Hi Florian, Do you know how to duplicate your issue again? It could help to spot issues in the building system.
Did you press Ctrl + C during the compilation at any moment? Did you face some C file error that interrupted the compilation abruptly? If you duplicate it please let us know. BR, Alan On Saturday, January 25, 2020, Florian Wehmeyer <flo...@gmx.net> wrote: > > Just saw that I had responded to Gregs mail individually. > > Sending to the list just to finish the topic.. > > Best, > > Florian > > > On 24/01/2020 22:07, Florian Wehmeyer wrote: >> >> Hi Greg, >> >> thanks for the ultra-fast reply!! >> >> Turns out the problem of system panic after increasing >> CONFIG_NFILE_DESCRIPTORS was due to inconsistent compile, some of the >> file descriptor structures might not have been compiled with correct >> sizes. >> >> When running a make clean before compiling everything works great. >> >> I guess a "make clean" should be default practice after changing >> anything in the config. >> >> >> >> CONFIG_STDIO_BUFFER_SIZE for those devices is already 0 because of >> >> CONFIG_STDIO_DISABLE_BUFFERING=y >> >> >> Best, >> >> Florian >> >> >> >> >> On 24/01/2020 18:24, Gregory Nutt wrote: >>> >>>> 1) am I doing bad practice, opening that much file descriptors per >>>> task? >>>> if yes, I could open and close them on each access, which is actually >>>> each 100ms, if that would be less overhead (guess not). >>> >>> No, it is perfectly fine to change the number of descriptors, >>> provided that you have at least 3. >>>> >>>> 2)Of course I tried to set CONFIG_NFILE_DESCRIPTORS=8, but when I do >>>> that, >>>> the system jumps into arch/arm/src/armv6-m/up_assert.c :_up_assert(), >>>> before even finishing >>>> nx_start(). >>>> Is there anything else that must be considered when increasing the >>>> CONFIG_NFILE_DESCRIPTORS? >>> >>> No, other than it will greatly increase memory usage. That is a big >>> deal on that platform. >>> >>> Check CONFIG_STDIO_BUFFER_SIZE, the increased memory usage will go >>> into (1) file descriptor structures, and (2) buffers for C-buffered >>> I/O. You can set CONFIG_STDIO_BUFFER_SIZE as low as zero, but then >>> you will have no buffering that that will affect realtime preformance. >>> >>> Greg >>> >>> > -- > Florian Wehmeyer > TFW Tech Solutions > >
