On Thu, Feb 18, 2021 at 11:13:43AM +0200, Gal Pressman wrote: > I'm a bit confused about the meaning of the ibv_req_notify_cq() verb: > "Upon the addition of a new CQ entry (CQE) to cq, a completion event will be > added to the completion channel associated with the CQ." > > What is considered a new CQE in this case? > The next CQE from the user's perspective, i.e. any new CQE that wasn't consumed > by the user's poll cq? > Or any new CQE from the device's perspective? new CQE from the device perspective. > For example, if at the time of ibv_req_notify_cq() call the CQ has received 100 > completions, but the user hasn't polled his CQ yet, when should he be notified? > On the 101 completion or immediately (since there are completions waiting on the > CQ)? 101 completion It is only meaningful to call it when the CQ is empty. Jason
