Hi all:
It is a puzzle to me that we allocate rsp buffers for rspond
content in function client3_3_readv, but these rsp parameters hasn't
ever been saved to struct saved_frame in submit procedure. Which means
the iobuf will reallocated by transport layer in function
__socket_read_accepted_successful_reply.
According to the commnet of fucntion rpc_clnt_submit :
1. Both @rsp_hdr and @rsp_payload are optional.
2. The user of rpc_clnt_submit, if wants response hdr and payload in its own
buffers, then it has to populate @rsphdr and @rsp_payload.
....
The rsp_payload is optional, ransport layer will not reallocate
rsp buffers if
it populated. But the fact is readv operation will allocate rsp buffer twice.
Thanks
Zhengping
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