Virtual machine system

Details Virtual machine system Virtual machine system

2011-08-30

2011-08-30

Kindred, Alford W (Department: 2181)

Electrical computers and digital data processing systems: input/

Input/output data processing

Input/output access regulation

C710S039000, C710S036000, C710S022000, C710S062000

Reexamination Certificate

active

08010719

ABSTRACT:
Arbitration of IO accesses and band control based on the priority of virtual servers is enabled while curbing performance overhead during IO sharing among the virtual servers. A virtual machine system includes a CPU, a memory, a hypervisor that generates plural virtual servers, and an IO controller that controls an IO interface. The IO controller includes: a DMA receiving unit that receives DMA requests from the IO interface; a decoder that decodes received DMA requests and locates the corresponding virtual servers; a DMA monitoring counter that monitors DMA processing status for each of the virtual servers; a threshold register set in advance for each of the virtual servers; and a priority deciding unit that compares the DMA monitoring counter and the value of the threshold register, and based on processing priority obtained as a result of the comparison, decides the priority of processing of the received DMA requests.

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