Hi, Le mercredi 18 juillet 2012 à 15:49 +0000, Hefty, Sean a écrit : > > Is there a way to setup the timeout in rdma_connect() ? > > For IB, the timeout is based on the packet lifetime in the path record > returned by the SA. > The rdma_cm will retry a CM REQ the maximum number of times (15). >
According to the OpenSM default configuration (/usr/sbin/opensm --create-config <config>) : # The subnet_timeout code that will be set for all the ports # The actual timeout is 4.096usec * 2^<subnet_timeout> subnet_timeout 18 # The code of maximal time a packet can live in a switch # The actual time is 4.096usec * 2^<packet_life_time> # The value 0x14 disables this mechanism packet_life_time 0x12 Despite the notation, they are the same values. It gives me: 4.096 * 10^-6 * 2^18 = 1.074 s 15 * subnet timeout / packet life time = 16.106 s ... This is a lot less than 98 s. Where does come the difference ? > > Is there a way to change the CM parameters ? e.g. "Service Timeout" to > > wait for moving from "REP wait" state to "Timeout" state, and the number > > of send "REQ" retries (From 12.9.5 "Communication Establishement and > > Release - Active") ? > > There is no direct way to change the timeout parameter. You would need to > adjust the subnet timeout values at the SA. Is it subnet_timeout or packet_life_time ? Thanks for your answers. Regards. -- Yann Droneaud OPTEYA -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
