Windows 10 v1903 - ntoskrnl.exe & ISR/DPC latency spikes

Anonymous
2019-05-31T18:33:50+00:00

Hi,

After updating to 1903 LatencyMon associates ntoskrnl.exe with large latency spikes on the order of ~1,300µs. Same results with KB4497935.

I posted here too as I thought it could be related to the GPU driver:

https://forums.geforce.com/default/topic/1120890/geforce-drivers/win10-ver-1903-ntoskrnl-exe-large-latency-spikes-/

Others are also reporting similar symptoms. E.g. in some instances this results in noticeable audio clicks/pops.

https://www.reddit.com/r/Windows10/comments/bu34xv/update_1903_high_dpc_latency_issues/

Are you seeing similar results?

Does anyone at Microsoft acknowledge this?

It should be easily reproducible.

Thanks,

Howard

SOLUTION:

KB4505903 seems to have significantly mitigated the ntoskrnl.exe latency spikes for many users.

Windows for home | Windows 10 | Performance and system failures

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  1. Anonymous
    2019-06-03T20:08:13+00:00

    So much going on with 1903.Keep getting hal.dll and ntoskrnl.exe blue screens according to blue screen view.Updated all drivers with device but no luck.

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  2. Anonymous
    2019-06-10T12:18:52+00:00

    Same issue in here since i'm on 1903, stutters on playback for Netflix UWP.

    Didn't have any issues on 1809. Drivers were upgraded and nothing worked. 

    Please fix latency issues, those are noticeable.

    I'd to rollback to 1809, no issues. One of my PC is still 1903 and latency is high.

    Regards.-

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  3. Anonymous
    2019-06-10T13:13:23+00:00

    Same issue, ntoskrnl.exe causing dpc spikes and 1903 update is the issue since 18009 was fine.

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  4. Anonymous
    2019-06-16T17:05:15+00:00

    SOLUTION (or at least a major factor):

    A member on the Nvidia forums pointed me to the Turn off Power Throttling setting and it seems to have significantly mitigated the ntoskrnl.exe latency spikes.

    I highly recommend that you try this. It's probably best to change the setting via gpedit.msc vs just the registry. Don't forget to reboot / re-login.

    https://www.windowscentral.com/how-manage-power-throttling-windows-10

    UPDATE: Nevermind, did some further testing and this seems inconclusive.

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  5. Anonymous
    2019-06-16T17:21:16+00:00

    Have tried your proposed solution, it did not mitigate ntoskrnl.exe latency spikes on my Ryzen system.

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