Re: [libusb] External: - Re: Question - "libusb: error [winusbx_set_interface_altsetting] SetCurrentAlternateSetting failed: Insufficient system resources exist to complete the requested service."

[Fourcade, P. <Pie...@sm...>]

Our device is the only one demanding on the USB bus, so nothing else should be using more than 100 MB/s.
The issue occurred on various computers with different USB ports and controllers. However, I can check if there’s another USB controller on the computer that’s currently failing. If it works on that one, I could assume the issue is with the controller. Do you know if there’s a way, either through libusb or Windows, to access the available resources of the USB bus? This would allow me to see if there’s indeed an inability to lock our 300 MB/s.

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Well, mostly.  You're asking for 300 MB/s.  The total bus capacity after encoding is about 500 MB/s, but only 80% of that bandwidth is allowed to be allocated to reservations for interrupt and isochronous pipes.  Mice and keyboards also have reservations, although USB 2 traffic travels on different wires from USB 3 traffic.


It could just be a host controller failure.  Do these errors happen on the same types of computers?

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Tim Roberts, ti...@pr...<mailto:ti...@pr...>
Providenza & Boekelheide, Inc.