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

[Justin Piszcz]

On Wed, 27 Jul 2011, Trond Myklebust wrote:

> On Wed, 2011-07-27 at 16:54 -0400, Trond Myklebust wrote:
> > On Wed, 2011-07-27 at 16:37 -0400, Trond Myklebust wrote:
> > > On Wed, 2011-07-27 at 15:47 -0400, 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.
> > >
> > > Yep. There is an existing bugzilla report for this bug at
> > >
> > >    https://bugzilla.kernel.org/show_bug.cgi?id=38572
> > >
> > > I have a preliminary patch there that attempts to turn off the loop
> > > detection when the directory is seen to change, however that patch still
> > > appears to have a bug in it, and I haven't had time to figure out what
> > > is wrong yet.
> > >
> > > Can you perhaps take a look, Bryan?
> >
> > Actually, Justin, can you test the following slight variant on the patch
> > in the bugzilla?
>
> Doh! This one will actually compile....

Hi,

Should I try 3.0 first or retry 2.6.38 w/ this patch?

Justin.

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