[ewg] Re: [ofa-general] OFED July 2, meeting summary on next OFED plans

[Tom Tucker]

Roland:

On Tue, 2007-07-03 at 15:35 -0500, Steve Wise wrote:
> Tom, can you update us on NFS-RDMA?
> 
> 
> Roland Dreier wrote:
> >  > NFSoRDMA integration.
> > 
> > I would like to see a status report on NFS/RDMA from the people who
> > want it in OFED.  As I understand it there are many core kernel
> > changes required for this -- switchable transports and also mount
> > option changes?

You are correct about the scope of the changes, although many of them
are already in the kernel. Chuck Lever just posted the mount changes and
I have posted a second round of the NFS-RDMA patches. You can see these
on nfs at lists.sourceforge.net. I would like to get them upstream in
2.6.23, but that's probably optimistic. 

> > 
> > As far as I can tell from the outside, the NFS/RDMA effort seems to
> > have stalled -- whenever I talk to core NFS developers like Chuck
> > Lever or Trond Myklebust, they say that they are just waiting for the
> > NFS/RDMA developers to submit their changes for review.  And I haven't
> > seen any patches for a kernel newer that 2.6.18, so things look quite
> > out-of-date.

I'm not sure when you talked to those guys, but as I mentioned, this is
round-two of the patch submission. There is also a git tree that has
these submitted patches available for download and testing. These are on
a 2.6.22-rc6 base and the git URL is
git://linux-nfs.org/~tomtucker/nfs-rdma-dev-2.6.git

If you like, I can post the patchset here as well.

> > 
> > Without visible progress towards getting NFS/RDMA into mergeable form
> > soon, I think putting it into OFED 1.3 as anything other than a
> > technology preview that may be dropped from future releases would be a
> > very risky think to do.  Otherwise OFED risks getting stuck
> > maintaining the whole NFS/RDMA stack, since the development effort
> > outside of OFED really looks to me like it is fizzling out.
> > 

Perhaps the activity is not where you're used to looking. Both Trond and
Neal reviewed the previous patchset and provided feedback that I
addressed in the most recent patchset. That said, I'm sure there will be
quite a bit more before it's mergeable. 

> >  - R.
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