Re: ACRN Project Technical Community Meeting Minuts - 9/26
Geoffroy Van Cutsem
Minor correction on the command to see the USB devices, it’s “lsusb -t”
Happy holiday to all the folks in PRC!
From: Wang, Hongbo
Sent: Wednesday, September 26, 2018 4:15 PM
To: 'acrn-dev@...' <acrn-dev@...>; acrn-users@...; 'info@...' <info@...>
Subject: ACRN Project Technical Community Meeting Minuts - 9/26
TCM Meeting Minutes Archive: https://drive.google.com/drive/u/2/folders/111m6iU3PjSZebOOKzLagYPUWMvseGLeU
ACRN Project TCM - 26th September 2018
1.1 ACRN v0.2 release out, please check out.
1.2 TCM new timeslot survey: can we postpone 1 hour? 10:00PM~11:00PM for PRC, 07:00AM~08:00AM for US West coast time?
Download foil from ACRN Presentation->ACRN_TCM->WW39’18.
Q: Any idea how much extra delay/latency due to the libusb? for example if our use case is realtime audio stream? A: If the USB is assigned to SOS, it doesn’t go through libusb. If the USB is assigned to UOS, the latency hasn’t been measured so far, but the basic test shows fine.
Q: Is there any BKM to find out which USB devices are connected to which port? Is it still working after the assigned device gets unplugged/re-plugged? A: The formal way is to check the board schematics. A simple way is to plug a USB 2.0 or 3.0 devices and use “dmsg” to show the log, or “lsusb -l”.
Q: can we only passthru xDCI? xDCI is 15.01 function and 15.00 is xhci so if you passthru 15.01 only it doesn't work A: Yes, it’s current design. In latest code, it can work 15.00 to SOS while 15.01 assign to UOS.
Q: Did you test the UVC/camera use cases? is there any limitation on data-speed/rate? For example multiple 4K cameras. A: Sorry, we haven’t tested USB camera. We only tried USB headset.
Q: Any suggestion for tools/setup to do the stress test or degradation test? A:
Q: Does USB mediator support USB-Ethernet adapter? A:
· For bulk transfer: Use USB2/USB3 flash drive with iozone.
· For isochronous transfer: Use USB2 headset and USB2/USB3 camera to do the test.
· For control transfer, enumeration: Use https://store.mcci.com/products/mcci-usb-3-0-connection-exerciser
· For interrupt transfer: Use USB keyboard/mouse/touch to do the test.
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