[Bugme-new] [Bug 40842] New: Btrfs performance degrades over time

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=40842

           Summary: Btrfs performance degrades over time
           Product: File System
           Version: 2.5
    Kernel Version: 3.0.0
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: btrfs
        AssignedTo: fs_btrfs at kernel-bugs.osdl.org
        ReportedBy: lukas.karas at centrum.cz
        Regression: No


I've dualcore x86_64 server with newest Ubuntu kernel 3.0.0-7-server. On this
server is data storage builded from four (1.5T) discs in two raid1 arrays and
joined with LVM to 3TB volume. This volume is formated with Btrfs a mounted
with default options (rw,noatime). 

On server running corporate NFS and Samba server with same load every day.
Everything works fine after reboot, but several days after server load (iowait
cpu time) goes to high values and server performance is terrible. IOwait stays
high at night too, when nobody works with this server. This situation is
visible on munin graphs in attachments.

After unmount and mount this storage again manually everything goes to normal
for some next days.

What I can try?

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