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--- Begin Message ---> On 8 May 2018, at 21:11, Rosen Penev <[email protected]> wrote: > >> >> So out of curiosity I built this for my Archer C7 v2 ar71xx device. I also >> modified the code to not give up on ‘OK’, so it always iterated 10 times. I >> then ran this repeatedly using ‘watch’. Observations: >> >> 1) Failure only occurred on 1st check, it never appeared/re-appeared on >> subsequent passes. >> 2) Failure offsets are always at 32 byte intervals. That corresponds nicely >> with cache-line size. > Yeah the L1 >> >> Grabbing at straws to some extent. So I modified the user space code a little more, namely moving the usleep to before the check (obviously still after the mmap) - I am yet to see an error. printf("mmap addr: %p\n", addr); data = addr; for (i = 0; i < 10; i++) { usleep(500000); check_data(data, page_size); } So that smells more of a race condition between the writer filling with 0xFF and the reader catching up. Again, assume that I am an idiot and am missing something fundamental.
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