December 30, 20214 yr Hi Folks I've been passing through both an on-board (HP 350ML Gen8) USB2 controller to an Ubuntu VM for sometime with no issues; perfect. However, it seems that something has changed. The device I'm passing through, a FlightStick Pro SDR device, is low power and, along with another couple of devices, works perfectly well (using a fibre to USB convertor to cover some distance and isolate the power for radio work)...issue is one of 'timing' and potentially dropped data from the USB device. https://discussions.flightaware.com/t/re-mlat-timing-issue-error-configuration-check/80767 https://github.com/wiedehopf/adsb-wiki/wiki/mlat-in-VMs There are some 'Proxmox' settings...anything to suggest for QEMU? I've moved the hardware over to a Raspberry Pi4 and no issues what so ever. Testing the VM with passthrough of a USB3 Renisas card, also highlights 'clock timing issues'. Is there any best practice of how to check / tune USB pass-through performance? As mentioned, the devices pass-though fine, performance and 'timing' seems to be an issue. Will the controller type on the VM make any difference to the configuration of the pass-through? Are there any settings / manual changes I should look to make? Thanks Mo
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