sysctl -da
if you don't know what all those sysctl's are for... the -d option might give you a hint ...
eg.
flogster:/ # sysctl -da|fgrep msg
kern.ipc.msgseg: Number of message segments
kern.ipc.msgssz: Size of a message segment
kern.ipc.msgtql: Maximum number of messages in the system
kern.ipc.msgmnb: Maximum number of bytes in a queue
kern.ipc.msgmni: Number of message queue identifiers
kern.ipc.msgmax: Maximum message size
kern.consmsgbuf_size: Console tty buffer size
kern.features.sysv_msg: System V message queues support
kern.msgbuf_show_timestamp: Show timestamp in msgbuf
kern.msgbufsize: Size of the kernel message buffer
kern.msgbuf_clear: Clear kernel message buffer
kern.msgbuf: Contents of kernel message buffer
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