linux-kernel - Re: 2.6.xx: NFS: directory motion/cam2 contains a readdir loop

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Message-ID: <4E306D09.5030704@netapp.com>
Date:	Wed, 27 Jul 2011 15:54:49 -0400
From:	Bryan Schumaker <bjschuma@...app.com>
To:	Christoph Hellwig <hch@...radead.org>
CC:	Justin Piszcz <jpiszcz@...idpixels.com>,
	"J. Bruce Fields" <bfields@...ldses.org>,
	linux-nfs@...r.kernel.org, linux-kernel@...r.kernel.org,
	xfs@....sgi.com
Subject: Re: 2.6.xx: NFS: directory motion/cam2 contains a readdir loop

On 07/27/2011 03:47 PM, Christoph Hellwig wrote:
> On Wed, Jul 27, 2011 at 03:44:20PM -0400, Justin Piszcz wrote:
>>
>>
>> On Wed, 27 Jul 2011, Christoph Hellwig wrote:
>>
>>> On Wed, Jul 27, 2011 at 03:35:01PM -0400, Justin Piszcz wrote:
>>>> Currently I do not see any dupes, however I have a script that moves
>>>> images out of the directory once an hour:
>>>> 0 * * * * /usr/local/bin/move_to_old2.sh > /dev/null 2>&1
>>>
>>> Do you keep adding files to the directory while you move files out?
>> Yes, otherwise there are too many files in the directory and viewers, e.g.,
>> each geeqie (picture viewer) will use > 4-6GB of memory, so I try to keep
>> it around 5,000 pictures or less.
>>
>>> What's the rate of additions/removals to the directory?
>> Additions it depends, around 5,000 over a 12hr period, 416/hr, current:
>>
>> atom:/d1/motion# find cam1|wc
>>    5215    5215  166853
>> atom:/d1/motion# find cam2|wc
>>    5069    5069  162181
>> atom:/d1/motion# find cam3|wc
>>    5594    5594  178981
>> atom:/d1/motion#
> 
> This sounds a lot like xfs simply filling up the directory index slots
> of files that you just moved out with new files, and nfs falsely
> claiming that this is a problem.
> 
> Any chance to figure out if the file you hit the printk with was one
> that got either recently added or moved when you hit it?  (I can't
> follow the nfs code enough to check if it prints the first or second hit
> of the same cookie)

It should be printing on the second hit of a cookie.

- Bryan

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