msgssz
msgssz specifies the message segment size that is to be
used when allocating message space in message queues.
1
8 bytes
Specify integer value. For more information, see Specifying Parameter Values.
msgseg, multiplied by
msgssz, defines the total amount of shared-memory
message space that can exist for all message queues, system-wide (not
including message header space).
msgssz specifies the size, in bytes, of the segments of
memory space to be allocated for storing IPC messages. Space for new
messages is created by allocating one or more message segments
containing msgssz bytes each as required to hold the entire
message.
msgmnb specifies how many
bytes of storage space are allowed in each message queue.
Total space available for all message queues is defined by the product
of msgseg * msgssz. Changing the ratio of these two values
changes how message space is fragmented for any given messaging usage
pattern.
(msgseg times
msgssz) must be greater than or equal to msgmax