Yet another case of DPC latency -- this is driving me crazy

[johninbigd]

I'm running into regular DPC latency that is caused by wdf01000.sys, but I can't figure out the underlying cause. I'll attach the output of Windows Performance Analyzer to this post. Here is my system:

OS: Windows 7 64-bit
Mobo: Gigabyte 990FXA-UD3 rev 3, driver version FC (latest)
Drives: SSD + two HDD (all SATA)
Video Card: nVidia GTX 970 FTW (latest non-beta driver available)
Audio interface: Focusrite PRO 14 connected via FireWire
USB devices: Mouse, keyboard, old HP laser printer

I get regular cracking in my audio when using the Focusrite interface. DPC Latency Checker looks like a comb (spike, two dips, spike, two dips, etc.) The spikes are up to 2000 microsends consistently. I've tried disabling the non-critical devices in Device Manager. I've updated BIOS, USB drivers, Ethernet drivers, AMD chipset drivers, video drivers... I've tried the legacy Firewire drivers. I've set my system power management to High Performance. I've set my CPU scheduler to prefer prioritize background processes. I've tried physically disconnecting my USB devices and FireWire device. I've disabled antivirus and any other processes I don't need right now. Absolutely nothing I've tried has made the slightest dent in the latency spikes. I'm at a loss. I really have no idea what to do next. Any help would be greatly appreciated. Hopefully you have better advice than my buddy who simply said, "Get a Mac."

Thanks!

 

[johninbigd]

Holy cow.... I may have just figured it out after spending about six hours at least on this. I thought I had disabled all apps that I didn't need, but I just noticed that Gigabyte Easy Tune software was still running. I disabled that and my latency immediately cleared up! Wow.... Unbelievable. I don't even use that app. It just came as part of a bundle of tools with my motherboard.

So, mischief managed!