bzy_MHz IRQ PkgTmp PkgWatt GFXWatt
> 100.21 4045 72231 66 99.93 0.00
> 100.21 4043 72239 65 99.92 0.00
>
> > Is this some Lenovo system?
>
> No. The web page version of my original e-mail has
> a link to the test computer hardware profile.
>
> The motherboard is ASUS PRIME Z390-P.
>
OK, this seems a desktop system.
> > If you disable HWP you don't see that?
>
> Correct.
>
> > What is the value of
> > cat /sys/bus/pci/devices/0000\:00\:04.0/tcc_offset_degree_celsius
>
> ? "No such file or directory"
>
> > cat /sys/class/powercap/intel-rapl-mmio/intel-rapl-
> > mmio:0/constraint_0_power_limit_uw
>
You may not have
CONFIG_INT340X_THERMAL=y
What is
#rdmsr 0x1a2
Try changing energy_perf_bias and see if it helps here.
Thanks,
Srinivas
> ? "No such file or directory"
>
> > You may want to run
> > Try running dptfxtract once.
>
> No, I am not going to.
>
> I am not running thermald. Eventually I will, as a backup
> in case of cooling failure, so as not to hit the processor limit
> shutdown. I just haven't done it yet.
>
> > Then try to get again
> >
> > cat /sys/bus/pci/devices/0000\:00\:04.0/tcc_offset_degree_celsius
> > cat /sys/class/powercap/intel-rapl-mmio/intel-rapl-
> > mmio:0/constraint_0_power_limit_uw
> >
> >
> > Thanks,
> > Srinivas
>
>
next prev parent reply other threads:[~2020-05-31 18:59 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-26 18:20 [RFC/RFT][PATCH] cpufreq: intel_pstate: Accept passive mode with HWP enabled Rafael J. Wysocki
2020-05-31 16:39 ` Doug Smythies
2020-05-31 16:54 ` Srinivas Pandruvada
2020-05-31 18:06 ` Doug Smythies
2020-05-31 18:59 ` Srinivas Pandruvada [this message]
2020-05-31 19:28 ` Srinivas Pandruvada
2020-05-31 21:38 ` Doug Smythies
2020-06-30 19:10 ` cpufreq: intel_pstate: HWP mode issue Doug Smythies
2020-07-08 14:41 ` Doug Smythies
2020-07-08 14:54 ` srinivas pandruvada
2020-07-08 15:39 ` Doug Smythies
2020-08-02 14:36 ` Doug Smythies
2020-08-02 18:18 ` Srinivas Pandruvada
2020-12-17 16:58 ` Doug Smythies
2020-05-31 17:15 ` [RFC/RFT][PATCH] cpufreq: intel_pstate: Accept passive mode with HWP enabled Doug Smythies
2020-06-06 15:21 ` Doug Smythies
2020-06-06 15:21 ` Doug Smythies
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