linux-kernel - Re: [bisect] kernel 2.6.38 regression with root nfs mounting

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Message-ID: <20110329212210.GB30482@opensource.wolfsonmicro.com>
Date:	Wed, 30 Mar 2011 06:22:11 +0900
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Will Simoneau <simoneau@....uri.edu>
Cc:	Chuck Lever <chuck.lever@...cle.com>,
	Belisko Marek <marek.belisko@...il.com>,
	Trond.Myklebust@...app.com, bdowning@...os.net,
	linux-nfs@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [bisect] kernel 2.6.38 regression with root nfs mounting

On Tue, Mar 29, 2011 at 04:24:08PM -0400, Will Simoneau wrote:

> Interestingly, we are both using DM9000 network chips. I wonder if there
> is a UDP-related problem on the DM9000. I will play with my
> configuration a little more (in particular testing proto=tcp and revert
> of 53d4737580535e073963b91ce87d4216e434fab5) but my guess is the DM9000
> driver/chip is to blame. The DM9000A on my board has 16K of on-chip SRAM
> used for its RX/TX buffers which may be playing a part in the problem.

It's more likely that the DM9000 is just slow and fragile.  One thing to
note with a lot of the lower end network chips is that you end up
needing to specify rsize and wsize so that you don't get fragmentation -
about 1k tends to work well IME.  Otherwise performance often degrades
to the point of unusability.
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