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3DMark Draw Calls, Single Threaded Faster

Discussion in 'Videocards - NVIDIA GeForce Drivers Section' started by wrathloki, Jul 24, 2015.

  1. wrathloki

    wrathloki Maha Guru

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    I just did an API draw calls test in 3DMark and noticed that single-threaded DX11 was just slightly faster than multi-threaded.
    [​IMG]
    What's up with this?
     
  2. Darren Hodgson

    Darren Hodgson Ancient Guru

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    Is that result repeatable? Do you have MFAA set to on in the global NVIDIA because I noticed that it cause some weird results similar to yours on my system when it is, including DXDiag not detecting DX12 but DX11.3 and the DX12 3DMark API Overhead test not running.

    Turn MFAA off and the results are what you'd expect with a higher multi-threaded score and DX12 is detected and working.
     
  3. wrathloki

    wrathloki Maha Guru

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    It is repeatable and MFAA on or off makes no difference. Could this have something to do with having my CPU cores unparked?
     
  4. Darren Hodgson

    Darren Hodgson Ancient Guru

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  5. wrathloki

    wrathloki Maha Guru

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    I'm not running Windows 10 so can't check DX12 performance. Wouldn't DX12 naturally be better in any case? What are your MFAA on and off results with just DX11?

    One thing, I did notice that with MFAA off when actually in the program I got a significantly higher draw calls per frame on multi-threaded despite the end result being the same. Also the MT thread test has 2 parts with MFAA off as opposed to 1 with MFAA on.

    Edit: disregard my first paragraph, I should have actually clicked your results.
     
    Last edited: Jul 24, 2015
  6. Darren Hodgson

    Darren Hodgson Ancient Guru

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    Ah, OK, sorry I assumed you were using Windows 10 due it being primarily a test to show off DX12.

    However, it is interesting that MFAA on causes lower multi-threaded results in this test on both Windows 8.1 and Windows 10. That is something that NVIDIA need to address because MFAA is a setting intended to be left on globally by design and doing so clearly affects the results of that API test.
     
  7. tsunami231

    tsunami231 Ancient Guru

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    um isn MFAA a form of aa? why would that be ment to be on globally?

    or is MFAA more of addon option ment to be used when MSAA is used?
     
  8. Darren Hodgson

    Darren Hodgson Ancient Guru

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    MFAA is automatically used in any game that uses MSAA so it is best enabled globally as far as I have been able to discern since it does not affect any game that does not use MSAA (which is the majority of games these days, sadly).

    Of course, you can disable MFAA on a per-game basis if you prefer not to have MFAA in that title but since it effectively doubles the amount of anti-aliasing for little or no cost, e.g. 2xMSAA + MFAA = 4xMSAA, then there is nothing to lose by leaving it set globally IMO. Except for skewered 3DMark and DXDiag results... ;)
     
    Last edited: Jul 24, 2015
  9. tsunami231

    tsunami231 Ancient Guru

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    yah MSAA isnt exactly compatible with most engines thes days. guess it dont mater as MFAA dont work on kepler so it kind disabled on my end anyway, but if MFAA is messing with single thread performance vs off that would be bad bug imo
     
    Last edited: Jul 24, 2015
  10. wrathloki

    wrathloki Maha Guru

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    In any case that doesn't seem to be affecting me. The way it looks on my test results is that single thread is way higher than it should be and multi thread is right where it should be. Could this be due to unparking my CPU cores or some other weirdness?
     

  11. tsunami231

    tsunami231 Ancient Guru

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    unparked cores would be max performance for both test, parked cores would reduce performance on both test, cant see how that would be the issue though
     
  12. -Tj-

    -Tj- Ancient Guru

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    Yes it was always like so, well at least in Win8.1


    btw 350.xx to 353.06 had another jump too, each driver branch actually adds a few extra calls, 305.06 was the fastest so far.


    350.05
    http://www.3dmark.com/aot/23143
    DX11 Multi-threaded draw calls per second
    2 428 128
    DX11 Single-threaded draw calls per second
    2 324 301


    352.86
    http://www.3dmark.com/aot/26031
    DX11 Multi-threaded draw calls per second
    2 457 365
    DX11 Single-threaded draw calls per second
    2 510 688


    353.06
    http://www.3dmark.com/aot/29824
    DX11 Multi-threaded draw calls per second
    2 463 436
    DX11 Single-threaded draw calls per second
    2 557 310




    353.38
    http://www.3dmark.com/aot/38140
    DX11 Multi-threaded draw calls per second
    2 426 594
    DX11 Single-threaded draw calls per second
    2 499 234


    353.49 , although now im using 4.6ghz & 2133
    http://www.3dmark.com/3dm/7870893?
    DX11 Multi-threaded draw calls per second
    2 346 244
    DX11 Single-threaded draw calls per second
    2 478 748

    EDIT:

    Ok 4.7Ghz & 2400, made that difference

    353.49
    http://www.3dmark.com/3dm/7871215?
    DX11 Multi-threaded draw calls per second
    2 431 530
    DX11 Single-threaded draw calls per second
    2 549 102

    looks like they're the closest to 353.06 perf. at least single threaded part, which imo still matters the most.
    Its because of that main render thread limit by Dx9 - Dx11, AVP2010 is the best example with 1 thread 99% of the time @ 95-99%.

    check these slides here, dx11 pipleline vs dx12 pipeline.
    http://wccf tech.com/amd-directx-12-async-shaders-multithreaded-command-buffer-dx12/
     
    Last edited: Jul 24, 2015
  13. Barry J

    Barry J Ancient Guru

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    Last edited: Jul 24, 2015
  14. MrBonk

    MrBonk Ancient Guru

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    It is not intended to be left on globally.
     
  15. aufkrawall2

    aufkrawall2 Master Guru

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    Of course it is, it can be enabled globally in the official control panel.
     

  16. tsunami231

    tsunami231 Ancient Guru

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    so can fxaa but that not ment too be enabled globably and general is bad idea to be too, just cause it can be enabled globally dont mean it should be, just means there is option to do so if one wants too.
     

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