On Fri, Jan 29, 2010 at 11:43 AM, Hefty, Sean <[email protected]> wrote: >>uint8_t timeout; /* Local ack timeout for primary path (valid only for RC >>QPs)*/ >> >>I believe that this is the period of time (in seconds) that the IB HCA >>will wait for the ACK for a packet it sent out before re-transmitting? I >>was looking as to whether this field can be modified when creating a QP >>using RDMA_CM. > > This field is set based on the packet lifetime carried in the path record. > If you're using opensm, there's probably a configuration option that can > adjust this (subnet timeout, maybe?).
Yes, OpenSM returns subnet_timeout as the SA PathRecord PacketLifeTime assuming it's not loopback and no QoS set. -- Hal > The time given for the QP attribute is in 'IB time': 4.096 x 2 ^ timeout > micro-seconds. > > - Sean > -- > 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 > -- 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
