swirec_disk_cache_low_water_mark
                                                    Largest size of the disk and inet caches after cache cleanup.
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                                                                     Value  | 
                                                                
                                                                     Integer: 1–INT_MAX. Reasonable range: 1–swirec_disk_cache_size  | 
                                                            
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                                                                     Default  | 
                                                                
                                                                     400 (MB)  | 
                                                            
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                                                                     How to set  | 
                                                                
                                                                     In Management Station set on the Nuance recognition service. If not using Management Station, set in a Recognizer configuration file (User-nrsxx.xml).  | 
                                                            
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                                                                     Usage  | 
                                                                
                                                                     This parameter is only relevant when swirec_disk_cache_enabled is enabled. Occasionally used during application tuning. When grammars load too slowly, increasing this value can help. (You might also need to compensate by increasing swirec_disk_cache_size and the swirec_memory_cache_size). This is a system-wide parameter. The setting applies to all applications using Recognizer.  | 
                                                            
Specify a size that is significantly less than the total cache size (for example, about 25% of the total). The value affects how much space the Recognizer frees when it needs new space in the disk cache: it frees entries until the cache size is at or below the low water mark. (The Recognizer releases entries that are least-recently used.)
Also, see the full list of caching parameters in Fetching and caching parameters.