From: "J. Bruce Fields" <bfields@fieldses.org>
Subject: Re: ETIMEDOUT in nfsd?
Date: Thu, 5 Aug 2004 10:21:59 -0400
Sender: nfs-admin@lists.sourceforge.net
Message-ID: <20040805142159.GB25948@fieldses.org>
References: <20040803081503.GM5581@sgi.com> <20040803191610.GC7781@fieldses.org> <20040804073500.GP5581@sgi.com> <20040804141346.GA19282@fieldses.org> <20040805022608.GR5581@sgi.com>
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Cc: Linux NFS Mailing List <nfs@lists.sourceforge.net>
To: Greg Banks <gnb@sgi.com>
In-Reply-To: <20040805022608.GR5581@sgi.com>
Errors-To: nfs-admin@lists.sourceforge.net

On Thu, Aug 05, 2004 at 12:26:08PM +1000, Greg Banks wrote:
> On Wed, Aug 04, 2004 at 10:13:46AM -0400, J. Bruce Fields wrote:
> > So from the point of view
> > of the NFS server code, it does look like a retry, but the NFS client
> > isn't involved--the server rpc code did the retry on its own.
> 
> Aha...I see now.
> 
> > This is only right if upcalls are done before you've done anything
> > non-idempotent, which makes it hard to handle NFSv4 compounds
> > correctly.
> 
> Ouch, this is not a good assumption, especially considering servers
> rebooting and cache timeouts.

I don't see the problem you're referring to.  I don't believe that in
either case these internal replays add any problems that we don't
already have, but perhaps I'm missing something.

> > > Why not send EJUKEBOX to the client, and let it manage retry using a
> > > retry strategy designed for a slow server instead of the one designed
> > > for lossy networks?
> > 
> > That might mean returning EJUKEBOX on a lot of common operations (e.g.
> > on the first rpc request from a new client), when the server usually
> > could have replied very quickly.
> 
> Potentially.  But, in your experience do idmapper upcalls proceed quickly?

It's a good question; it would be interesting to measure them sometime
with a variety of different configurations (local /etc/passwd, ldap,
etc.), but we haven't gotten around to that yet.

--Bruce Fields


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