Hi all, I have an application which is (so far) running using Xenomai and Rtnet. I am about to evaluate this using the rt_preemption patch (V2.6.29.1-rt9). It works quite smoothly, however I have some questions on the priorities that are used for Ethernet, UDP/IP based network communication. I have one separate NIC in my (Intel QuadCore) PC, that is used for a point-to-point connection with an embedded device. Communication is done via UDP. I have now a user thread (RT prio: 80) to do some computation and also the communication with the embedded device. This thread is the only running on core 3. My questions are now: A call of send() in my user space application to transmit a UDP message ends up in the network stack of Linux. Which real time priority will be used in the network stack? Is it the priority of the user space thread that is calling send()? Or is it the priority of the kernel thread [sirq-net-tx/3]? On the receive side (calling recv()): Which threads are relevant here? IRQ-XX for the NIC's irq thread, [sirq-net-rx/3] or also the user space thread that is calling recv()? Thanks for all feedback on that basic question! Best regards Mathias -- Mathias Koehrer mathias_koehrer@xxxxxxxx Arcor.de Gaming Area - kostenfrei daddeln bis der Arzt kommt! Jetzt checken und aus über 80 Spielen wählen! http://www.arcor.de/footer-gaming/ -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
