virtualbox.org

Hi everyone.

I use Linux Mint 19 as a host and Windows 10 Pro as a VirtualBox as a guest. I use high-speed USB industrial cameras which talk to Windows programs that we develop.

I have 16 gigs of memory. If I allocate 3072 megabytes of memory to Windows, everything works great. If I allocate 4096 megabytes or more of memory, the USB transfers fail, and I can only use the camera if I slow the frame rate way down.

I saw this same problem on my old I5 system. I have a brand new I7 system with SSD and I rebuilt the host and guest from scratch, but I still see the same thing. As long as I give Windows < 4 gigs, the cameras work fine. If it has 4 or more, they don't.

Any ideas why this might be occurring? Is there something magical about memory mapping which changes? Why would that impact USB?

Thanks,
Dave

Please provide a VM log file. With the VM fully shut down, right click it in the GUI. Select "Show Log" and save "VBox.log" (no other file) to a zip file. Attach the zip here.

The zip file contains:

3072.log when memory was set to 3072 and the camera worked fine
4096.log when memory was set to 4096 and the camera did not work correctly

There is nothing obvious in the logs. You should head to the bug tracker and either search for an appropriate bug, or open a new bug report where you'll attach your logs and other vital information.