This configuration value sets the low-water safety mark, a buffer-pool level below which the STREAMS subsystem treats itself as critically short of memory for the STREAMS I/O subsystem on this host. The source MIB's own DESCRIPTION for this object is only the placeholder text "T B S" (to be supplied), so this reading is inferred from the object's name, its position in the STREAMS admin table (whose table-level DESCRIPTION says it holds "configuration information for a STREAMS subsystem"), and its Integer32 syntax; it is a resource-exhaustion threshold used internally to decide when to start refusing or throttling allocation requests.