From mboxrd@z Thu Jan 1 00:00:00 1970 From: Steve Wise Subject: Re: [PATCH v2] RDMA/CMA: fix iWARP adapter TCP port space usage Date: Fri, 11 Jun 2010 20:18:43 -0500 Message-ID: <4C12E073.2040008@opengridcomputing.com> References: <20100611124746.GA2292@CTUNG-MOBL1> <2EFBCAEF10980645BBCFB605689E08E904924CCE42@azsmsx506.amr.corp.intel.com> <4C12A6E8.5040400@opengridcomputing.com> <20100611224126.GA4630@obsidianresearch.com> <4C12C971.4000909@opengridcomputing.com> <20100612000431.GC4630@obsidianresearch.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20100612000431.GC4630-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org> Sender: linux-rdma-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Jason Gunthorpe Cc: Roland Dreier , "Tung, Chien Tin" , "linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" , "Waskiewicz Jr, Peter P" List-Id: linux-rdma@vger.kernel.org Jason Gunthorpe wrote: > On Fri, Jun 11, 2010 at 06:40:33PM -0500, Steve Wise wrote: > > >> No, everything does not work without this patch. Go read the thread >> from 2007 (I posted the URL to it on this thread). I describe exactly >> how an application like MPI will get incorrect behavior due to port >> space collisions on iWARP HW. >> > > I guess I missed the fact that OFED included this patch, rather than > relying on the other administratively configured schemes you > originally outlined. I was opining that nobody was complaining about > the administrative stuff.. but of course nobody complains, they don't > have to do it :( > > A seperate IP for iWarp always seemed to me to be the way forward on > this. And I do mean seperate, as in TCP packets for this IP are never > sent into the net stack seperate :| > > From a user perspective, separate IP addresses for iWARP is terrible. Further, its not even needed for IB, just iWARP. That's an unnecessary admin pain IMO. iWARP should and can easily co-exist with the host TCP by sharing the port space. But, as Roland stated already, maybe the only way forward it to get end-user pressure applied at the appropriate places! :) Steve. -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html