What is the Throttle Settings used for in Datapower Appliance?

In Datapower , under Administration -> Devices -> Throttle setting we have many parameters. But the description isn't clear enough on the functions it does.

Parameter :

Memory Throttle At %*

Memory Terminate At %*

Temp File Space Throttle At %*

Temp File Space Terminate At %*

XML Names Warn At %*

Timeout seconds*

Backlog Size*

Backlog Timeout seconds*

• Memory Throttle At %: Block incoming transactions when free memory is less than this %.
• Memory Terminate At %: Restart DataPower when free memory is less than this %.
• Temp File Space Throttle At %: Block incoming transactions when free temp storage is less this %
• Temp File Space Terminate At %: Restart DataPower when free temp storage is less than this %
• XML Names Warn At %: DataPower has a pool to store xml prefix, namespaces etc. within. At this level of free posts in the pool, warn.
• Timeout seconds: Restarts the DataPower when throttled for this amount of time.
• Backlog Size: Number of requests that are queued during throttling. If backlog is full, further requests are rejected.
• Backlog timeout seconds: Maximum time a request can be queued in backlog.