[Bug 86471] drastic reduction of write performance after the termination of mysqld

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=86471

--- Comment #4 from Theodore Tso <tytso@mit.edu> ---
Are you sure this is actually a problem?    Could it just be that when mysqld
shuts down, it's issuing a huge number of buffered writes which is just taking
a long, long time to get written out to your eMMC device (which is typically
very, *very* slow to handle writes).

I had suggested using blktrace to see if I/O is going on.   You could also try
looking using iostat or the dstat program.   If it's just that I/O is still
happening, then things may be working normally --- just that eMMC might be a
bad match with a high performance database workload.

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