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Peter Stuge peter at stuge.seHarald Welte wrote: > > 2. when using a usb hub, having a lot of USB traffic, or poor USB > > signal quality (I don't know exactly), bulk read timeouts can > > occur in host program simtrace/at91sam7/host/main.c line 230: > > rc = usb_bulk_read(udev, SIMTRACE_IN_EP, buf, sizeof(buf), 100000); > > ok, interesting. I think its not really something we need to care > about, if it works reliably using good cables/hubs. The issue is probably with the fact that bulk transfers are used for the data. Bulk transfers have no bound latency, they will be delivered "as soon as possible" but this can very well mean indefinite delay on a loaded bus. Interrupt transfers and isochronous transfer both have guaranteed bus time, the latter are lossy (think UDP) so I'd suggest using interrupt transfer if there's a choice. Programmatically they work very much like bulk so switching over should be simple. Oh, and in host programs please don't use the old libusb-0.1 API with usb_ functions as it has been deprecated and unmaintained for years, please start using the libusb-1.0 API with libusb_ functions instead; it fixes bugs, has better performance and is actually being worked on. :) //Peter