Thank you, there is a wealth of information with the "-v" switch. For the Mellanox Connect-5 that I'm using I see: max_cq: 16777216 max_cqe: 4194303 I'm encountering a smaller limit on the maximum entries, so I presume this is the max total number of cqe for all queues in the system. Regards Dimitris > > Hi, > > > > I'm running the ibv_rc_pingpong example and I notice as as rx-depth > > increases the QP create fails, eg at 50k. My understanding is this > > variable controls the number of RECV WR that will be posted in advance > > before SEND WRs are posted. > > > > Is there a limitation on the queue size (the size is unit32_t) and if > > so why ? Also is there a way around it ? > > The rx-depth is translated to the size of completion queue buffer. > That buffer used by hardware to post completions - writing completion > queue elements (CQEs) and it is allocated when creating the CQ. > > Maximum number of CQEs can be retrieved by the ibv_devinfo -v, see max_cqe field.
