Hi, when running our cameras on USB3.0 ports we get "ERROR no room on ep ring". This only happens if camera's image size is bigger than ~1MB or when using multiple image buffers (queueing). Capturing is made through libusb and async bulk transfers. Now, as more and more of our customers are using PCIe-USB3.0 extension cards we get under pressure. After looking into xhci driver sources, i have seen that TRBS_PER_SEGMENT is limited to 64 and segments per ep ring is fixed to 1. (right?) Playing with this params (TRBS_PER_SEGMENT=256 and ep ring segments=8) and first tests led to good results. So, my question is, do you agree with me that limited ep ring allocation might cause above mentioned error. Is there a chance to push development on ep ring allocation? Thank you in advance. Kruno Mrak MATRIX VISION GmbH, Talstrasse 16, DE-71570 Oppenweiler Registergericht: Amtsgericht Stuttgart, HRB 271090 Geschaeftsfuehrer: Gerhard Thullner, Werner Armingeon, Uwe Furtner, Erhard Meier -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
