still nfs problems [Was: Linux 2.6.37-rc8]

[Russell King - ARM Linux]

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?