> I wonder if I might be seeing the same thing... > > How does one choose a good value for this setting? > > Apparently it maps to 4.096 x 2 ^ attr.timeout microseconds. > > What's the maximum value one can set here? > > What can go wrong if one goes for the maximum value?
In theory you want a timeout of around 2 * max packet life in the fabric (ie max RTT) plus max remote HCA ack time (reported in device properties). Max value is 31, which maps to a few hours. If you choose that, then a single lost packet will stall your connection for many hours (if you choose 7 retries) before reporting an error. - R. -- 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
