[ofa-general] QP needs a lot of memory

[Sean Hefty]

>I am running OFED 1.4 on a Chelsio T3 RNIC.
>When I was trying to connect a large number of clients (several hundred),
>I noticed that the server was running out of memory. One instance of a
>whenever I do an rdma_create_qp(), I lose about 7MB of main memory.
>This severly limits the scalability of my application.
>
>Is there a reason for that?

The amount of memory needed per QP is based on the send and receive queue sizes,
plus the number of SGEs.  I don't know specific details about the Chelsio
adapter itself to know if 7MB is high or not.

- Sean