USB dropping/delaying packets

[digitalgimpus]

I'm trying to run an ads-b receiver in a VM, but running into issue with USB support. Seems like USB packets are delayed/getting dropped resulting in inability to do things that require more precise timing.

I found a thread here of people who have had this issues with other virtualization environments, but not proxmox.

https://discussions.flightaware.com/t/server-status-clock-unstable/19482/23

Wanted to see if anyone encountered the same, or something similar in nature, and if there's any suggested things to try. As of yet I haven't found anything regarding prioritizing USB.

 

[leesteken]

Yes. I have seen bandwidth and latency issues with USB passthrough on this forum. Enabled USB3 tends to help (also for 2.0 devices). Still my keyboard drops a keypress once in a while but a bluetooth receiver appears to work fine. I used to use it for a USB DVB-C tuner, but the CPU overhead was very high and it was unstable with HD-TV.
The alternative is PCI passthrough of a suitable USB controller, but this is also a bit of trial and error and much more technical.

 

[digitalgimpus]

I've already got USB3 enabled, so that's ruled out.

I've got limited PCI slots on this host, so a dedicated PCI card to passthrough a controller isn't really practical either :-/

 

[leesteken]

Can you run the required software on Linux? Then you can pass the device to a (unprivileged) container via a bind mount (with some user and group mappings).
EDIT: The device drivers will need to run on the host though, and it is some work if kernel 5.11 does not already support the device out of the box.