2008-08-31 19:46:20

by J. Bruce Fields

[permalink] [raw]
Subject: Re: NFS regression? Odd delays and lockups accessing an NFS export.

On Sun, Aug 31, 2008 at 08:44:02PM +0100, Ian Campbell wrote:
> On Sun, 2008-08-31 at 15:30 -0400, J. Bruce Fields wrote:
> > On Sat, Aug 30, 2008 at 04:47:41PM +0100, Ian Campbell wrote:
> > > On Wed, 2008-08-27 at 09:43 -0500, Tom Tucker wrote:
> > > > Sure. I've actually tried to reproduce it here unsuccessfully.
> > > >
> > > > As a starter, I would suggest turning on transport debugging:
> > > >
> > > > # echo 256 > /proc/sys/sunrpc/rpc_debug
> > > > [...]
> > > > If Ian is willing to create the log (or already has one), I'm
> > > > certainly willing to look at it.
> > >
> > > It produced only the following (is that what was expected?):
> > >
> > > [146866.448112] -pid- proc flgs status -client- -prog- --rqstp- -timeout -rpcwait -action- ---ops--
> > > [146866.448112] 30576 0001 00a0 0 f77a1600 100003 f7903340 15000 xprt_pending fa0ba88e fa0c9df4
> > > [146866.448112] 30577 0004 0080 -11 f77a1600 100003 f7903000 0 xprt_sending fa0ba88e fa0c9df4
> >
> > It's normal to get something like that when you turn it on, yes (unless
> > someone else spots anything odd about that...) but what's really needed
> > is to turn this on and then reproduce the problem--it's the debugging
> > output that goes to the logs during the problem that'll be interesting.
>
> That's what I did. The first time I did the echo I just got the header
> line, then I waited for the repro and since there had been no further
> logging I ran the echo again and got the three lines above.
>
> Sounds like you expected there to be more and ongoing logging?

Yes. It's the server side we're interested in, by the way--are you
collecting this deubgging on the client?

--b.


2008-08-31 19:50:12

by Ian Campbell

[permalink] [raw]
Subject: Re: NFS regression? Odd delays and lockups accessing an NFS export.

On Sun, 2008-08-31 at 15:46 -0400, J. Bruce Fields wrote:
> Yes. It's the server side we're interested in, by the way--are you
> collecting this deubgging on the client?

Er, yeah, since the client appeared to be the problem.

I'll try again on the server!

Ian.
--
Ian Campbell

The descent to Hades is the same from every place.
-- Anaxagoras


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2008-08-31 19:51:55

by Tom Tucker

[permalink] [raw]
Subject: Re: NFS regression? Odd delays and lockups accessing an NFS export.

Ian Campbell wrote:
> On Sun, 2008-08-31 at 15:46 -0400, J. Bruce Fields wrote:
>> Yes. It's the server side we're interested in, by the way--are you
>> collecting this deubgging on the client?
>
> Er, yeah, since the client appeared to be the problem.
>
> I'll try again on the server!
>

Thanks Ian,

Tom

> Ian.


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