Roland Tollenaar wrote: > Hi > > >> What does this mean? This is as good as it gets? > > > > Hm. To be more verbose on what happens between the beginning of > > rtcan_sja_interrupt and rtcan_rcv please remove the "inline" from the > > functions rtcan_sja_err_interrupt in the file > > ksrc/drivers/can/sja1000/rtcan_sja1000.c line 156 and from the function > > rtcan_sja_rx_interrupt in the same file in line 87. Compile your > > modules/kernel again and repeat the tracer/latency test. > > > > I assume that most of the time is spent in the latter function where > > several SJA HW regs are read out. A slow access to the regs could be the > > explanation for the long time the interrupt handler has to spend. > > Where are the registers located? On the dongle or are these in the PC?
These are registers located in the SJA1000 CAN controller. > Just to know whether there might not be a problem with the PEAK device. > Is there any way you could check what the access times are to > rtcan_sja_interrupt on your systems when performing the same experiment > and recieving messages (pref PDO with length 8) over the bus? Unfortunately, I do not have the opportunity to perform tests with the driver ATM. > > I am developing on a pretty high-end machine here, Didn't you speak of 486's in a previous mail? > in fact every aspect > almost as fast as is on the market at the moment so its would surprise > me if there is a hardware shortcoming if the registers you speak of are > on the PC. > > In the mean time I will try doing as you suggest, I presume you want me > to send the frozen trace to you again after that. Exactly. > Is it worth while removing the virtual driver from the kernel build and > running over rtcan0. Turn it off although it is unlikely that it has something to do with the problem. But you never know. > Is there any chance that you have never encountered > this problem I never worked with the virtual device. -- Sebastian _______________________________________________ Xenomai-help mailing list [email protected] https://mail.gna.org/listinfo/xenomai-help
