How to increase the buffer size in Unix

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rdma_reg_read

RDMA_REG_READ(3)					   Librdmacm Programmer's Manual					  RDMA_REG_READ(3)

NAME

       rdma_reg_read - register data buffer(s) for remote RDMA read access.

SYNOPSIS

       #include <rdma/rdma_verbs.h>

       struct ibv_mr * rdma_reg_read (struct rdma_cm_id *id, void *addr, size_t length);

ARGUMENTS

       id	   A reference to a communication identifier where the message buffer(s) will be used.

       addr	   The address of the memory buffer(s) to register.

       length	   The total length of the memory to register.

DESCRIPTION

       Registers a memory buffer that will be accessed by a remote RDMA read operation.  Memory buffers registered using rdma_reg_read may be tar-
       geted in an RDMA read request, allowing the buffer to be specified on the  remote  side	of  an	RDMA  connection  as  the  remote_addr	of
       rdma_post_read, or similar call.

RETURN VALUE

       Returns	a  reference  to the registered memory region on success, or NULL on error.  If an error occurs, errno will be set to indicate the
       failure reason.

NOTES

       rdma_reg_read is used to register a data buffer that will be the target of an RDMA read operation  on  a  queue	pair  associated  with	an
       rdma_cm_id.   The  memory  buffer  is registered with the proteection domain associated with the idenfier.  The start of the data buffer is
       specified through the addr parameter, and the total size of the buffer is given by length.

       All data buffers should be registered before being posted as a work request.  Users  must  deregister  all  registered  memory  by  calling
       rdma_dereg_mr.

SEE ALSO

       rdma_cm(7), rdma_create_id(3), rdma_create_ep(3), rdma_reg_msgs(3), rdma_reg_write(3), ibv_reg_mr(3), ibv_dereg_mr(3), rdma_post_read(3)

librdmacm							    2010-07-19							  RDMA_REG_READ(3)

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