RDMA和TCP混跑性能问题

具体例子是一个server单进程，RDMA client端接收上游的http请求，处理请求后与下游RDMA server(s)通信，整合下游server结果并回复上游http client。启用RDMA会导致iobuf的分配函数被覆盖，与上游http client的通信会使用RDMA的memory pool导致不必要的竞争和开销。

Start by tracing the iobuf allocation function and the RDMA memory-pool setup in the mixed HTTP/TCP and RDMA server path described in the issue. Reproduce a single process receiving upstream HTTP requests while communicating with downstream RDMA servers; done means upstream TCP traffic no longer uses the RDMA pool unnecessarily and the resulting contention or overhead is addressed.

Written by the indexing model from the issue text.