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SubjectRe: [RFC/RFT][PATCH] cpufreq: intel_pstate: Accept passive mode with HWP enabled
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On Sun, 2020-05-31 at 11:59 -0700, Srinivas Pandruvada wrote:
> 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.
>
Also if
MSR 0x1FC bit 19 is 0, change to 1.

Thanks,
Srinivas

> 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

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