Comment 78 for bug 607560

Ubuntu 12.04 LTS. This bug affects me as well. Intevalls are pretty irregular.

~$ sudo iotop -obtqqq | grep jbd2:
23:34:46 270 be/3 root 0.00 B/s 0.00 B/s 0.00 % 3.42 % [jbd2/sda7-8]
23:34:50 953 be/3 root 0.00 B/s 3.88 K/s 0.00 % 4.38 % [jbd2/sda8-8]
23:34:57 270 be/3 root 0.00 B/s 15.50 K/s 0.00 % 2.21 % [jbd2/sda7-8]
23:35:08 270 be/3 root 0.00 B/s 7.75 K/s 0.00 % 3.40 % [jbd2/sda7-8]
23:35:29 270 be/3 root 0.00 B/s 0.00 B/s 0.00 % 1.35 % [jbd2/sda7-8]
23:35:38 270 be/3 root 0.00 B/s 19.37 K/s 0.00 % 2.36 % [jbd2/sda7-8]
23:35:49 270 be/3 root 0.00 B/s 7.75 K/s 0.00 % 3.73 % [jbd2/sda7-8]
23:36:09 270 be/3 root 0.00 B/s 0.00 B/s 0.00 % 1.79 % [jbd2/sda7-8]
23:36:22 270 be/3 root 0.00 B/s 15.50 K/s 0.00 % 1.77 % [jbd2/sda7-8]
23:36:29 270 be/3 root 0.00 B/s 7.75 K/s 0.00 % 3.10 % [jbd2/sda7-8]

~$ mount -l:
/dev/sda7 on / type ext4 (rw,errors=remount-ro)
proc on /proc type proc (rw,noexec,nosuid,nodev)
sysfs on /sys type sysfs (rw,noexec,nosuid,nodev)
none on /sys/fs/fuse/connections type fusectl (rw)
none on /sys/kernel/debug type debugfs (rw)
none on /sys/kernel/security type securityfs (rw)
udev on /dev type devtmpfs (rw,mode=0755)
devpts on /dev/pts type devpts (rw,noexec,nosuid,gid=5,mode=0620)
tmpfs on /run type tmpfs (rw,noexec,nosuid,size=10%,mode=0755)
none on /run/lock type tmpfs (rw,noexec,nosuid,nodev,size=5242880)
none on /run/shm type tmpfs (rw,nosuid,nodev)
/dev/sda4 on /boot type ext4 (rw)
/dev/sda3 on /media/Share type fuseblk (rw,nosuid,nodev,allow_other,default_permissions,blksize=4096) [Shared]
/dev/sda8 on /home type ext4 (rw)
gvfs-fuse-daemon on /home/ari/.gvfs type fuse.gvfs-fuse-daemon (rw,nosuid,nodev,user=ari)

Haven't done any advanced debugging yet.