3 ms·
>I'm working on AMD Epyc 7301 with QNX (real-time OS) and have SMI interruptions on all CPUs every 32 ms for ~400 us. This is not what we wanted to see in real-
by peter_d_sherman 4y ago
>I'm working on AMD Epyc 7301 with QNX (real-time OS) and have SMI interruptions on all CPUs every 32 ms for ~400 us. This is not what we wanted to see in real-time OS.
This is interesting from an OS designer's perspective -- one would probably never see the latency overhead introduced by SMI interrupts on modern CPU's in most popular OS'es -- unless one was working with a real-time OS, like QNX (one that had to make hard, deterministic time guarantees with microsecond accuracy) -- or one was designing a similar real-time OS...