Alan Stern wrote: > Why do you want to? Why does changing the endpoint type from interrupt > to bulk improve performance? Yes, the description says that this > causes CPU usage to go from 10% to below 1%, but _why_ does it do that? > > Maybe the same effect can be achieved simply by changing the interrupt > interval instead. Well, when the device is plugged in, the USB core recognizes the endpoints as interrupt type. Later, in the probe() callback, the FW is uploaded to the target and it patches the endpoints' type to bulk. Please correct me if am wrong, but I think this mismatch between the host and the target would be the cause for the high CPU usage, when the transmission load for that endpoint is high. Sujith -- 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
