netdev - Re: STMMAC driver: NFS Problem on 2.6.37

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Date:	Wed, 9 Feb 2011 20:58:55 +0000
From:	Brian Downing <bdowning@...os.net>
To:	Chuck Lever <chuck.lever@...cle.com>
Cc:	deepaksi <deepak.sikri@...com>,
	Armando VISCONTI <armando.visconti@...com>,
	Trond Myklebust <Trond.Myklebust@...app.com>,
	netdev@...r.kernel.org,
	Linux NFS Mailing List <linux-nfs@...r.kernel.org>,
	Shiraz HASHIM <shiraz.hashim@...com>,
	Viresh KUMAR <viresh.kumar@...com>,
	Peppe CAVALLARO <peppe.cavallaro@...com>,
	amitgoel <amit.goel@...com>
Subject: Re: STMMAC driver: NFS Problem on 2.6.37

On Wed, Feb 09, 2011 at 03:12:22PM -0500, Chuck Lever wrote:
> Based on your console logs, I see that the working case uses UDP to
> contact the server's mountd, but the failing case uses TCP.  You can
> try explicitly specifying "proto=udp" to force the use of UDP, to test
> this theory.

This does indeed make it work again for me, thanks!

> Meanwhile, the patch description explicitly states that the default
> mount option settings have changed.  Does it make sense to change the
> default behavior of NFSROOT mounts to use UDP again?  I don't see
> another way to make this process more reliable across NIC
> initialization.  If this is considered a regression, we can make a
> patch for 2.6.38-rc and 2.6.37.

I only use nfsroot for development, so I don't have a terribly strong
opinion.  I would point out though that the default u-boot parameters
for nfsrooting a lot of boards will no longer work at this point, so if
it's not patched to work again without specifying nfs options I think
there should at least be a note in the documentation and possibly a
"maybe try proto=udp?" console message on failure.

I assume it's not feasable to either wait until the chosen interface's
link is ready before trying to mount nfsroot, or retrying TCP-based
connections a little bit more aggressively/at all?

-bcd
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