Hi all:

   I know that the CompletionQueue is application threads driven, which
means that the requests entrusted on the CQ will be sent out  on the wire only
after there are some application threads polling on it. Before that, none
of the  requests will be sent, here is a github question
<https://github.com/grpc/grpc/issues/14104> to consult to.

   But I found that if I entrust enough requests to a CQ ( ~50k),  before
any threads start polling on it, the CQ has already sent some of them out
to the server!  It seems that the #request has reached some threshold, and
CQ just can't hold the them so having to just let them go.

   Am I understanding this correctly?  There is no problems with this
behavior for me except that bring troubles on benchmark : I don't know the
exact start point when the server start processing , and can't get an
accurate throughput data.

   language : c++ (for both client & server)
   grpc version : v1.21.x
   OS : win10 pro
   compiler : vs2015 Microsoft (R) C/C++ Optimizing Compiler Version
19.00.24215.1 for x86



- Regards
- Arthur

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