And just to complete the picture: RoCE runs on top of Ethernet (layer 2) IB runs on top of IB network, link and phy layers iWARP runs on top of TCP/IP (as Steve says below).
Both RoCE and IB use the same transport layer. > -----Original Message----- > From: ewg-boun...@lists.openfabrics.org [mailto:ewg- > boun...@lists.openfabrics.org] On Behalf Of Steve Wise > Sent: Thursday, March 03, 2011 9:54 AM > To: fanqie...@gmail.com > Cc: ewg@lists.openfabrics.org > Subject: Re: [ewg] iWARP WAN test problem > > Unlike Infiniband, iWARP runs on top of TCP/IP and thus is routable. > > > On 03/03/2011 07:45 AM, Tanin wrote: > > Thanks, Richard. > > So, is that also apply to iWARP? If there is an IP router in between the > path, iWARP would not work, right? > > > > On Thu, Mar 3, 2011 at 4:21 AM, rich...@informatix-sol.com > <mailto:rich...@informatix-sol.com> > > <rich...@informatix-sol.com <mailto:rich...@informatix-sol.com>> wrote: > > > > RDMA only works over layer2 Ethernet. If you have an IP router in > path it won't work. > > For long haul infiniband we use buffer devices, such as obsidian > longbows, to sustain throughput over the long haul. > > > > Richard > > > > > > > > > > -- > > Best regards, > > ------------------------------------------------------------------------ > ----------------------- > > Li, Tan > > PhD Candidate & Research Assistant, > > Electrical Engineering, > > Stony Brook University, NY > > > > Personal Web Site: https://sites.google.com/site/homepagelitan/Home > > > > Email: fanqie...@gmail.com <mailto:fanqie...@gmail.com> > > > > > > _______________________________________________ > > ewg mailing list > > ewg@lists.openfabrics.org > > http://lists.openfabrics.org/cgi-bin/mailman/listinfo/ewg > > _______________________________________________ > ewg mailing list > ewg@lists.openfabrics.org > http://lists.openfabrics.org/cgi-bin/mailman/listinfo/ewg _______________________________________________ ewg mailing list ewg@lists.openfabrics.org http://lists.openfabrics.org/cgi-bin/mailman/listinfo/ewg