linux-kernel - Re: still nfs problems [Was: Linux 2.6.37-rc8]

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Message-ID: <20110106180530.GI31708@n2100.arm.linux.org.uk>
Date:	Thu, 6 Jan 2011 18:05:30 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	James Bottomley <James.Bottomley@...senPartnership.com>
Cc:	Trond Myklebust <Trond.Myklebust@...app.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-nfs@...r.kernel.org, linux-kernel@...r.kernel.org,
	Marc Kleine-Budde <mkl@...gutronix.de>,
	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>,
	Marc Kleine-Budde <m.kleine-budde@...gutronix.de>,
	linux-arm-kernel@...ts.infradead.org,
	Parisc List <linux-parisc@...r.kernel.org>,
	linux-arch@...r.kernel.org
Subject: Re: still nfs problems [Was: Linux 2.6.37-rc8]

On Thu, Jan 06, 2011 at 11:40:13AM -0600, James Bottomley wrote:
> On Wed, 2011-01-05 at 23:28 +0000, James Bottomley wrote:
> > Can you explain how the code works? it looks to me like you read the xdr
> > stuff through the vmap region then write it out directly to the pages? 
> 
> OK, I think I see how this is supposed to work:  It's a sequential loop
> of reading in via the pages (i.e. through the kernel mapping) and then
> updating those pages via the vmap.  In which case, I think this patch is
> what you need.
> 
> The theory of operation is that the readdir on pages actually uses the
> network DMA operations to perform, so when it's finished, the underlying

What network DMA operations - what if your NIC doesn't do DMA because
it's an SMSC device?
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