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> On 8 May 2018, at 21:11, Rosen Penev <ros...@gmail.com> 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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