Storage system having an adaptive workload-based command processing clock

Patent metadata

Field	Value
Publication number	US-10534546-B2
Application number	US-201715621480-A
Country	US
Kind code	B2
Filing date	Jun 13, 2017
Priority date	Jun 13, 2017
Publication date	Jan 14, 2020
Grant date	Jan 14, 2020

Abstract

A storage system having an adaptive workload-based command processing clock is provided. In one embodiment, a storage system has a memory, a command processing path, and a controller in communication with the memory and the command processing path. The controller is configured to adapt an input clock signal based on a current workload of the controller and provide the adapted clock signal to the command processing path in the controller.

First claim

What is claimed is:

1. A storage system, comprising:
a memory;
a command processing path; and
a controller for communication with the memory and the command processing path, wherein the controller is configured to:
adapt an input clock signal based on a workload of the controller, wherein when the workload of the controller increases, the controller is configured to adapt the input clock signal by decreasing a rate of the input clock signal; and
provide the adapted input clock signal to the command processing path in the controller,

wherein the workload is based on a size of one or more data packets associated with one or more commands, and
wherein when the size of one or more data packets increases, the controller is configured to adapt the input clock signal by decreasing the rate of the input clock signal.

2. The storage system of claim 1 , wherein the controller comprises:
a workload monitor counter;
an outstanding command counter; and
at least one divider configured to adapt the input clock signal by dividing the input clock signal by a quotient of a value of the workload monitor counter divided by a value of the outstanding command counter.

3. The storage system of claim 1 , wherein the command processing path comprises one or more of a command parser, a command executor, or a front-end processor.

4. The storage system of claim 1 , wherein the memory comprises a three-dimensional memory, and wherein the storage system is embedded in a host.

5. The storage system of claim 1 , wherein the storage system is removably connected to a host.

6. A method for using a storage system with an adaptive clock, the method comprising:
performing the following in a storage system comprising a memory and a controller:
calculating an average workload per command;
modifying a clock signal based on the calculated average workload per command, wherein when the calculated average workload per command increases, a frequency of the clock signal is decreased; and
providing the modified clock signal to at least one component in the controller,

wherein the calculated average workload is based on a size of one or more data packets associated with one or more commands, and
wherein when the size of one or more data packets increases, the frequency of the clock signal is decreased.

7. The method of claim 6 , wherein the average workload per command is calculated using a first counter that tracks data transfer sizes of pending commands, a second counter that tracks a number of pending commands, and a divider that divides a value of the first counter by a value of the second counter.

8. The method of claim 6 , wherein the clock signal is modified by dividing the clock signal by the calculated average workload per command.

9. The method of claim 6 , wherein the clock signal is modified using a workload-based clock generator in the controller.

10. The method of claim 6 , wherein the at least one component in the controller comprises a command processing component, and wherein the storage system comprises a solid state drive.

11. The method of claim 10 , wherein the solid state drive comprises an enterprise solid state drive.

12. A storage system, comprising:
a memory; and
means for generating, using a controller of the storage system, a variable clock signal based on a number of commands and a data transfer size associated with the commands and for providing the variable clock signal to a command processing component,
wherein the means for generating, using the controller of the storage system, the variable clock signal comprises means for increasing a rate of the variable clock signal when a ratio of the data transfer size to the number of commands decreases,
wherein the data transfer size associated with the commands is based on a size of one or more data packets associated with the commands, and
wherein the means for generating, using the controller of the storage system, the variable clock signal comprises means for decreasing the rate of the variable clock signal when the size of one or more data packets increases.

13. The storage system of claim 12 , wherein the means for generating comprises at least one counter and at least one divider.

14. The storage system of claim 12 , wherein the command processing component comprises one or more of a command parser, a command executor, or a front-end processor.

15. The storage system of claim 12 , wherein the memory comprises a three- dimensional memory.

16. The storage system of claim 12 , wherein the storage system is embedded in a host.

17. The storage system of claim 12 , wherein the storage system is removably connected to a host.

18. The storage system of claim 12 , wherein the means for generating, using the controller of the storage system, the variable clock signal comprises means for decreasing the variable clock signal when a quotient of the data transfer size divided by the number of commands increases.

Assignees

• Western Digital Tech Inc

Inventors

• Benisty Shay
• Sharifie Tal

Classifications

• G06F3/061

  Improving I/O performance · CPC title

• G06F3/0659

  Command handling arrangements, e.g. command buffers, queues, command scheduling · CPC title

• G06F3/0625

  Power saving in storage systems · CPC title

• G06F3/0653

  Monitoring storage devices or systems · CPC title

• G06F3/0613 Primary

  in relation to throughput · CPC title