From: bugzilla-daemon@bugzilla.kernel.org
To: linux-ext4@vger.kernel.org
Subject: [Bug 86471] drastic reduction of write performance after the termination of mysqld
Date: Thu, 23 Oct 2014 16:36:01 +0000 [thread overview]
Message-ID: <bug-86471-13602-ApLc0iLpJM@https.bugzilla.kernel.org/> (raw)
In-Reply-To: <bug-86471-13602@https.bugzilla.kernel.org/>
https://bugzilla.kernel.org/show_bug.cgi?id=86471
--- Comment #6 from Markus Königshaus <m.koenigshaus@wut.de> ---
I think I have found the error. The kernel calls apparently for the same page
dec_zone_page_state on (page, NR_FILE_DIRTY) twice, which means that the dirty
page counter underflows (is getting negative):
cat /proc/meminfo
MemTotal: 511492 kB
MemFree: 406972 kB
MemAvailable: 450536 kB
Buffers: 1840 kB
Cached: 52140 kB
SwapCached: 0 kB
Active: 54348 kB
Inactive: 34456 kB
Active(anon): 34904 kB
Inactive(anon): 5440 kB
Active(file): 19444 kB
Inactive(file): 29016 kB
Unevictable: 0 kB
Mlocked: 0 kB
HighTotal: 0 kB
HighFree: 0 kB
LowTotal: 511492 kB
LowFree: 406972 kB
SwapTotal: 0 kB
SwapFree: 0 kB
>> Dirty: 4294967148 kB
Writeback: 0 kB
AnonPages: 34844 kB
Mapped: 13992 kB
Shmem: 5520 kB
Slab: 9196 kB
SReclaimable: 4976 kB
SUnreclaim: 4220 kB
KernelStack: 696 kB
PageTables: 1024 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
WritebackTmp: 0 kB
CommitLimit: 255744 kB
Committed_AS: 365452 kB
VmallocTotal: 499712 kB
VmallocUsed: 3512 kB
VmallocChunk: 495964 kB
The writeback - mechanism thinks that too much pages are dirty and disables the
writeback - cache.
Who can I send this bug?
Markus
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next prev parent reply other threads:[~2014-10-23 16:36 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-17 13:14 [Bug 86471] New: drastic reduction of write performance after the termination of mysqld bugzilla-daemon
2014-10-17 16:10 ` [Bug 86471] " bugzilla-daemon
2014-10-17 16:29 ` bugzilla-daemon
2014-10-22 16:00 ` bugzilla-daemon
2014-10-22 20:22 ` bugzilla-daemon
2014-10-23 10:34 ` bugzilla-daemon
2014-10-23 16:36 ` bugzilla-daemon [this message]
2014-10-24 15:14 ` bugzilla-daemon
2014-10-24 15:34 ` bugzilla-daemon
2014-11-13 14:24 ` bugzilla-daemon
2014-11-13 14:33 ` bugzilla-daemon
2014-11-13 14:41 ` bugzilla-daemon
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