anchao commented on PR #15139:
URL: https://github.com/apache/nuttx/pull/15139#issuecomment-2537502111

   I have made similar changes before, but the problems are:
   1. system tick will not start from 0, which will affect programs that need 
to use CLOCK_MONOTONIC
   2. The acquisition of ticks will consume more CPU cycles (g_system_ticks -> 
up_timer_gettime and clock_ticks2time)
   3. g_system_ticks may no need any more and which will to be removed in most 
scenarios


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