• Competitor rules

    Please remember that any mention of competitors, hinting at competitors or offering to provide details of competitors will result in an account suspension. The full rules can be found under the 'Terms and Rules' link in the bottom right corner of your screen. Just don't mention competitors in any way, shape or form and you'll be OK.

High DPC due to Nvidia Kernel Driver?

Tephnos

Tephnos

Tephnos

Soldato
Joined
20 May 2011
Posts
6,086
Location
Aberdeen, Scotland
Hi,

Trying to isolate an audio DAC popping issue here.

Running latencymon, I'm sometimes seeing high spikes above 1ms, and always due to the nvidia kernel drivers. Running win10, fresh OS, and a 980Ti.

Is this the same with anyone else, and are nvidia GPUs just crap for DPC latency, or is it the sign of some fault, likely the GPU?
 
Hi,

Don't use a soundcard, USB audio to a DAC only. Don't have the Nvidia audio drivers installed either.

Also I've done multiple re-installations, and the issue has persisted through a G45 chipset and a X99. The only thing I can remember is it starting around Win10 time or somewhere there about, but I've been on Win8.1 since then as well.

Before that I had just gotten the GPU from that Zotac 980 deal. I've also had it happen on a total barebones system with only the necessary drivers installed. Its such a pain.
 
Done, done, done.

Latest chipset driver doesn't touch X99 USB, Nvidia drivers haven't done anything new, made sure USB ports weren't being turned off to to save power, turned off all power saving states in the mobo as they normally cause high DPC.

:(
 
Seems to be a common occurrence with that.

Didn't install any specific controller drivers for this mobo, as I didn't need them, and got all the latest from the mobo site. Problem is this issue is very infrequent, just annoying in its persistence so disabling stuff one by one will take forever.
 
Yeah, there is actually.

Not sure what it really does and if I can toggle it off or on on the ASUS bios. Probably not.
 
Yeah - I can't disable HPET from the looks of it in the BIOS. Unless ASUS have it off by default I'm totally buggered here in regards to that.
 
I have the DAC currently away to repair because of this.

They've had the thing playing on itunes for a week and haven't found anything, so the DAC isn't the issue here.

Looking at my timings in latencymon right now:

Interrupt is anywhere from 30-120.
Highest measured (in 2 minutes) is 126
Highest reported ISR is 129
Highrest DPC routine execution time is 762 (nvlddkm.sys).
 
Apparently HPET is disabled by default on windows 10, so can't be that.

Within 20 minutes the nvidia kernel driver spikes to 2.5ms. Urgh.
 
Rofflay said:
No red errors though just a audio pop right? What happens when you just watch it while playing Youtube or a game? When i would watch Youtube HD i would have around 46us tops but mostly around 28-46us.

I never had popping i just had a warning errors, But i wouldnt look at it and say oh yea Nvidia spike to xxx because everyone gets those. What matters is the red errors, popping or the realtime reading when doing something.


DPC is a downright cow to sort, And Nvidia half the time are 50% to blame too.
Click to expand...

It's on and off. Sometimes it'll stay in the green, other times like with a 2.5ms spike, that's so far in the red it's unbelievable. >1ms is very bad.

Playing a game or youtube is around 30-120 as mentioned. :p

And since I have popping at infrequent times it infuriates me. X99 has been annoying me way too much and its hard to blame it on that since I've switched CPUs/Mobos already.
 
So ISR and DPC routine times should be ignored, and only the first two bars paid attention to?

Also, if it helps I tend to run a VM with V-Tx enabled. No idea if that is known to harm anything.
 
aVewveo.png


Well, damn.
 
Nope, and since this carried over chipset (and so multiple possible drivers) I have no idea where to pinpoint this thing except ragenuking and starting over.

Lets not talk about my USB locking up keyboard issue on X99...
 
To add some more detail, started a new monitoring session (no huge spikes yet), here's the driver tree:

oZOw3Bz.png
 
Rofflay said:
Then expect problems, My DPC is only 2us idle and around 28 with Youtube, Gaming is around 45us but only because i install about 4 drivers and wont use anything USB bar my mouse and keyboard.

I would look at what you have installed, And enabled in that bios because VM doesnt sound good and your graphs clearly show problems. Mine is green all the time no matter what after i slimmed down and eliminated everything.

If you want DPC really low, Seperate your systems for gaming/work imo.
Click to expand...

With the VM off, the latency doesn't change at all, I'll mention I did try that at the moment.

Installation is again very barebones. Seems like I'm gonna have to nuke the OS though if I want any hope of isolating this, which sucks since I don't have a spare PC to mess around on in the meantime. :p
 
siriq111 said:
Not really the nvidia driver makes high dpc latency but the setup of the users rig. We have another thread at guru3d. Worth to check it out.
Click to expand...

Link? Posted driver tree and don't see much being able to mess with it. Help before I drive myself insane with rage. :o
 
Reading through the thread, interesting read.

Damn I picked the worst time to switch to the green team.
 
Okay, so I said **** it and reinstalled Win10 from scratch, and took a latencymon test with absolutely no drivers installed.

Results were good, as expected. Installed the nvidia driver then did another:

SnDWzVm.png


Once all the other drivers were installed I got these results:

56YJypk.png


Basically the same, just a little higher interrupt.
 
You must log in or register to reply here.
Back
Top Bottom