High DPC Latency

Sorry to have to start another thread, but I just found another 'issue' with my laptop.
I get extremely high DPC latency (average 1000us).

I originally noticed it when playing Call of Duty, some of the sounds would distort/pause a bit.
EG: Normal sound: "U.A.V. Recon", Right now: "U. aiaiaiiaiai Veh. Recon"

I'm not sure if it is the high DPC that's causing it, but I would like to fix this high DPC either way. From what I've found from google, ~50 - ~300 should be normal.


I have already tried disabling devices like the webcam, battery, wireless, and network card.

 

I am answering so late because I had(have) a similar problem of my own, and I saved this thread until I had the time to investigate it.

I also had extremely large latencies, but in my case the solution was simple: the Atheros WLAN driver is bad, so I disabled the card. Here are some screenshots:

Before disabling the WLAN device in DevManager. The marker shows an instance where I actually turned the wireless card on. You notice it is spiking continuously.
http://img.photobucket.com/albums/v58/trieper/dpclat_alltypicaldevicesenabled.png

After disabling the WLAN device in DevManager:
http://img.photobucket.com/albums/v58/trieper/dpclat_wlandisabled.png

Have you tried running RATTV3 from Microsoft? http://www.microsoft.com/whdc/DevTo...as better related to my real-life experience.

 

Which device exactly did you disable? I tried disabling all network related cards with no luck.

From what I remember, RATT showed me ~200ms for usbport.sys. Can't remember the exact name, but it's something like that.

 

I disabled the WiFi card, namely "Atheros AR928X Wireless Network Adapter" -- I'm talking about my F6Ve.

Does the lag still stay if you disconnect all USB devices (mice etc) and disable all internally-connected USB devices (webcam, OLED, fingerprint reader). Also try disabling the touchpad but be sure you have a working external mouse. All these devices are I think connected internally via USB and may cause the lag.

If you can't isolate the issue like that:
You could try disabling USB Universal Host Controllers in turn; hopefully one of them is the cause, and again hopefully nothing important is connected to that controller.

 

Wow I thought I remembered trying to disable it before. I disabled the WiFi and now it went from a constant 1000us to 50-400us.

Problem is, how am I going to connect to the internet? Any other way to fix it?

 

Well you need a better driver... try going to the wifi card manufacturer's website and see if you can get an updated driver. Otherwise check ASUS' support site, maybe they have a new driver (or perhaps an older one, even, although that's more likely to have the same bug).

 

I am sorry for bringing this thread from the dead, however, I have Atheros AR5009 Wireless adaptor on a HP Pavilion dv6-2043Ca laptop.
I have the same DPC latency issues, where it is in the 100's for most of the time, but spikes up to 4-6k at times.
I have the latest driver for it, and I did confirm the Adaptor to be the problem (I disabled it and checked DPC Latency)
My question is: Is there any way to solve that problem without any unnecessary changes (Like switching OS or digging for more updates?), since I am a gamer, those issues cause me a lot of stress and rage...

 

I don't use WiFi almost at all so I keep it disabled and I'm not affected by the problem... besides a driver update I don't know what else to suggest.

 

I've tried several NICS and clearly some are worse than others, but they all eventually show DPC latency spikes and therefore affect the audio.

If I disable the network adapter (NIC), latency immediately drops to green levels and sound is good. However, if I then enable the network adapter, it immediately spikes perpetually into the red and I hear the crackles and stutters.

I'm using the latest drivers. What is the commonality that causes this? I've never had this problem in any other OS. Is it a problem in Windows 7? Or should I be looking at my Motherboard?

Please help! This is driving me crazy! I can't listen to music, unless I reboot first.

 

I have the problem in WinXP, it is not Windows-version-specific.

I suspect it's simply poorly implemented drivers (conflicting with some hardware perhaps).

 

AFAIK, this problem arise when you have 2 active network devices.

I got similar problem with my Infenion and onboard (Atheros) network cards on my PC. Once I disabled Infenion one, I got no more latency problem.

My laptop shows no sign of this problem, but I usually turn off my wireless if I plug a network cable on it.

 

Hmm that might actually be true. Whenever I had the DPC problems due to the WiFi card, I was in fact connecting to the network using the wired Ethernet card.