From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jason Gunthorpe Subject: Re: [PATCH v2] RDMA/CMA: fix iWARP adapter TCP port space usage Date: Fri, 11 Jun 2010 19:56:52 -0600 Message-ID: <20100612015652.GA7648@obsidianresearch.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> <4C12E073.2040008@opengridcomputing.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <4C12E073.2040008-7bPotxP6k4+P2YhJcF5u+vpXobYPEAuW@public.gmane.org> Sender: linux-rdma-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Steve Wise Cc: Roland Dreier , "Tung, Chien Tin" , "linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" , "Waskiewicz Jr, Peter P" List-Id: linux-rdma@vger.kernel.org On Fri, Jun 11, 2010 at 08:18:43PM -0500, Steve Wise wrote: > Further, its not even needed for IB, just iWARP. That's an unnecessary > admin pain IMO. IB already completely seperates from the host stack, that is why it isn't effected by this problem. It has both a seperate port numbering space (in rdma cm) and a separate addressing space (GID). The entire problem with iWARP is that it is trying to not be seperate, unlike IB. So.. simple answer: use a seperate IP, or use a seperate port space (ie don't use the TCP protocol number). ROCEE won't have this problem either.. > 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! :) *shrug* This isn't going to happen until netdev decides to design-in statefull offload. I doubt that is going to happen any time soon. I've already seen Linux max out 40GE on benchmarks, so it is hard to see what the driver would be. Jason -- 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