The Intel 12th Gen Core i9-12900K Review: Hybrid Performance Brings Hybrid Complexity
by Dr. Ian Cutress & Andrei Frumusanu on November 4, 2021 9:00 AM ESTCPU Performance: Windows 11 vs Windows 10
There are going to be a lot of Windows 11 vs Windows 10 testing over the next few months, based on different CPUs, chipsets, configurations, and even situations where CPUs are replaced and drivers need to be reinstalled to get full performance. Windows 11 is still young, and most of our tests worked (WSL did not, will need to find out why). In this instance both OS installs were fresh and default with all updates and updated drivers. We haven't had time to run our gaming tests, those should come soon.
Windows 11 has a small effect on some of our Multi-Threaded tests, such as y-cruncher, Speedometer, and AES, but for the most part it's quite minimal.
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mode_13h - Monday, November 15, 2021 - link
Do you know, for a fact, that the new scheduling policies override the priority-boost you mentioned? I wouldn't assume so, but I'm not saying they don't.Maybe I'm optimistic, but I think MS is smart enough to know there are realtime services that don't necessarily have focus and wouldn't break that usage model.
ZioTom - Monday, November 29, 2021 - link
Windows 11 scheduler fails to allocate workloads...I noticed that the scheduler parks the cores if the application isn't full screen.
I did a test on a 12700k with Handbrake: as long as the program window remains in the foreground, all the Pcore and Ecore are allocated at 100%. If I open a browser and use it while the movie is being compressed, the kernel takes the load off the Pcore and runs the video compression only on the Ecores. Absurd behavior, absolutely useless!
alpha754293 - Wednesday, January 12, 2022 - link
I have my 12900K for a little less than a month now and here's what I've found from the testing that I've done with the CPU:(Hardware notes/specs: Asus Z690 Prime-P D4 motherboard, 4x Crucial 32 GB DDR4-3200 unbuffered, non-ECC RAM (128 GB total), running CentOS 7.7.1908 with the 5.14.15 kernel)
IF your workload CAN be multithreaded and it can run on BOTH the P cores AND the E cores simultaneously, then there is a potential that you can have better performance than the 5950X. BUT if you CAN'T run your application on both the P cores and the E cores at the same time (which a number of distributed parallel applications that rely on MPI), then you WON'T be able to realise the performance advantages that having both said P cores and E cores would give you (based on what the benchmark results show).
And if your program, further, cannot use HyperThreading (which some HPC/CAE program will actually lock you out of doing so), then you can be upwards of anywhere between 63-81% SLOWER than the 5950X (because on the 5950X, even with SMT disabled, you can still run the programme on all 16 physical cores, vs. the 8 P cores on the 12900K).
Please take note.
alceryes - Wednesday, August 24, 2022 - link
Question.Did you use 'affinities' for all the different core tests (P-core only, P+E-core tests)?