Hi,

As painfully found out by mono team, if big/little cores have
different cache line sizes, __clear_cache doesn't work as expected.
This affects any home-grown cache flushing mechanism as well.

http://www.mono-project.com/news/2016/09/12/arm64-icache/

protip, if you suspect your application issues might related to
big.LITTLE, use taskset(1) or hwloc-bind(1) to tie the process to
either big or little cluster (or just a single core).
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