Fairly high CPU load after passing through USB serial device

[Loredo]

Hi folks,

I'm running Proxmox VE 3.3 on my home server (Intel NUC i5) with very high satisfaction

I had to connect a USB serial dongle device to one of my virtual KVM hosts so I added "usb0: host=2-4" to it's configuration file as stated in the Wiki.
It's working fine in general.
However, CPU load is now 20-30% so I guess the interrupts caused by the USB passthrough is fairly high.

Is there any way to bring it down? The USB device is actually a fairly low performance device, only a few bits via serial command.

Appreciate any help.


Cheers,
Julian

 

[Loredo]

Now that I wasn't able to find any solution, I removed the USB dongle from the virtual machine and installed it's software on the Proxmox host instance itself. Not a good solution, but it works.