Messages in this thread | | | Date | Tue, 24 Nov 2015 03:38:54 -0800 | From | Jacob Pan <> | Subject | Re: [PATCH 3/4] sched: introduce synchronized idle injection |
| |
On Fri, 20 Nov 2015 11:58:12 +0100 (CET) Thomas Gleixner <tglx@linutronix.de> wrote:
> if (machine_on_fire) { Just to add data to show this is not just for emergency. I have an broadwell laptop, here is the test I did. - clamp cpu freq to 900MHz (close to max efficiency) - run gpu and cpu load (cut-the-rop, glxgears) - turn fans off
run tmon (tools/thermal/tmon) to show temperatures and thermal trip points. (sorry about the long lines, quite a few thermal sensors) Also run turbostat to show CPU idle etc.
Observations: without idle injection: ------------------------------------------------------------------ - package temp rise to 66C crossing the second active trip points (2nd fan speed should kick in if not disabled) - package power 9.47w - cpu c0 ~90%, 0% core c7 ------------------------------------------------------------------ - with idle injection 20% - cpu c0 ~67%, ~13% core c7, ~7% package c-states - package power 4.53w - package temp 52C
glxgears maintains the same frame rate. didnt measure cut-the-rope but still plays.
This is a large 14 inch laptop with much better cooling than a fanless tablet/convertible. So hitting thermal constraints can happen in _NORMAL_ condition (even at 900MHz), not just on fire case.
Sync up idle can save energy efficiency and i think scheduler is a better place to solve that problem, perhaps with PM QoS constraint will have less perceived intrusive behavior.
Thanks,
Jacob
│Trip Points: AAAAC C AAPHCPP APHCPP PHCPP AAPHCPP AAAAPHCPP APHCPP AAAAPHC PP │ └─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘ ┌──────────────────────────────────────────────────────────────────────────────────────────────────────────── COOLING DEVICES ────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐ │ID Cooling Dev Cur Max Thermal Zone Binding │ │00 TFN1 4 11 │││││││││││ │││││││││││ │││││││││││ │││││││││││ │││││││││││ │││││││││││ │││││││││││ │││││││││││ │││││││││││ │││││││││││ ││││││││││││ │ │01 Fan 0 1 │││*│││││││ │││││││││││ │││││││││││ │││││││││││ │││││││││││ │││││││││││ │││││││││││ │││││││││││ │││││││││││ │││││││││││ ││││││││││││ │ │02 Fan 0 1 ││*││││││││ │││││││││││ │││││││││││ │││││││││││ │││││││││││ │││││││││││ │││││││││││ │││││││││││ │││││││││││ │││││││││││ ││││││││││││ │ │03 Fan 0 1 │*│││││││││ │││││││││││ │││││││││││ │││││││││││ │││││││││││ │││││││││││ │││││││││││ │││││││││││ │││││││││││ │││││││││││ ││││││││││││ │ │04 Fan 0 1 *││││││││││ │││││││││││ │││││││││││ │││││││││││ │││││││││││ │││││││││││ │││││││││││ │││││││││││ │││││││││││ │││││││││││ ││││││││││││ │ │05 CHRG 4 4 │││││││││││ │││││││││││ │││││││││││ │││││││││││ │││││││││││ │││││││││││ │││││││││││ │││││││││││ │││││││││││ │││││││││││ ││││││││││││ │ │06 intel_powerc -1 50 │││││││││││ │││││││││││ │││││││││││ │││││││││││ │││││││││││ │││││││││││ │││││││││││ │││││││││││ │││││││││││ │││││││││││ ││││││││││││ │ └─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘ ┌─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┐ │ 10 20 30 40 50 60 70 80 90 100 110 120 │ │acpitz 0:[ 66][→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→A55→→→→→→→A65 A75 A85 C111 ] │ │pch_wi 1:[ 59][→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→ C115 ] │ │INT340 2:[ 20][→→→→→→→→→→→→→→→→→→→→→ ] │ │ SEN1 3:[ 47][P0→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→ A58 A63 P71 H100103 ] │ │ SEN2 4:[ 51][P0→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→ A63 P71 H100103 ] │ │ SEN3 5:[ 46][P0→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→ P71 H100103 ] │ │ SEN4 6:[ 45][P0→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→ A58 A63 P71 H100103 ] │ │ SEN6 7:[ 46][P0→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→ A48 A53 A58 A63 P71 H100103 ] │ │ SEN7 8:[ 27][P0→→→→→→→→→→→→→→→→→→→→→→→→→→ A63 P71 H100103 ] │ │ B0D4 9:[ 66][→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→A55→→→→→→→A65 A75 A85 P102045 ] │ │x86_pk10:[ 66][P0→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→→ ] │ └─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘ turbostat without idle injection 1 3 776 86.37 898 2295 0 11.90 Core CPU Avg_MHz %Busy Bzy_MHz TSC_MHz SMI CPU%c1 CPU%c3 CPU%c6 CPU%c7 CoreTmp PkgTmp Pkg%pc2 Pkg%pc3 Pkg%pc6 Pkg%pc7 Pkg%pc8 Pkg%pc9 Pk%pc10 PkgWatt CorWatt GFXWatt - - 801 89.16 898 2295 0 9.77 0.55 0.07 0.44 66 70 0.00 0.00 0.00 0.00 0.00 0.00 0.00 9.47 4.31 1.17 0 0 801 89.26 898 2294 0 9.76 0.57 0.07 0.34 64 70 0.00 0.00 0.00 0.00 0.00 0.00 0.00 9.47 4.31 1.17 0 2 803 89.43 898 2294 0 9.58 1 1 810 90.27 898 2295 0 8.59 0.52 0.07 0.55 66 1 3 787 87.69 898 2295 0 11.17
turbostat with 20% idle injection Core CPU Avg_MHz %Busy Bzy_MHz TSC_MHz SMI CPU%c1 CPU%c3 CPU%c6 CPU%c7 CoreTmp PkgTmp Pkg%pc2 Pkg%pc3 Pkg%pc6 Pkg%pc7 Pkg%pc8 Pkg%pc9 Pk%pc10 PkgWatt CorWatt GFXWatt - - 601 66.92 898 2295 0 13.48 4.65 1.09 13.86 52 52 3.50 0.60 0.46 2.30 0.00 0.00 0.00 4.53 1.99 0.17 0 0 605 67.36 898 2294 0 12.75 5.95 1.51 12.42 51 52 3.50 0.60 0.46 2.30 0.00 0.00 0.00 4.53 1.99 0.17 0 2 583 64.94 898 2295 0 15.18 1 1 605 67.37 898 2295 0 13.31 3.34 0.67 15.30 52 1 3 611 68.02 898 2295 0 12.66
~ ~ ~
> defer_timer_interrupt(5ms); > end = now + 5ms: > while (now < end) > mwait(); > }
[Jacob Pan]
| |