linux-ext4 - [Bug 36722] New: TRIM support is broken for Crucial M4 drives

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Date:	Sun, 5 Jun 2011 15:05:38 GMT
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 36722] New: TRIM support is broken for Crucial M4 drives

https://bugzilla.kernel.org/show_bug.cgi?id=36722

           Summary: TRIM support is broken for Crucial M4 drives
           Product: File System
           Version: 2.5
    Kernel Version: 2.6.38.8
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: ext4
        AssignedTo: fs_ext4@...nel-bugs.osdl.org
        ReportedBy: kernel-bugs.dev1world@...mgourmet.com
        Regression: No


Created an attachment (id=60842)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=60842)
dmesg output

The TRIM is disabled as per the following messages:

# dmesg | grep "discard not"
[   18.614000] EXT4-fs warning (device sdi8): release_blocks_on_commit:2674:
discard not supported, disabling
[42486.763000] EXT4-fs warning (device sdi11): release_blocks_on_commit:2674:
discard not supported, disabling

but TRIM support is there:

# hdparm -I /dev/sdi | grep TRIM
           *    Data Set Management TRIM supported (limit 8 blocks)
           *    Deterministic read data after TRIM

The drive is on this controller and not part of any RAID:

# lspci | grep LSI

04:00.0 Serial Attached SCSI controller: LSI Logic / Symbios Logic SAS2008
PCI-Express Fusion-MPT SAS-2 [Falcon] (rev 03)

The dmesg is attached.

Can someone also say what this message means:

[42087.056000] EXT4-fs (sdi11): Unaligned AIO/DIO on inode 654340 by
VirtualBox; performance will be poor.

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