DPC Latency problem (Storport.sys, nvlddmkm.sys, dxgkrnl.sys, etc.)

empleat said:

You didn't answer my question: how is your DPC latency now? Also you can usue BSOD viewer to get exact error code and message to troubleshoot your problem!

Yeah that flicker is weird, be sure in your drivers to choose dedicated GPU! And max refresh rate on your monitor. What kinda monitor is that and what cable you are using?! (you should probably get certified Display Port/HDMI cable! Some bad cables can even destroy your GPU!) Also you can go to windows setting/system/display/graphical options/browse/pick program/options and choose your dedicated gpu, which should be under high performance!

I never had problem with flicker so i don't have much idea what it could be! Try to google it! Do you use G-SYNC? G-SYNC can cause flicker and turn v-sync off for sure! Or it could be variable refresh rate, which is in same category as path above! Also that looks kinda like TV, tv has some sort of motion smoothing like frame interpolation. So turn that off, if it has that!

Sorry that I forgot to respond, here is two screenshots from LatencyMon:





It is always the Nvidia Windows kernel driver that is the highest in term of latency, sometimes it is DirectX kernel. However I have not been able to fix those two spikes.

The screen in the video is actually my laptops screen. It only has 240hz mode (no 60hz mode is available) so I'm using highest possible right now. I am also not using v-sync or g-sync on my laptop screen.

I believe it is an issue with Nvidia Optimus or something like that, but I'm using the latest drivers from Nvidia/Intel's websites and they issue still persists.

VirtualBoost said:

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These spikes to 600 are normal, it happened to me on old computer and sometimes on my new as well! But it is definitely high, yet this shouldn't be cause of cracking i believe. DPC latency now looks ok!

So did you try linux live usb, if it is not headphones, than it could be still Windows as it was in my case! Or it could be soundcard, try cheap usb soundcard, when your soundcard is disabled, or nvidia HD audio! Or if your headphones have external soundcard over usb! Also with disabled sound card in BIOS/Device Manager!!!

Again, do you have variable refresh rate off? You use dedicated GPU right, otherwise i don't know what could cause flicker sorry!

Cant you just disable optimus and use dedicated card instead? I think you don't have to even switch manually, in that path in windows, you can choose which card to use when program is on!

empleat said:

These spikes to 600 are normal, it happened to me on old computer and sometimes on my new as well! But it is definitely high, yet this shouldn't be cause of cracking i believe. DPC latency now looks ok!

So did you try linux live usb, if it is not headphones, than it could be still Windows as it was in my case! Or it could be soundcard, try cheap usb soundcard, when your soundcard is disabled, or nvidia HD audio! Or if your headphones have external soundcard over usb! Also with disabled sound card in BIOS/Device Manager!!!

Again, do you have variable refresh rate off? You use dedicated GPU right, otherwise i don't know what could cause flicker sorry!

Cant you just disable optimus and use dedicated card instead? I think you don't have to even switch manually, in that path in windows, you can choose which card to use when program is on!

Hi again!

Sorry for the late reply! I have now tried a few things (like double checking my drivers as well as disabling IPv6 on my Wi-Fi adapter). This seems to have helped a lot, especially with tcpip.sys spiking a bit. The only left that spikes a lot seems to be nvlddmkm.sys which is tricky to fix for sure. Do you have any ideas?

Here's a screenshot from my latest LatencyMon test.

VirtualBoost said:

Hi again!

Sorry for the late reply! I have now tried a few things (like double checking my drivers as well as disabling IPv6 on my Wi-Fi adapter). This seems to have helped a lot, especially with tcpip.sys spiking a bit. The only left that spikes a lot seems to be nvlddmkm.sys which is tricky to fix for sure. Do you have any ideas?

Here's a screenshot from my latest LatencyMon test.

Nvidia cards are known to spike, even on desktops and high end card. Only thing you can do is disable power saving and turn on msi for gpu. It can worse mouse movement tho, it differs per pc.

