* 20 wakeups/second/mounted filesystem in xfsaild
@ 2012-03-10 22:44 Dhivael i-Khial t'Jahlei
2012-03-12 0:59 ` Dave Chinner
0 siblings, 1 reply; 2+ messages in thread
From: Dhivael i-Khial t'Jahlei @ 2012-03-10 22:44 UTC (permalink / raw)
To: xfs
Hello,
i recently switched from ext4 to XFS on some systems. Much to my
surprise, XFS produces quite a lot of wakeups in kernel 3.2.9.
On every mounted filesystem, the associated xfsaild will wake up 20
times per second, when the filesystem is sufficiently loaded, it will
never wake up. The filesystems are mounted with defaults, I'm seeing the
problem on virtual IDE drives in virtual machines and SSD < dmcrypt <
LVM < XFS stacks.
Am I doing something wrong, or am I seeing expected behaviour in XFS?
-- Sean
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* Re: 20 wakeups/second/mounted filesystem in xfsaild
2012-03-10 22:44 20 wakeups/second/mounted filesystem in xfsaild Dhivael i-Khial t'Jahlei
@ 2012-03-12 0:59 ` Dave Chinner
0 siblings, 0 replies; 2+ messages in thread
From: Dave Chinner @ 2012-03-12 0:59 UTC (permalink / raw)
To: Dhivael i-Khial t'Jahlei; +Cc: xfs
On Sat, Mar 10, 2012 at 11:44:03PM +0100, Dhivael i-Khial t'Jahlei wrote:
> Hello,
>
> i recently switched from ext4 to XFS on some systems. Much to my
> surprise, XFS produces quite a lot of wakeups in kernel 3.2.9.
>
> On every mounted filesystem, the associated xfsaild will wake up 20
> times per second, when the filesystem is sufficiently loaded, it will
> never wake up. The filesystems are mounted with defaults, I'm seeing the
> problem on virtual IDE drives in virtual machines and SSD < dmcrypt <
> LVM < XFS stacks.
>
> Am I doing something wrong, or am I seeing expected behaviour in XFS?
Currently expected behaviour - there was a recent bug fix for a
nasty, hard to hit corner case that reintroduced this periodic
wakeup. We're waiting for things to settle down before (i.e. give
users some time to report whether the problem really is fixed before
removing the periodic wakeup again....
Cheers,
Dave.
--
Dave Chinner
david@fromorbit.com
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2012-03-10 22:44 20 wakeups/second/mounted filesystem in xfsaild Dhivael i-Khial t'Jahlei
2012-03-12 0:59 ` Dave Chinner
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