From: Jan Kara <jack@suse.cz>
To: Simon Mcnair <simonmcnair@gmail.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: kernel Unaligned AIO/DIO on inode EXT4-fs Unaligned AIO/DIO on inode by VirtualBox; performance will be poor.
Date: Fri, 23 Dec 2011 14:00:08 +0100 [thread overview]
Message-ID: <20111223130008.GA29095@quack.suse.cz> (raw)
In-Reply-To: <CAKaSfQB5t4+k2XPpVJzox3mRNAhUi8kdCxeEYk83BJG+kpbj_g@mail.gmail.com>
Hello,
On Fri 23-12-11 09:42:08, Simon Mcnair wrote:
> 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.
...
>
> 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@simon-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 ?
Well, kernel complains that VirtualBox is doing unaligned AIO/DIO.
I suppose that it's caused by the fact that the filesystem in Win7.vmdk
image has block size smaller than 4 KB but I'm not really sure how
VirtualBox does IO. You should talk to VirtualBox guys whether you could
tune your installation somehow so that VirtualBox works more efficiently.
Honza
next prev parent reply other threads:[~2011-12-23 13:00 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-23 9:42 Simon Mcnair
2011-12-23 13:00 ` Jan Kara [this message]
2011-12-23 18:23 ` Simon McNair
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