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

Locked Question. This question was migrated from the Microsoft Support Community. You can vote on whether it's helpful, but you can't add comments or replies or follow the question.

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  1. Anonymous
    2019-06-17T12:53:03+00:00

    My hunch is Microcode is causing this and nobody can figure out how to fix it,but Control Flow Guard is my second guess.

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  2. Anonymous
    2019-06-17T12:55:32+00:00

    I had Control Flow Guard disabled and that didn't really change anything.

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  3. Anonymous
    2019-06-17T13:05:23+00:00

    Not too sure it can be totally disabled even when its turned off.

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  4. Anonymous
    2019-06-17T19:50:52+00:00

    After 1903 update I have done what I always have to do to avoid latency problems that interfere with sound (glitches, pops, etc). What works for me is to disable in "device administrator" panel the "High Definition Audio Controller". In my case it appears twice: one for the Realtek audio chip and one for Nvidia HDA. I use an audio interface via USB and the only audio drivers in use are the steinberg (yamaha). Otherwise if I don't disable HDA Controller (Microsoft) the driver hdaudbus.sys give problems of latency.

    After this 1903 update I had at first ntoskrnl.exe  spikes of 4000 microsec. and after disabling the two HDA Controller the problem has gone. Besides I follow the general advices to work with sound in windows (power settings, CPU throttle, performance settings, etc.)

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  5. Anonymous
    2019-06-19T17:40:48+00:00

    Hello to all,

    at first i dont have a solution aswell. I just would like to solve mine. After update to 1903 i have suddenly random videlo glitchecs on netflix app ONLY on full screen. 

    I have two latency spikes.

    dxgkrnl.sys - 1700 µs 

    ntoskrnl.exe - 1700 µs

    My pc setup is following:

    Asrock Z97

    i7 4790k

    RTX 2070

    16gb RAM

    If anyone would have idea what to check it would be great. I am almost about to reinstall system completely to 1803 and just dont go to 1903 until problem is solved, but just the idea is killing me....

    Thanks!

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