Am 25.12.2018 um 17:52 schrieb Paige Thompson: > Hi, > > I have a very long standing problem that I've recently been trying to root cause and document. As near as I can tell the problem is rooted somewhere in Windows itself and/or the virtio drivers for Windows. I believe it must be one of the windows virtio drivers because: > > - Both of my DACs work perfectly fine connected to a Windows laptop running Windows on metal > - A Linux guest with the same VM configuration doesn't have this problem when using either of my DACs to play back audio > - I've been able to eliminate the problem intermittently on Windows (It was working fine yesterday until a large batch of Windows Updates were installed.) > > Even so, I want to know who out there has tried getting a USB audio DAC to work with a Windows Guest on KVM/QEMU? I'm using a USB3.0 pcie card that is passed through to the guest, I haven't been able to get it to work any other way really.
Hey, I'm using a SMSL Q5 Pro DAC in my setup without problems, along with USB headsets (Plantronics DSP500/Sennheiser PXC550). However, I haven't done anything special to get them working right. :/ For USB3 passthrough I'm using a Sonnet Allegro Pro USB PCIe card (on a Asrock OC Formula X299 with an Intel i9-7980XE@4.5GHz with the performance governor active). I've attached my domain's xml. I've read the first entry in your gitlab post. Perhaps we don't share the same workloads/setup which causes the problem. Running the heavy IO load dd command doesn't cause stuttering in my VM (but reading from urandom is also a very CPU intensive task. I get ~200MB/s disk write activity when reading from /dev/ urandom vs. 560MB/s when reading from /dev/zero). Regards, Jan
vm-cpu0-0.xml
Description: XML document
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