On Sun, Apr 13, 2008 at 07:37:47PM +0200, Wolfgang Grandegger wrote: > Mauricio � wrote: > > In summary, i am reading from other computer the data sent by a serial > > port, and almost always I have a 30-40 usec jitter, but sometimes > > I get a single point where the jitter is like 1-5 msec. The strange > > thing is that the sender shows perfect timing (less that 30 usec), > > but the reader get these strange jumps. I am downloading the last > > kernel to check the serial port driver code: the patch -rt do something > > with the serial port? or generally some hardware related pacth? > > Just to be sure, the interrupt thread of your serial port is running at > a higher priority than the others. > Yes, the priority is 80 and a FIFO scheduler, the other threads have 70. In QNX it works as it should. I will try the writer in linux, and the reader in QNX to check what is happenig. -- Mauricio Araya L. ACS-UTFSM Team Leader, cel: 0-81564903 Est. Magister en Ciencias de la Informatica UTFSM, Valparaiso, Chile counter.li.org: #249395, http://www.inf.utfsm.cl/~maray -- 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
