> if you can tolerate occasional few-millisecond delays, the plain
> kernel may suffice.
this is much too harsh; with the user-level app running RT, and no stupid
misconfigurations (IDE in PIO, other RT tasks), there won't be "occasional"
long delays.
> a benchmark. If the hardware can support timers, can see everything
> with software; otherwise a storage scope watching stimulus and response
> will do nicely.
why not just rdtsc in the driver, and again in the app?
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