linux-ext4 - [Bug 39072] New: jbd2 writes on disk every few seconds

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Date:	Sat, 9 Jul 2011 15:12:48 GMT
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 39072] New: jbd2 writes on disk every few seconds

https://bugzilla.kernel.org/show_bug.cgi?id=39072

           Summary: jbd2 writes on disk every few seconds
           Product: File System
           Version: 2.5
    Kernel Version: 2.6.39.2 arch
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: ext4
        AssignedTo: fs_ext4@...nel-bugs.osdl.org
        ReportedBy: marcin2006@...il.com
        Regression: Yes

If I don't specify in /etc/fstab some large commit value, jbd2 is killing my
disk, I think even more frequently than default 5 seconds. Mount says:
/dev/sda6 on / type ext4 (rw,noatime,user_xattr,acl,barrier=1,data=ordered)
In iotop jbd2 constantly appears on top and sysctl vm.block_dump=1, dmesg |
grep -e READ -e WRITE shows that jdb2 is writting on the disk every few seconds
and only jdb2. I have IBM ThinkPad x30 here, but simmilar thing happens on my
PC. I guess it should not write to disk if there isn't really anything to
write. It is impossible to spin-down the HDD.

I have a minimal archlinux system here with xfce, running from failsafe entry
from GRUB, while pursuing this problem I have killed X, killed all daemons,
swapoff, unloaded acpi modules, usb modules and other - nothing helps.

I'm not even sure what logs should I attach as people are complaining on
different configurations for a year, it's all there:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/607560
https://bbs.archlinux.org/viewtopic.php?id=113516&p=1

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