From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alan Cook Subject: Unable to Connect Using Active Speed 2.5 Gbps and Active Width of 1 Date: Mon, 28 Mar 2011 18:01:23 +0000 (UTC) Message-ID: 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 In trying to support various speeds with my application, I attempted to change the speed and width of Infiniband card using ibportstate. I had difficulty with the reliability of the setting changes working. I found that I needed to set "force_link_speed 0" in /etc/ofed/opensm.conf. Once that change as made the service restarted, I was able to reliably change settings on the cards. All was well until I changed the card to 2.5 x1. At this point, I was unable to ping the other machine. Both PCs show that the link is up and active, but I am unable to get any communication between the two. I tried both ping and ibping with no success. I brought the interfaces down and back up, but that did not solve the issue. I have been using the following commands (as root) to adjust the speed and width: ibportstate -C mlx4_0 -D 0 1 speed [1-7] ibportstate -C mlx4_0 -D 0 1 width [1|2] ibportstate -C mlx4_0 -D 0 1 reset I was able to both ping and ibping when using the following speed and width configurations: 2.5 Gbps x4 5.0 Gbps x1 5.0 Gbps x4 10.0 Gbps x1 10.0 Gbps x4 The only setting configuration that does not work is the 2.5 x1. Is there something that I am missing? -- 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