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

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Message-ID: <bug-86471-13602-uBbQug1eOc@https.bugzilla.kernel.org/>
Date:	Thu, 23 Oct 2014 10:34:39 +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 #5 from Markus Königshaus <m.koenigshaus@....de> ---
Hello Theodore,
I really wait a long time and I have the kernel dropped all Caches with
/proc/sys/vm/drop_caches, so I do not thing, there are left buffered writes
from mysqld. I can reproduce that behavior, before mysql shutdown I get 14
MB/s, after I get 400 kB/s with dd. 
I will try to compile blktrace for our system later, not enough time for that
now. Can blktrace show me how often the writeback - mechanism writes the cache
back to e.mmc - card?

Markus

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