On Sat, Mar 25, 2023 at 10:00:24PM +0300, Sergey Organov wrote: > In correctly working RT system this doesn't typically happen, as CPUs > are way faster than typical UART speeds, and are able to handle the > loads easily, provided UART has decent FIFO. It's disabling IRQs for > prolonged times that makes shit happen. The first time we were looking into this issue was before 7a637784d517 and with a PREEMPT-RT patched kernel (if I remember correctly it was a v5.4). The system was not loaded at all and it was pretty surprising the behavior, because of the reasons you just wrote here. Francesco
