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Re: open sleeps

To: Brian May <brian@xxxxxxxx>
Subject: Re: open sleeps
From: Dave Chinner <david@xxxxxxxxxxxxx>
Date: Thu, 19 Jun 2008 16:21:18 +1000
Cc: xfs@xxxxxxxxxxx
In-reply-to: <4859EE54.6050801@vpac.org>
Mail-followup-to: Brian May <brian@xxxxxxxx>, xfs@xxxxxxxxxxx
References: <4859EE54.6050801@vpac.org>
Sender: xfs-bounce@xxxxxxxxxxx
User-agent: Mutt/1.5.17+20080114 (2008-01-14)
On Thu, Jun 19, 2008 at 03:27:48PM +1000, Brian May wrote:
> Hello,
>
> I am having (weird) issues with XFS, in that open(...) on certain files  
> takes 45 seconds to return. After the file has been opened, the next  
> file in the same directory takes 45 seconds. If the file was recently  
> opened it returns immediately.
>
> I thought this was a low level I/O issue, so copied the files in  
> question to a completely independent RAID array  (separate LVM, RAID,  
> controllers, disks), but the problem remains.
>
> More details at thread starting from  
> <http://lists.luv.asn.au/wws/arc/luv-main/2008-06/msg00143.html>.
>
> Any ideas?

# echo t > /proc/sysrq-trigger

when it is hung to get a stack trace of the blocked open call.

Cheers,

Dave.
-- 
Dave Chinner
david@xxxxxxxxxxxxx


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