Return-Path: Received: from quartz.orcorp.ca ([184.70.90.242]:53252 "EHLO quartz.orcorp.ca" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751165AbdBWU1U (ORCPT ); Thu, 23 Feb 2017 15:27:20 -0500 Date: Thu, 23 Feb 2017 13:26:09 -0700 From: Jason Gunthorpe To: "J. Bruce Fields" Cc: Tom Talpey , Jeff Layton , trond.myklebust@primarydata.com, schumaker.anna@gmail.com, linux-nfs@vger.kernel.org, Chuck Lever , linux-rdma@vger.kernel.org Subject: Re: [PATCH 1/4] sunrpc: flag transports as using IETF approved congestion control protocols Message-ID: <20170223202609.GC26301@obsidianresearch.com> References: <20170223170337.10686-1-jlayton@redhat.com> <20170223170337.10686-2-jlayton@redhat.com> <2152dfdf-f847-2511-1600-6499b6ea9708@talpey.com> <1487880034.3448.8.camel@redhat.com> <65056db6-f30a-c44d-b01c-b549887c4895@talpey.com> <20170223201109.GC11882@fieldses.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii In-Reply-To: <20170223201109.GC11882@fieldses.org> Sender: linux-nfs-owner@vger.kernel.org List-ID: On Thu, Feb 23, 2017 at 03:11:09PM -0500, J. Bruce Fields wrote: > (And if we really shouldn't be doing NFSv4 over some RDMA transports--is > it worth supporting them at all, if the only support we can get is > NFSv3-only?) This seems like a strange comment - NFSv4 should be supported on all RDMA transports, surely? Largely RDMA lives in its own congestion management world. If a site is running RDMA they have done something to mitigate interactions with TCP style congestion control on the same wire. Jason