COMMUNICATION DEVICE, COMMUNICATION METHOD, AND NON-TRANSITORY COMPUTER READABLE MEDIUM

• US 20170075844A1
• Filed: 09/14/2016
• Published: 03/16/2017
• Est. Priority Date: 09/15/2015
• Status: Abandoned Application

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: KOBAYASHI, Yuta, YAMAURA, Takahiro, YAMAGUCHI, Kensaku, ISHIHARA, Takeshi
• Application Number:
  US15/264,910
• Publication Number:
  US 20170075844A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G06F 13/28 using burst mode transfer, e.g. direct memory access DMA, cycle steal G06F13/32 takes precedence
• CPC Class Codes: G06F 13/4027 using bus bridges G06F13/4022 takes precedence

Abstract

In a communication device according to one embodiment, a bridge processor transmits, through the second communication processor, a first data transfer request having been received at the first communication processor and transmits, through the first communication processor, a first response having been received at the second communication processor. A cache proxy processor transmits a second response including the data through the first communication processor when the data is present in a storage device and when the data is not present, receives a third response including data by proxy from the second communication device and transmits a fourth response including the data through the first communication processor. A state acquiring circuit acquires information indicating a state of the storage device. A distribution processor determines which of the bridge processor and the cache proxy processor performs processing related to the first data transfer request according to the state of the storage device.

Claims

1. A communication device comprising:

a first communication processor configured to communicate with a first communication device;

a second communication processor configured to communicate with a second communication device; and

a bridge processor configured to perform bridge processing which receives a first data transfer request for the second communication device received at the first communication processor to transmit the first data transfer request through the second communication processor, and receives a first response having been received at the second communication processor to transmit the first response through the first communication processor, the first response including data requested by the first data transfer request;

a cache proxy processor configured to perform proxy processing which examines whether the data requested by the first data transfer request is present in a storage device, transmits a second response including the data through the first communication processor when the data is present, transmits a second data transfer request which requests transmission of the data for the second communication device through the second communication processor when the data is not present, stores a data included in a third response for the second data transfer request from the second communication device in the storage device and transmits a fourth response including the data through the first communication processor;

a state acquiring circuit which acquires information indicating a state of the storage device; and

a distribution processor configured to determine, when the first data transfer request is received at the first communication processor, one of the bridge processing and the proxy processing in accordance with the state of the storage device,

wherein the bridge processor performs the bridge processing when the bridge processor is determined and the cache proxy processor performs the proxy processing when the cache proxy processor is determined.

2. The communication device according to claim 1,

wherein the state acquiring circuit evaluates whether a load state of the storage device is high or low on the basis of the information indicating the state of the storage device, and

wherein the distribution processor determines the bridge processing when the load state of the storage device is high and determines the proxy processing when the load state of the storage device is low.

3. The communication device according to claim 2,

wherein the state acquiring circuit acquires information indicating a throughput of the storage device and evaluates the load state of the storage device on the basis of the throughput.

4. The communication device according to claim 2, comprising a request queue to store requests for writing into or reading from the storage device,

wherein the state acquiring circuit evaluates the load state of the storage device in accordance with a number of the requests which are present in the request queue.

5. The communication device according to claim 4, comprising a first general processor and a second general processor,

wherein the first general processor executes processing of the cache proxy processor, control processing of the first communication processor, control processing of the second communication processor and control processing of the storage device,

wherein the second general processor executes processing of the bridge processor, the distribution processor and the state acquiring circuit, and

wherein the state acquiring circuit of the second general processor acquires information of the number of the requests which are present in the request queue.

6. The communication device according to claim 1,

wherein the state acquiring circuit evaluates whether the storage device is in a normal state or in an abnormal state on the basis of the information indicating the state of the storage device, and

wherein the distribution processor determines the bridge processing when the storage device is in the abnormal state and determines the proxy processing when the storage device is in the normal state.

7. The communication device according to claim 5,

wherein the state acquiring circuit evaluates whether the load state of the storage device is high or low, and

wherein the distribution processor determines the bridge processor when the storage device is in the normal state and the load state of the storage device is high and determines the cache proxy processor when the storage device is in the normal state and the load state of the storage device is low.

8. The communication device according to claim 6,

wherein the distribution processor, after the abnormal state is determined, consistently determines the bridge processor without receiving a notification whether the storage device is in the normal state or in the abnormal state from the state acquiring circuit.

