On 16-12-2011 14:10, Hal Rosenstock wrote: >> They should be DDR cards. Does Rate=2 mean DDR? > > No; it means 1x SDR (lowest speed/width). 4x DDR would be rate 6 (20 > Gbps). See IBA 1.2.1 vol 1 PathRecord SA attribute Rate component. > > By default, OpenSM sets the rate for the IPoIB broadcast groups when not > explicitly specified is rate 3 (10 Gbps) which is 4x SDR.
I have a similar twin node that does work correctly (has DDR IB) and it says at ibstat: "Rate: 20" whereas the two that are having problems say "Rate: 2". Testing with openmpi osu_bw show: Rate=2: max bw: 245 MB/s Rate=20: max bw: 1970 MB/s greetings, Gerben -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
