linux-ext4 - [Bug 86471] drastic reduction of write performance after the termination of mysqld

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Message-ID: <bug-86471-13602-rB1bknwNLA@https.bugzilla.kernel.org/>
Date:	Wed, 22 Oct 2014 20:22:55 +0000
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 86471] drastic reduction of write performance after the
 termination of mysqld

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

--- Comment #4 from Theodore Tso <tytso@....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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