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: Wed, 22 Oct 2014 16:00:51 +0000
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https://bugzilla.kernel.org/show_bug.cgi?id=3D86471
--- Comment #3 from Markus K=C3=B6nigshaus ---
It looks like a problem in the writeback - mechanism, not ext4 related,=
sorry:
cd /sys/kernel/debug/tracing/
echo function > current_tracer
echo writeback* > set_ftrace_filter
>> before mysqlshutdown
# tracer: function
#
# entries-in-buffer/entries-written: 3/3 #P:1
#
# _-----=3D> irqs-off
# / _----=3D> need-resched
# | / _---=3D> hardirq/softirq
# || / _--=3D> preempt-depth
# ||| / delay
# TASK-PID CPU# |||| TIMESTAMP FUNCTION
# | | | |||| | |
dd-3666 [000] ...1 1338.484467: writeback_in_progress
<-balance_dirty_pages_ratelimited
kworker/u2:2-1001 [000] ...2 1338.557118: writeback_sb_inodes
<-__writeback_inodes_wb
kworker/u2:2-1001 [000] ...2 1338.557160: writeback_sb_inodes
<-__writeback_inodes_wb
>> after mysqlshutdown:
# tracer: function
#
# entries-in-buffer/entries-written: 384/384 #P:1
#
# _-----=3D> irqs-off
# / _----=3D> need-resched
# | / _---=3D> hardirq/softirq
# || / _--=3D> preempt-depth
# ||| / delay
# TASK-PID CPU# |||| TIMESTAMP FUNCTION
# | | | |||| | |
dd-3733 [000] ...1 1403.061232: writeback_in_progress
<-balance_dirty_pages_ratelimited
kworker/u2:2-1001 [000] ...2 1403.061277: writeback_sb_inodes
<-__writeback_inodes_wb
dd-3733 [000] ...1 1403.071042: writeback_in_progress
<-balance_dirty_pages_ratelimited
dd-3733 [000] ...1 1403.071328: writeback_in_progress
<-balance_dirty_pages_ratelimited
kworker/u2:2-1001 [000] ...2 1403.071350: writeback_sb_inodes
<-__writeback_inodes_wb
dd-3733 [000] ...1 1403.077546: writeback_in_progress
<-balance_dirty_pages_ratelimited
[ ... repeat 368 times ... ]
dd-3733 [000] ...1 1404.327043: writeback_in_progress
<-balance_dirty_pages_ratelimited
dd-3733 [000] ...1 1404.327306: writeback_in_progress
<-balance_dirty_pages_ratelimited
kworker/u2:2-1001 [000] ...2 1404.327336: writeback_sb_inodes
<-__writeback_inodes_wb
dd-3733 [000] ...1 1404.337125: writeback_in_progress
<-balance_dirty_pages_ratelimited
someone an idea, where to report this problem?
Regards, Markus
--=20
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