Bandwidth limiting in solid state drives

Abstract

The present disclosure generally relates to limiting bandwidth in storage devices. One or more bandwidth quality of services levels may be selected and associated with commands according to service level agreements, which may prioritize some commands over others. A storage device fetches and executes one or more the commands. Each of the commands is associated with a bandwidth quality of service level. After executing the commands and transferring the data to a host device, the storage device may delay writing a completion entry corresponding to the executed commands to a completion queue based on the associated bandwidth quality of service level of the commands. The device may then delay revealing the completion entry by delaying updating a completion queue head pointer. The device may further delay sending an interrupt signal to the host device based on the associated bandwidth quality of service level of the commands.

Description

BACKGROUND OF THE DISCLOSUREField of the Disclosure[0001]Embodiments of the present disclosure generally relate to storage devices, such as sold state drives (SSDs).Description of the Related Art[0002]Service Level Agreements (SLAs) are often held by retailers of SSDs, or persons selling storage solutions, who have multi-tenant systems. Each multi-tenant system may cover many subscribers and customers, virtual machines, or applications, all of which desire a share of the available bandwidth of the system. As available bandwidth is a limited resource, the SLAs generally assure a quantity of available drive bandwidth and quality of service (QoS) for different price tiers. SLAs also aim to provide customers with an assured and accurate QoS and / or bandwidth throughput guarantees. SLAs may limit BW, QoS, or in a combination of both available to the tenants, and may set minimums, maximums, and relational changes in both BW and QoS. The assurances in an SLA may be to provide a minimum or a...

AI Technical Summary

Benefits of technology

The present patent relates to controlling bandwidth in storage devices. It describes methods for prioritizing commands based on their quality of service level, and for delaying the execution and transfer of data to a host device based on the associated quality of service level of the commands. The technical effect of this patent is to optimize bandwidth usage in storage devices, ensuring efficient processing and minimizing delays in data transfer.

Problems solved by technology

The device may then delay revealing the completion entry by delaying updating a completion queue head pointer.

The device may further delay sending an interrupt signal to the host device based on the associated bandwidth quality of service level of the commands.

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