On Wed, 18 Jul 2007 09:15:46 -0400 Christopher Fowler <cfowler@xxxxxxxxxxxxxxxxxxx> wrote: > On Tue, 2007-07-17 at 21:59 +0100, Stephen Hemminger wrote: > > > > RT kernel will also change the adapter hard irq into a work queue so > > it will > > actually make the receive latency worse not better. > > Is there any such thing as "Real-Time IP"? I thought the nature of > TCP/IP lead to latency and the any RT type communications need to take > place over something like serial. > > People use UDP/IP for time critical applications. But like any real time system it comes down to what the allowable latency for the application is, and on what systems and topology it is deployed. The RT Linux patch seems to be focused on giving faster response to applications/threads that need servicing. I.e soft real time. The tradeoff is shortening the possible thread service latency of an application real time thread due interrupts from devices. In other words, with RT you can have a real time thread that gets microsecond response even though the normal e1000 irq could spend 10's of microseconds walking the receive ring. - To unsubscribe from this list: send the line "unsubscribe linux-net" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
