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[Xen-users] How is the "cap" VM value is computed during execution?


I'm currently using Xen-4.1.5. 

I know that:
- At the beginning, each VM has a  256  weight as default .
- After each execution, the credit of the corresponding  VM is proportionnally decreased based on the period of execution.
Am i right?

Please i have the following question:
-What is the initial value of "credit"? The "credit" value correspond to what?
- How is it computed during VM execution?
-  VM are also characterized their "cap" value. I wish to understand how the "capping" of CPU is computed during the execution?  Then how are you doing to guarantee the "cap" of the VM.

PS:  I assume  that the cap is not null.

Thanks for response!


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