High DPC due to Nvidia Kernel Driver?

Tephnos · 3 Oct 2015 at 16:27

Silent_Scone said:
Not really, these type of application aren't applicable to most users - nor is the latencies you are seeing on your rig

True, but still.

Have you attempted what I did that raised the latency to see what happens on your end?

Going to see if I can grab the KFA2 Infin8 Edition that's on offer right now whilst returning my old one for no downtime. I'm just trying to figure out if that KFA2 model has the fans spin down when idle.

gthlm · 3 Oct 2015 at 16:28

Silent_Scone said:
Not really, these type of application aren't applicable to most users - nor is the latencies you are seeing on your rig

True, most people don't need low latency for realtime and most people won't be affected by ms spikes.

But when it matters, it matters.

Silent_Scone · 3 Oct 2015 at 16:38

Of course, then the working environment as a whole is retrofit in most cases. Including the lack of Windows and any HRET. Most of us just want to do a bit of messing around ;p

Tephnos said:
True, but still.

Have you attempted what I did that raised the latency to see what happens on your end?

Going to see if I can grab the KFA2 Infin8 Edition that's on offer right now whilst returning my old one for no downtime. I'm just trying to figure out if that KFA2 model has the fans spin down when idle.

As in what? Open Chrome?

Tephnos · 3 Oct 2015 at 17:36

Silent_Scone said:
Of course, then the working environment as a whole is retrofit in most cases. Including the lack of Windows and any HRET. Most of us just want to do a bit of messing around ;p

As in what? Open Chrome?

Open chrome, then pull out a tab into its own window a few times. Seemed to bump up the DPC execution count for me to 1000+ and I got the 'you may experience problems' line.

wazza300 · 3 Oct 2015 at 17:44

ran the render test in gpu-z and see if the latency reduces? could be down to the gpu idle state

Tephnos · 3 Oct 2015 at 18:08

wazza300 said:
ran the render test in gpu-z and see if the latency reduces? could be down to the gpu idle state

Didn't yet, but I suspected an idle state, I previously mentioned it would jump up when the screen turned off, seems like something is wrong with power management in the card somewhere.

wazza300 · 3 Oct 2015 at 19:29

some makes/models of gpu/mb or psu create dpc more or less it depends,any coil whine along with it?

Tephnos · 3 Oct 2015 at 19:30

wazza300 said:
some makes/models of gpu/mb or psu create dpc more or less it depends,any coil whine along with it?

None that I notice, actually. Thought the GPU was fine until this all showed up. Since it is seemingly the main cause of my audio dropouts its unacceptable.

Just hoping the KFA2 Infin8 is a decent buy, bugger all info on it except for a good price.

Tephnos · 4 Oct 2015 at 21:53

Update:

Someone on OCN with the exact same issue as me on a 960 GTX has replaced the card and his issue are now gone.

Looks like it really is a HW fault in the card at this rate.

Tephnos · 7 Oct 2015 at 20:00

Further update:

Acquired another 980Ti to test this issue with before raising it as a fault with OcUK:

xperf trace with both L4D2 and Shadow of Mordor gaming. SoM had less latency than L4D2.

Second trace with more L4D2 (was my testing game when using latencymon as I could get it to spike easily there).

Seems a replacement GPU did the job after all based on these.

Rofflay · 8 Oct 2015 at 02:38

Not sure what i see there, Visual overload and really tired but insomnia is kicking in.

I see the TCPIP dropped by half or so, what else can i be pointed too and can anyone run this? L4D2 is still my favourite. When i test that i open latencymon and let it settle, Then i run the game and quickly dive out or do windowed to see my dpc.

I never remember going over around 45-50us in intensive gaming, 28us for Youtube 1080p and 2-6us idle. Sometimes i will see Nvidia driver showing at max 120us but that must be a brief spike i never see it when watching weirdly. That is how i like it though and it keeps me happy. Hopefully you get there too.

Tephnos · 8 Oct 2015 at 02:55

Rofflay said:
Not sure what i see there, Visual overload and really tired but insomnia is kicking in.

I see the TCPIP dropped by half or so, what else can i be pointed too and can anyone run this? L4D2 is still my favourite. When i test that i open latencymon and let it settle, Then i run the game and quickly dive out or do windowed to see my dpc.

