From mboxrd@z Thu Jan 1 00:00:00 1970
From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 86471] drastic reduction of write performance after the
termination of mysqld
Date: Fri, 17 Oct 2014 16:29:29 +0000
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https://bugzilla.kernel.org/show_bug.cgi?id=3D86471
--- Comment #2 from Markus K=C3=B6nigshaus ---
Hi Theodore,
even after a very long wait, the performance remain so low. The perform=
ance is
also low when you copy files. I have used dd, so I create only reproduc=
ible
write access.
I have now tested the ext3 FS, same result.
After some debugging I found out, there is a delay in start_this_handle=
(look
at the timing), with echo 5 > /sys/kernel/debug/jbd/jbd-debug I get:
>> before mysqlshutdown:
=2E..
[ 40.400755] fs/jbd/transaction.c: (journal_stop, 1380): h_ref 2 -> 1
[ 40.400755]=20
[ 40.400765] fs/jbd/transaction.c: (journal_stop, 1384): Handle df03e=
000
going down
[ 40.400765]=20
[ 40.400789] fs/jbd/transaction.c: (journal_start, 290): from journal=
_start
[ 40.400789]=20
[ 40.400801] fs/jbd/transaction.c: (start_this_handle, 110): New hand=
le
df03e000 going live.
[ 40.400801]=20
[ 40.400813] fs/jbd/transaction.c: (start_this_handle, 229): Handle d=
f03e000
given 14 credits (total 21, free 14286)
=2E..
>> after mysqlshutdown:
=2E..
[ 61.383886] fs/jbd/transaction.c: (journal_stop, 1380): h_ref 2 -> 1
[ 61.383886]=20
[ 61.383896] fs/jbd/transaction.c: (journal_stop, 1384): Handle df03e=
000
going down
[ 61.383896]=20
[ 61.393528] fs/jbd/transaction.c: (start_this_handle, 110): New hand=
le
df03e000 going live.
[ 61.393528]=20
[ 61.393541] fs/jbd/transaction.c: (start_this_handle, 229): Handle d=
f03e000
given 14 credits (total 21, free 14271)
=2E..
I try to isolate the problem in more detail next week, I would welcome =
tips and
help for my try.
Regards, Markus
--=20
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