From: braet_kamiel@nl.ibm.com
Date: Tue Feb 17 2004 - 15:20:29 GMT-3
The explanation as described below applies to both FRTS and GTS:
These Bc, Be and Tc variables have the following relations.
- Be and Bc determine the size of the token bucket.
- Tc and Bc determine the amount of tokens that is added to the bucket as a function of time.
The token bucket and the tokens can be defined as follows:
- The token bucket can be seen as a buffer for tokens, the size of the bucket defines how many tokens can be held.
- The amount of tokens in the bucket represent the amount of data that can be sent at any given time.
That's all you really have to know. But based on this you can come up with the following conclusions.
- Bc and Tc determine together the long-term MAXIMUM average data stream.
- If the bucket fills to capacity Bc + Be, newly arriving tokens are discarded. Therefore the bucket specifies the MAXIMUM amount of tokens in the bucket, Bc and Be defines the maximum amount of data that can be sent at any given time.
- Since Be among others defines the size of the bucket, Be defines how many UNUSED tokens can be saved (or buffered) to use later on, and does NOT have anything to do with Tc.
From this you can say:
- The size of the bucket determines amount VARIATION a dataflow can have, while still being able to utilize the long-term maximum average data stream.
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