Re: Merge plans for RPC/RDMA? (Was: Re: [NFS] [PATCH 000 of 14] knfsd: Preparation for IPv6 support in NFS server.)

[Chuck Lever <chuck.lever@oracle.com>]

Mike Snitzer wrote:
> On 4/13/07, Chuck Lever <chuck.lever@oracle.com> wrote:
> > Mike Snitzer wrote:
> > > On 2/2/07, Chuck Lever <chuck.lever@oracle.com> wrote:
> > >> Roland Dreier wrote:
> > >> >  > They are mostly from Chuck Level and make preparating for IPv6
> > >> support
> > >> >  > in the NFS server.
> > >> >  > They are *not* for 2.6.20, but should be ok for .21.
> > >> >
> > >> > Out of curiousity, does this patch series reduce the delta 
> > between the
> > >> > NFS/RDMA tree and mainline Linux?  In other words does this bring
> > >> > NFS/RDMA closer to merging?
> > >>
> > >> Hi Roland-
> > >>
> > >> The client side support for an RPC/RDMA module is almost completely
> > >> integrated into mainline.  There is still a minimal set of patches
> > >> required to support alternate transports in loadable kernel modules
> > >> which Trond has indicated he will integrate when the RPC/RDMA 
> > transport
> > >> is ready to be integrated.
> > >
> > > Hi Chuck,
> > >
> > > I must be missing something because I don't see _any_ trace of the
> > > core RPC over RDMA support (xprtrdma et al), your RPC Transport
> > > Switch, or any of the other supporting changes in mainline.  Could
> > > you, or others, please clarify the plan for merging RPC/RDMA?
> >
> > The RPC transport switch patches are almost fully integrated into
> > mainline.  The xprtrdma piece is what is not there yet.
>
> OK, has the xprtrdma piece been reviewed by the community?  What, if
> anything, is preventing the code from being included in -mm for wider
> testing?

Some of the main NFS client developers (Trond, the CITI-UM developers, 
myself) have reviewed previous versions of this code, and have 
recommended a number of changes.  I haven't heard anything recently from 
the NetApp engineers working on this.  We are waiting for them to 
publish again, but I think they are waiting for the last of the 
transport switch patches to trickle into mainline (which should be ready 
with the release of 2.6.21).  I know they have been working with a 
handful of test sites and have achieved good performance results.

> Has xprtrdma inclusion/progress been discussed on some other mailing
> list?

Not yet, but the place that is likely to occur is nfs@lists.sourceforge.net.

begin:vcard
fn:Chuck Lever
n:Lever;Chuck
org:Oracle Corporation;Corporate Architecture: Linux Projects Group
adr:;;1015 Granger Avenue;Ann Arbor;MI;48104;USA
email;internet:chuck dot lever at nospam oracle dot com
title:Principal Member of Staff
tel;work:+1 248 614 5091
x-mozilla-html:FALSE
version:2.1
end:vcard