I never remember going over around 45-50us in intensive gaming, 28us for Youtube 1080p and 2-6us idle. Sometimes i will see Nvidia driver showing at max 120us but that must be a brief spike i never see it when watching weirdly. That is how i like it though and it keeps me happy. Hopefully you get there too.

Is that DPC time or interrupts? I'd be surprised to see a highest DPC execution time below a few 100. You average of 2-6 idle though is pretty insane, I only ever go as low as 7.

Rofflay · 8 Oct 2015 at 03:21

Tephnos said:
Is that DPC time or interrupts? I'd be surprised to see a highest DPC execution time below a few 100. You average of 2-6 idle though is pretty insane, I only ever go as low as 7.

Not sure which lol that is the DPC time i think where it will go in realtime from 2-6 and spike to maybe 12 then fall to 3 again. This really is my DPC but i have gone OCD and turned off everything in the bios, Use like 2 usb devices and have 5 drivers and Chrome 64bit and tweaked windows with again things disabled. That is literally it so not suprising when you put in weeks of testing and learning. Heck my plan next is to trim running programs further get rid of Afterburner for something like FTRC but AMD suck for VSR.

I used to get high spikes and a red error but now like magic my max interupt will be 120-150us. My highest is normally Nvidia C-Media or USB.sys.

Tephnos · 8 Oct 2015 at 03:23

I mean when running latencymon, the first 3 graphs relate to interrupts, those are the worst if they spike. The second to last one is the highest DPC execution time, and its not unusual to see that one at a few 100s.

What did you turn off in the BIOS? Power saving stuff like C-states and EIST?

May as well as list everything for others who show up and may have similar issues.

Rofflay · 8 Oct 2015 at 03:27

Everything i do not use goes off, All powerstates and i OC my 4770k to 4300mhz on core and northbridge. The ram also runs at 2400MHZ 1T which i bet helps in a miniscule way.

In the bios i will disable unused ports too, Like drives, Fan headers, USB slots and PCI-E slots. Pretty much every setting now i know by heart and know if it can be turned on or off. Then move onto windows with pretty much barebones drivers to get L4D2 running. And that is me done until i take into disabling windows features too.

Tephnos · 8 Oct 2015 at 03:28

Ah, okay.

Did you post latencymon results in this thread at any point? Would be interested to see what you're getting when trying to make it lag on purpose.

Rofflay · 8 Oct 2015 at 03:31

Hmm maybe a long time ago it was built last year, And at the minute it is idle due to other things. How do you make it lag again? At the minute i am so bored of gaming that i do not think i will be going on it again for another week or two.

But it never changes now it has been learned and done. I could format and do the bios with my eyes closed at the minute. Components might also be a factor like Wazza said? The drivers i use are semi old for my 980, And i made sure to match up all Digital IR/Power with the UD4H-Z87X and AX860I. No coil whine either of any kind.

Tephnos · 8 Oct 2015 at 03:33

Rofflay said:
Hmm maybe a long time ago it was built last year, And at the minute it is idle due to other things. How do you make it lag again? At the minute i am so bored of gaming that i do not think i will be going on it again for another week or two.

But it never changes now it has been learned and done. I could format and do the bios with my eyes closed at the minute. Components might also be a factor like Wazza said? The drivers i use are semi old for my 980, And i made sure to match up all Digital IR/Power with the UD4H-Z87X and AX860I. No coil whine either of any kind.

No coil whine here either, matched up a leadex with the x99 as there was problems with Seasonic in the past apparently.

I usually got the DPC execution time to jump up by dragging a tab out of chrome and letting it become a new window, by letting the monitors turn off after a few minutes, and by loading up games.

Rofflay · 8 Oct 2015 at 03:35

Yea just plain weird, Mine i remember as a usb logitech mic

When i would run it with ventrilo it would give red errors of 1ms, And i remember blaming HPET too. After that and my OCD tweaks/disabling frenzy i ended up with insane latency and my mic into my soundcard via 6.2mm.

Outragous perhaps 2us even for a second is remarkable on 8.1 64bit. Eager to swap and see Win10 soon. Will keep an eye on the thread going to bed now though.

humbug · 8 Oct 2015 at 13:31

Got this with Firestrike running.

The Nvidia Driver is not too bad, its not great but not bad.

The Microsoft DirectX Driver is much worse.