9. The communication device according to claim 8,

wherein the state acquiring circuit detects that the storage device becomes the normal state from the abnormal state, and

wherein the distribution processor, in response to the first data transfer request having been received at the first communication processor after the storage device becomes the normal state, receives the notification whether the storage device is in the normal state or in the abnormal state from the state acquiring circuit and determines the bridge processor when the storage device is in the abnormal state and determines the cache proxy processor when the storage device is in the normal state.

10. The communication device according to claim 1, further comprising the storage device.

11. The communication device according to claim 2,

wherein the state acquiring circuit acquires information on a reception frequency of the first data transfer request for which the cache proxy processor has been determined by the distribution processor and size information of data requested by the first data transfer request and evaluates the load state of the storage device in accordance with the information and the size information.

12. The communication device according to claim 7,

wherein the state acquiring circuit acquires information on a reception frequency of the first data transfer request for which the cache proxy processor has been determined by the distribution processor and size information of data requested by the first data transfer request and evaluates the load state of the storage device in accordance with the information and the size information.

13. The communication device according to claim 2,

wherein the state acquiring circuit acquires information on a transmission frequency of the second data transfer request and size information of data requested by the second data transfer request and evaluates the load state of the storage device in accordance with the information and the size information.

14. The communication device according to claim 2,

wherein the communication device receives instructions of writing or reading a file for the storage device from an application or a user and performs processing of writing or reading the file for the storage device, and

wherein the state acquiring circuit acquires information on a frequency of the instructions of the writing or the reading for the storage device and size information of the file, and evaluates the load state of the storage device on the basis of the information and the size information.

15. A communication method performed in a communication device including a first communication processor which communicates with a first communication device and a second communication processor which communicates with a second communication processor, comprising:

performing bridge processing which receives a first data transfer request for the second communication device received at the first communication processor to transmit the first data transfer request through the second communication processor, and receives a first response having been received at the second communication processor to transmit the first response through the first communication processor, the first response including data requested by the first data transfer request;

performing cache proxy processing which examines whether the data requested by the first data transfer request is present in a storage device, transmits a second response including the data through the first communication processor when the data is present, transmits a second data transfer request which requests transmission of the data for the second communication device through the second communication processor when the data is not present, stores a data included in a third response for the second data transfer request from the second communication device in the storage device and transmits a fourth response including the data through the first communication processor;

acquiring information indicating a state of the storage device; and

determining, when the first data transfer request is received at the first communication processor, one of the bridge processing and the cache proxy processing in accordance with the state of the storage device,

performing the bridge processing when the bridge processing is determined and performing the cache proxy processing when the cache proxy processing is determined.

16. A non-transitory computer readable medium having a program stored therein which, when executed by a computer including a first communication processor which communicates with a first communication device and a second communication processor which communicates with a second communication device, causes the computer to execute processing comprising:

performing bridge processing which receives a first data transfer request for the second communication device received at the first communication processor to transmit the first data transfer through the second communication processor, and receives a first response having been received at the second communication processor to transmit the first response through the first communication processor, the first response including data requested by the first data transfer request;

performing cache proxy processing which examines whether the data requested by the first data transfer request is present in a storage device, transmits a second response including the data through the first communication processor when the data is present, transmits a second data transfer request which requests transmission of the data for the second communication device through the second communication processor when the data is not present, stores a data included in a third response for the second data transfer request from the second communication device in the storage device and transmits a fourth response including the data through the first communication processor;

acquiring information indicating a state of the storage device; and

determining, when the first data transfer request is received at the first communication processor, one of the bridge processing and the cache proxy processing in accordance with the state of the storage device,

performing the bridge processing when the bridge processing is determined and performing the cache proxy processing when the cache proxy processing is determined.

17. A communication device comprising:

a first communication processor which communicates with a first communication device;

a second communication processor which communicates with a second communication device;

a bridge processor configured to perform bridge processing which receives a first data transfer request for the second communication device received at the first communication processor to transmit the first data transfer through the second communication processor, and receives a first response having been received at the second communication processor to transmit the first response through the first communication processor, the first response including data requested by the first data transfer request;

a cache proxy processor configured to perform proxy processing which examines whether the data requested by the first data transfer request is present in a storage device, transmits a second response including the data through the first communication processor when the data is present, transmits a second data transfer request which requests transmission of the data for the second communication device through the second communication processor when the data is not present, stores a data included in a third response for the second data transfer request from the second communication device in the storage device and transmits a fourth response including the data through the first communication processor;

wherein the first data transfer request is transmitted from the second communication processor when the first data transfer request is received at the first communication processor in a state in which a first access load is applied to the storage device, and

wherein the first data transfer request is not transmitted from the second communication processor when the first data transfer request is received at the first communication processor in a state in which a second access load lower than the first access load is applied to the storage device.