Beat Küng f47d0c8f8c load_mon: reduce FDS_LOW_WARNING_THRESHOLD to 3
This bound can be quite tight, because:
- The system still behaves well, even if all FD's are used (as opposed to
  a stack overflow)
- The amount of used FD's is typically only increased one at a time
  (e.g. adding new logged topics, adding a mavlink stream, ...)
- reducing CONFIG_NFILE_DESCRIPTORS to the minimum frees up a considerable
  amount of RAM on systems that need it
2018-01-12 23:18:59 +01:00
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