Hi all, I have an performance issue with socketcan and an MPC5200B. My setup looks like this: - MPC5200B board (TQM5200) - custom base board with two PCA82C251, one for each can controller - linux-2.6.27.18-denx, I use the mpc52xx driver - booted with uboot and kernel from flash - mount root filesystem via NFS - can0 with 1Mbit/s - candump -l can0 to tmpfs
Now I play with the busload on can0 (generated by CANalyzer and three CANcaseXL). This leads to the following results: - 0% to 71% busload -> no missing frames - 74% busload -> 5% missing frames - 77% busload -> 10% missing frames - 90% busload -> 45% missing frames The missing frames are measured by comparison of the candump log file against the CANalyzer log file. The indicated busload is measured by CANalyzer. The cause seems to be very simple: the cpu load is too high (or the cpu is too slow). When the busload is under 71%, the cpu load is under 100%. When the busload goes higher than 71%, the cpu load is 100%. This seems to be the cause for the missing frames. Has anyone else ever seen such an performance issue? Does someone use the MPC5200B in high busload environments? Maybe I configured something wrong in my linux. What about lincan? It has an character device approach with very little overhead. Is there an chance, that this will solve my problem? Best regards, René _______________________________________________ Socketcan-users mailing list [email protected] https://lists.berlios.de/mailman/listinfo/socketcan-users
