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Name Stefan
Date 23-10-2013 (Wed)
category Quartet
Serial No too lazy to look
Country Germany
ㆍvote: 0  ㆍhit: 11746      
v1.25.04 and DPC latency
Well played a bit with the latest drivers.
Not that bad but still audio crackle due to DPCs ...... which is a problen throughout the years with the quartet.
It was pretty poor on my AMD quadcore and turned to be better on my i7, but I wouldn't say it's solved.

While running the quartet at 44.1 I'd say solved. If locking the audio to 24bit 96K problems do start and if going beyond the card is simply senseless with this 1.25.04 driver on Win7.

Running DPClatency analyzed does tell why, but what gives a far better idea is is LatencyMon from since it acutally shows where the misery comes from. It's wdmqua64.sys itself and to be honest this happens with the 1.25.04 driver and doesn't happen with the older drivers. So something must have gone wrong here.

I'll quote a result log from this tool.
DPC routines are part of the interrupt servicing dispatch mechanism and disable the possibility for a process to utilize the CPU while it is interrupted until the DPC has finished execution.

Highest DPC routine execution time (µs):              509,345814
Driver with highest DPC routine execution time:       nvlddmkm.sys - NVIDIA Windows Kernel Mode Driver, Version 311.06 , NVIDIA Corporation

Highest reported total DPC routine time (%):          0,125688
Driver with highest DPC total execution time:         wdmqua64.sys - QUARTET Audio Driver, INFRASONIC

Total time spent in DPCs (%)                          0,432815

DPC count (execution time <250 µs):                   5646129
DPC count (execution time 250-500 µs):                0
DPC count (execution time 500-999 µs):                72
DPC count (execution time 1000-1999 µs):              0
DPC count (execution time 2000-3999 µs):              0
DPC count (execution time >=4000 µs):                 0

problem is , as long as no audio playback happens all is in working condition, but when the quartet get's stressed DPCs raise until dropouts are even detectable without using in ear headphones.

back to the older driver for the moment
this one's too much beta if not alpha

name icon Balint
2013-10-23 07:43
Dear Stefan,

Thank you for your valued feedback, posting the LatencyMon log was very useful.
It seems your Quartet is sharing its IRQ with your nVidia graphics card, which is resulting dropouts in the audio output signal. Please let me know the model number of your motherboard, then I could recommend another PCI slot for Quartet to prevent DPC related problems.
Also allow me to recommend an update from nVidia as well, there are more recent drivers available:
What sample buffer (latency) setting are you using with Quartet?
Thank you for your kind co-operation.

Kind Regards,
SIMS Corp.







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