DPC Latency problem

Artur · Jan 21, 2014

Hi guys! Can anyone help me, please? I'm so tired of this.

I've bought usb audio interface and started to notice clicks, pops and etc.

I've turn off my Wi-Fi and other network drivers, then i analyzed my dpc latency with software called LatencyMon. So my problem is Wdf01000.sys.

I've made some analyzes with this tutorials: https://www.sysnative.com/forums/wi...other-dpc-latency-problem-audio-glitches.html and https://www.sysnative.com/forums/wi...ues-with-wpa-windows-windows-vista-7-8-a.html

Here is my .etl files and LatencyMon stats - Download ETL_Files.zip from Sendspace.com - send big files the easy way

Help me please! Thank You!!!

Artur · Jan 22, 2014

Ok, guys! I found some tutorials and disabled many devices on my laptop. So my problem with wdf01000.sys is gone. But i steel have some high spikes from USBPORT.sys

Here is my new CPU.etl - Download CPU.etl from Sendspace.com - send big files the easy way

Still waiting for some help, please...

Artur · Jan 25, 2014

Looks like no one can help me. Sad.

TomasD · Jan 25, 2014

Hello Artur,

sorry for a delay.

Since you clearly know the issues started after connecting a new audio interface via USB, there's really no reason to suspect other devices (like network adapters). It relates to the new device and that might few reasons for the issues:

Are you absolutely sure you are using most recent driver for the audio interface (what is the vendor/model of it)?
Have you tried connecting it to different USB ports (especially USB 2.0 instead of USB 3.0, if your PC have one)?
Is your Windows fully patched (all updates installed)?

By the way, I'm really curious what devices have you disabled to reduce DPCs with from Wdf01000.sys?

Artur · Jan 26, 2014

Hi, first of all thanks for the reply.

1. I'm sure, i'm using latest version of driver for my sound device - Focusrite Scarlett 2i2, driver version 2.5.1
2. My device connected to USB 2.0 port and i've tried another ports including 3.0
3. I've installed last update for windows 8 two days ago.

Artur · Jan 26, 2014

And what about wdf01000.sys, i don't know what exactly i did, but after i followed this steps - Windows 8 Tuning Tips for Audio Processing | Knowledge Base | Support, problem with that process have gone. Now it's all about usbport.sys

TomasD · Jan 26, 2014

What about ASIO settings? Have you tried modifying them as per this thread?

BytorR1 · Jan 31, 2014

Artur said:
And what about wdf01000.sys, i don't know what exactly i did, but after i followed this steps - Windows 8 Tuning Tips for Audio Processing | Knowledge Base | Support, problem with that process have gone. Now it's all about usbport.sys

I've joined this forum so I can hopefully enlighten a lot of Win8.1 "Standard" users who have suffered with the DPC Latency issues like I have for so long and tried everything from disabling/re-enabling/re-installing/updating any and every device driver in Device Manager without success! I'm running an ASUS Q500A i7 with 16GB of RAM and a Crucial M500 960GB SSD and was still haviing the pops and bangs associated with audio and video playback - until today!!

Microsoft have finally added to their Knowledge Base a roll-up update which includes a fix for latency issues (KB2911106) it includes KB2910642 which is itended as a fix for Windows Media Player but it has all but resolved my issues when trying to listen to 192/24 & 96/24 HD audio via Mediamonkey and Foobar2000 which were previously almost unlistenable.

Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2 update rollup: January 2014

I hope this helps out anyone who thought that there was no foreseeable light at the end of the tunnel on this one from Microsoft!!

Regards,

BytorR1

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DPC Latency problem

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