Timeline for Why are old CPUs like MOS Technology 6502 and Motorola 68000 considered better for real time systems applications than modern x86 based CPUs?
Current License: CC BY-SA 4.0
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| Oct 17, 2020 at 14:41 | comment | added | Peter Cordes |
Getting exactly-known execution time on modern x86 (to avoid timing jitter as @Brian H commented) could means burning a lot of those very short clock cycles checking an accurate timesource to make the normal case run at the same speed as the worst case for cache misses, branch mispredicts, or whatever. e.g. this rdtsc deadline spin loop (under a non-Linux OS, or on an isolated core).
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| Oct 16, 2020 at 18:26 | history | answered | RETRAC | CC BY-SA 4.0 |