From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alan Cook Subject: Re: Unable to Connect Using Active Speed 2.5 Gbps and Active Width of 1 Date: Mon, 28 Mar 2011 20:41:35 +0000 (UTC) Message-ID: References: <4D90D9A2.7000107@dev.mellanox.co.il> <4D90DF38.1060407@dev.mellanox.co.il> <20110328194150.GA6205@obsidianresearch.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Return-path: Sender: linux-rdma-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: linux-rdma@vger.kernel.org Jason Gunthorpe writes: > > Are you using IPoIB to test your ping? You might be having multicast > group membership join problems due to a rate mismatch? Try one of the > low level verbs only diags. > I found the following issue when running ibdiagnet (which I had yet to run). -I--------------------------------------------------- -I- IPoIB Subnets Check -I--------------------------------------------------- -I- Subnet: IPv4 PKey:0x7fff QKey:0x00000b1b MTU:2048Byte rate:10Gbps SL:0x00 -W- Port raid1/P1 lid=0x0002 guid=0x0002c903000aa6d7 dev=26428 can not join due to rate:2.5Gbps < group:10Gbps -W- Port raid2/P1 lid=0x0001 guid=0x0002c903000aa6cf dev=26428 can not join due to rate:2.5Gbps < group:10Gbps -W- Suboptimal rate for group. Lowest member rate:120Gbps > group-rate:10Gbps I also changed the speed to 5 Gbps (which I thought had worked earlier) and I am unable to transfer using a width 1X. I receive the same warnings as above. After doing some searching, I created a partitions.conf (which did not exist at configured location in opensm.conf). I added the following line: Test,ipoib,rate=1,defmember=full:0x0002c903000aa6d7,0x0002c903000aa6cf; After restarting opensm.conf, I find that the above warnings in ibdiagnet no longer appear, but I am still unable to communicate between PCs. Did I miss something or do something incorrectly? -- 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