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

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

Same problem here.....

UPDATE

turned off my Kasperski AV no latency anymore

UPDATE2

nevermind still have, but after small windows update its lees than before

I posted this in June 17 and I have to update it because I have found a very important change:

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.)

Still I was having some ntoskrnl.exe spikes something like one every four minutes. And then I remembered another useful tweak to deal with latency in Windows: to disable audio on-board in the BIOS. I used to have the audio chipset disabled in the BIOS but I enabled it again months ago to use a certain program. Well, I have disabled it again and the ntoskrnl.exe spikes are gone. I have tested with latencymon for 30 minutes.

Now in device administrator there is only one "High Definition Audio Controller" (Nvidia) and it is disabled. And the active sound device is the USB audio interface. My desktop is an old HP Pavilion Slimline (2009). I don't know if this is definitive solution. But it seems there has been a change.

that is escentialy the same lag spike. the dxgkrnl.sys is the graphics system making a hardware interupt request to the ntoskrnl.exe. im having this same issue using an NVIDIA 1070 gtx. one sugestion was to dissable all of the sound devices on the cards. i do not knownif this makes a difference. i havnt tested it yet. reinstalling drivers didn't help.

Thanks for that.It seems that MS,driver vendors and computer manufacturers are not on the same page with 1903.This why 1903 is a nightmare to troubleshoot.

Indirectly I am. but they are stutters that are caused by the high latency audio popping and clicking. it just doesn't pop and click, it stutters anything that is using the audio. I notice the problem gets worse when I am doing anything streaming heavily and it alleviates a lot when i disable the network driver completely.. which is the only way I am able to do music nowadays