From mboxrd@z Thu Jan 1 00:00:00 1970 From: Steve Wise Subject: Re: need pointer to Understand how to use IBV_WR_RDMA_WRITE_WITH_IMM Date: Tue, 07 Jun 2011 11:36:52 -0500 Message-ID: <4DEE53A4.3080409@opengridcomputing.com> References: <4DEE3326.9050105@redhat.com> <20110607163111.GA24005@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: <20110607163111.GA24005-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org> Sender: linux-rdma-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Jason Gunthorpe Cc: Steven Dake , Benoit Hudzia , linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: linux-rdma@vger.kernel.org On 06/07/2011 11:31 AM, Jason Gunthorpe wrote: > On Tue, Jun 07, 2011 at 07:18:14AM -0700, Steven Dake wrote: >> On 06/07/2011 05:23 AM, Benoit Hudzia wrote: >>> I am uncertain if this is the correct place for such email, please >>> point me to an appropriate mailing list place if not. >>> >>> I would like to use IBV_WR_RDMA_WRITE_WITH_IMM , however I am facing >>> difficulty to find documentation or example on how to use such >>> feature. The idea would be to do an RDMA write and wake up the peer >>> upon reception in order to process the received data. >>> >>> What I understand from IBV_WR_RDMA_WRITE_WITH_IMM: >> I would recommend against using IMM modes. I believe they are not >> supported on non-infiniband hardware, which limits your application from >> being used on Ethernet rdma systems. > There is some talk of fixing that in iWarp, the IMM stuff is much more > efficient than a RDMA + SEND combo. > iWARP 2.0: http://datatracker.ietf.org/doc/draft-ietf-storm-rdmap-ext/ > If you are going to use it, and care about iWarp then you should > design a fall back into your protocol to use RDMA + SEND.. I have some > stuff that works like this. > > 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 -- 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