On Tue, 4 Mar 2008, Steve Wise wrote:
> All, > > This question is regarding SENDs arriving when no RECV buffer is > posted. For IB, somehow the transport can deal with this and force > the sender transport to retransmit. > > First, is my statement above correct? This is correct for IB's RC and RD transports. The IBTA spec has more info (see RNR retry and RNR timer). The struct ib_qp_attr's min_rnr_timer and rnr_retry fields allow fine grained control of these values (rnr_retry == 7 means infinite). ULPs generaly interact with these values through either the IB CM's struct ib_cm_req_param/struct ib_cm_rep_param (if the ULP is IB specific) or the RDMA CM's struct rdma_conn_param. > If so, How can I detect that this is happening on an IB RC? IE is > there some stat I can query? Good question. I don't see an obvious stat in /sys/class/infiniband. _______________________________________________ general mailing list [email protected] http://lists.openfabrics.org/cgi-bin/mailman/listinfo/general To unsubscribe, please visit http://openib.org/mailman/listinfo/openib-general