I don't think DPC latency is cause of your issue anymore, last time as i said: it was already in okay levels. Did you try other system on your laptop like live linux? To make sure it is not windows. Either that, or it is faulty hardware!

Or you don't have cracking issue anymore and just want to help with DPC latency? This is already decent and on notebook. And there is only so many things you can do! As DPC latency is caused by badly coded drivers, more then hardware configurations! With nic, i would refer you to speedguide.net which has great amount of guides for optimization! SG :: Network Adapter Optimization - tweak your nic by this guide, disable turn of device to save power definitely! I suppose your nic drivers are up to date at this point...

And also check broadband/registry tweaks.

Also what helped me with DPC latency for nic - tweaking amount of transmit/receive buffers. You can try 256/128 e.g. Just a tip, always but computer with Intel nic!

You could also try messing with your interrupt priorities in msi_util2. E.g. set device with most interrupts to higher priority! But usually undefined, with exception of setting nvme and sata controllers to high is best. At least for me.

Also refer to blackviper.com for safe setting and disable useless services you don't need. Services cause high dpc latency in windows also! Or i can give you list of what i have enabled...

Also you can download process lasso and set some system processes to 1 core only. This helps too, i do this only for non-essential services. Except like DWM. I didn't test this method much yet: Windows 10 DWM Priority - Blur Busters Forums

Also this is good guide for input lag BTW: I'M SO CLOSE TO FINISHING MY INPUT LAG! - Blur Busters Forums Could help to get some cpu cycles back too.

empleat said:

Nvidia cards are known to spike, even on desktops and high end card. Only thing you can do is disable power saving and turn on msi for gpu. It can worse mouse movement tho, it differs per pc.

I don't think DPC latency is cause of your issue anymore, last time as i said: it was already in okay levels. Did you try other system on your laptop like live linux? To make sure it is not windows. Either that, or it is faulty hardware!

Or you don't have cracking issue anymore and just want to help with DPC latency? This is already decent and on notebook. And there is only so many things you can do! As DPC latency is caused by badly coded drivers, more then hardware configurations! With nic, i would refer you to speedguide.net which has great amount of guides for optimization! SG :: Network Adapter Optimization - tweak your nic by this guide, disable turn of device to save power definitely! I suppose your nic drivers are up to date at this point...

And also check broadband/registry tweaks.

Also what helped me with DPC latency for nic - tweaking amount of transmit/receive buffers. You can try 256/128 e.g. Just a tip, always but computer with Intel nic!

You could also try messing with your interrupt priorities in msi_util2. E.g. set device with most interrupts to higher priority! But usually undefined, with exception of setting nvme and sata controllers to high is best. At least for me.

Also refer to blackviper.com for safe setting and disable useless services you don't need. Services cause high dpc latency in windows also! Or i can give you list of what i have enabled...

Also you can download process lasso and set some system processes to 1 core only. This helps too, i do this only for non-essential services. Except like DWM. I didn't test this method much yet: Windows 10 DWM Priority - Blur Busters Forums

Also this is good guide for input lag BTW: I'M SO CLOSE TO FINISHING MY INPUT LAG! - Blur Busters Forums Could help to get some cpu cycles back too.

Hi again!

So I decided to resolve this thread after a long time since I received a new computer from Dell, that seems to be working better. Also, I decided to get a USB headset (Razer Blackshark V2) to work-around the issue for now.

I will mark the thread as solved. Thanks everyone for helping me out in this thread, hopefully the information here can be helpful for some people.

OMG reading Dell is causing my eyes to bleed! Why would you do that? Dell SCAMMED Me - $1500 PC Secret Shopper 2 Part 4 - YouTube You would be better off building your own PC, it is actually easier than people think! Did they sell you extended warranty?
Oh no! USB headphones cause huge DPC latency, as they use USB sound card, which generates tremendous amount of DPC latency!!!