The DPC Latency Checker is for internal PC operations. The Latency for your recording interface device is a separate issue. The DPC "Latency" Checker maybe should have be renamed something else so as not to consfuse its results with latency in a recording device.
An good example is a problem I ran into. I use a Roland Octa-Capture that has low latency (if the buffer is set correctly). I noticed I was getting some random clicks in a recording, so I ran the Latency Checker and it showed a large spike about every 4th sample that the DPC Latency Check program displayed. However, I also discovered that when I installed my Octa-Capture on my new PC I forgot to set the buffer size for low latency. When I did that the clicks in recording went away, but the Latency Checker program still showed the large spikes. The large spike problem turned out to be a system monitoring program that I inadvertantly installed from the motherboard vendor. When that program was uninstalled the DPC Latency Spikes went away.
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