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USB latency skyrockets under CPU load in a VM

playX281
in VM Engine (KVM)

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Hello! I am using unRAID on my home-server/workstation. It is used as a NAS/hypervisor for my desktop OS which is CachyOS Linux or FreeBSD. Recently I noticed that when CPU cores are loaded (e.g building something from source) it makes USB passed through to one of VMs latency skyrocket: mouse becomes unresponsive or moving cursor takes a few seconds, same goes for keyboard.

 

Is there any reliable way to fix this without passing through entire USB PCI interface to my desktop VM?

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