Maintaining hardware resource bandwidth quality-of-service via hardware counter
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United States of America Patent
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Nov 10, 2015
Grant Date -
Jan 2, 2014
app pub date -
Jun 30, 2012
filing date -
Jun 30, 2012
priority date (Note) -
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Abstract
Each time a currently scheduled virtual machine (VM) accesses a hardware resource over a bus for the hardware resource via the currently scheduled VM running on a processor, a hardware component adjusts a bandwidth counter associated with usage of the bus for the hardware resource, without involvement of the currently scheduled VM or a hypervisor managing the currently scheduled VM. Responsive to the bandwidth counter reaching a threshold value, the hardware component issues an interrupt for handling by the hypervisor to maintain bandwidth quality-of-service (QoS) of bus bandwidth related to the hardware resource. Upon expiration of a regular time interval prior to the bandwidth counter reaching the threshold value, the hardware component resets the bandwidth counter to a predetermined value associated with the currently scheduled VM, without involvement of the currently scheduled VM or the hypervisor; the hardware component does not issue an interrupt. The hardware resource can be memory.
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