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SubjectRe: 2.6.31-rc8: CIFS with 5 seconds hiccups
On Thu, 10 Sep 2009 14:53:12 -0400 (EDT)
Christoph Lameter <cl@linux-foundation.org> wrote:

> On Wed, 9 Sep 2009, Jeff Layton wrote:
>
> > Well, I can see the delays in the capture, but the snarflen for the
> > capture is a little too small to tell much else. Can you redo the
> > capture with a larger snarflen (maybe -s 512 or so)?
>
> -s 1000 version attached.
>
> > Also, were you able to tell anything from a server-side capture? Is the
> > server issuing oplock breaks at those times?
>
> Thats a pretty busy system. They have not gotten around to do any logging
> on that end.

Ok. I had a look at the capture. The stalls seem to be occurring on
FIND_FILE requests. Those are similar to READDIRPLUS requests in NFS,
it returns a list of files that match a particular set of criteria and
their attributes.

Each time the client is making one of these calls to the server, it
requests a set of up to 150 files. The server grinds for 5s each time
and then responds.

The calls themselves seem to be sane AFAICT. I don't see any problems
with the parameters we're sending for the search. I also had a look
over the FIND_FIRST code and it doesn't seem to have any obvious
word size related problems.

I assume that the 32 and 64 bit clients you have are calling "ls" in
the same dir. If so, maybe a similar capture from a 64-bit client might
help us see the difference?

Thanks,
--
Jeff Layton <jlayton@redhat.com>


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