[PATCH RFC] nvme-rdma: support devices with queue size < 32

[Sagi Grimberg]

>> You say above "we post *up to* 2 work requests", unless you wish to
>> change that to "we always post at least 2 work requests per queue
>> entry", Jason is right, your frequency of signaling needs to be X/2
>> regardless of your CQ size, you need the signaling to control the queue
>> depth tracking.
>
> If you would like to spread things out farther between signaling, then
> you can modify your send routine to only increment the send counter for
> actual send requests, ignoring registration WQEs and invalidate WQES,
> and then signal every X/2 sends.

Yea, you're right, and not only I got it wrong, I even contradicted my
own suggestion that was exactly what you and Jason suggested (where is
the nearest rat-hole...)

So I suggested to signal every X/2 and Marta reported SQ overflows for
high queue-dpeth. Marta, at what queue-depth have you seen this?