linux-kernel - kernel Unaligned AIO/DIO on inode EXT4-fs Unaligned AIO/DIO on inode by VirtualBox; performance will be poor.

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Message-ID: <CAKaSfQB5t4+k2XPpVJzox3mRNAhUi8kdCxeEYk83BJG+kpbj_g@mail.gmail.com>
Date:	Fri, 23 Dec 2011 09:42:08 +0000
From:	Simon Mcnair <simonmcnair@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: kernel Unaligned AIO/DIO on inode EXT4-fs Unaligned AIO/DIO on inode
 by VirtualBox; performance will be poor.

Hi all,
Sorry for the Newb question but I can't find much clarification of
what this means via google search.  Having seen that it's a generic
kernel error message which just happens to be caused by Virtualbox, I
do not think that Virtualbox is the culprit ?

Dec 20 09:27:24 simon-Vostro1510 kernel: [  345.592265] EXT4-fs
(sda5): Unaligned AIO/DIO on inode 3408273 by VirtualBox; performance
will be poor.
Dec 20 15:27:24 simon-Vostro1510 kernel: [21945.601069] EXT4-fs
(sda5): Unaligned AIO/DIO on inode 3408273 by VirtualBox; performance
will be poor.
Dec 21 07:58:48 simon-Vostro1510 kernel: [75161.962664] EXT4-fs
(sda5): Unaligned AIO/DIO on inode 3408273 by VirtualBox; performance
will be poor.
Dec 21 13:58:48 simon-Vostro1510 kernel: [96762.223676] EXT4-fs
(sda5): Unaligned AIO/DIO on inode 3408273 by VirtualBox; performance
will be poor.
Dec 22 11:25:52 simon-Vostro1510 kernel: [173988.954615] EXT4-fs
(sda5): Unaligned AIO/DIO on inode 3408273 by VirtualBox; performance
will be poor.
Dec 22 11:25:52 simon-Vostro1510 kernel: [173988.954615] EXT4-fs
(sda5): Unaligned AIO/DIO on inode 3408273 by VirtualBox; performance
will be poor.
Dec 21 13:58:48 simon-Vostro1510 kernel: [96762.223676] EXT4-fs
(sda5): Unaligned AIO/DIO on inode 3408273 by VirtualBox; performance
will be poor.

root@...on-Vostro1510:/var/log# parted /dev/sda align-check opt 5
5 aligned

Linux simon-Vostro1510 3.0.0-14-generic #23-Ubuntu SMP Mon Nov 21
20:28:43 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux

root@...on-Vostro1510:/home/simon/VirtualBox VMs/Win7 64bit# ls -lah
-rw------- 1 simon simon 116G 2011-12-22 20:12 Win7.vmdk

Anything I can do to stop this message ?, a change in virtual disk
file from vmdk to VDI or ...something ?

regards
Simon McNair
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