System and method for transferring data between a user space and a kernel space in a server associated with a distributed network environment

• US 7,587,510 B1
• Filed: 04/21/2003
• Issued: 09/08/2009
• Est. Priority Date: 04/21/2003
• Status: Active Grant

• Current Assignee: Charles Schwab & Company Incorporated (Charles Schwab Corporation)
• Original Assignee: Charles Schwab & Company Incorporated (Charles Schwab Corporation)
• Inventors: Klager, Andrew David, Rhudy, Robert Lee
• Primary Examiner(s): Etienne; Ario
• Assistant Examiner(s): Chea; Philip J
• Application Number:
  US10/420,055
• Time in Patent Office: 2,332 Days
• Field of Search: 709/203, 709/232, 709/217, 709/219, 709/250, 719/321, 719/328, 710/56, 710260-266
• US Class Current: 709/232
• CPC Class Codes: G06F 9/545 where tasks reside in different layers, e.g. user- and kernel-space
• CPC Class Codes: G06Q 40/04 Trading; Exchange, e.g. stocks, commodities, derivatives or currency exchange
• CPC Class Codes: G06Q 40/06 Asset management; Financial planning or analysis
• CPC Class Codes: H04L 43/0876 Network utilisation, e.g. volume of load or congestion level
• CPC Class Codes: H04L 47/10 Flow control; Congestion control
• CPC Class Codes: H04L 63/105 Multiple levels of security
• CPC Class Codes: H04L 69/16 Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
• CPC Class Codes: H04L 69/162 involving adaptations of sockets based mechanisms secure socket layer H04L63/168

Abstract

A system (150) and method provide for the transfer of at least one packet (194) comprising data between a user space (152) and a kernel space (154) associated with a server (156) that is positioned in a distributed network arrangement (192) with a plurality of clients (158, 160, 162, 164). A distribution program (168) associated with the user space (152) is operable to accumulate the at least one packet (194). An application program interface (174) associated with the user space (152) transfers the at least one packet (194) to the kernel space (154) with a number of software interrupts (204). A driver (176) associated with the kernel space (154) is operable to distribute the at least one packet (194) to a subset of the plurality of clients (158, 160, 162, 164) in response to receiving the number of software interrupts (204). The number of software interrupts (204) is less than one software interrupt per packet per client.

Claims

1. A system for transferring a data set, accumulated from a plurality of sources, to a plurality of clients, the system comprising:

a server, having a user space and a kernel space, in a distributed network arrangement with each of the plurality of clients over TCP/IP;

a computer-readable medium embodying;

a distribution program, wherein the distribution program operates in the user space, and wherein the distribution program accumulates a data set of packets from a plurality of sources;

an application program interface, wherein the application program interface operates in the user space, and wherein the application program interface transfers the accumulated data set of packets to the kernel space with only one software interrupt;

a memory structure, wherein the memory structure operates in the kernel space, and wherein the memory structure stores the accumulated data set of packets in a single buffer after the accumulated data set of packets has been transferred to kernel space, and

a driver, wherein the driver operates in the kernel space, and wherein the driver distributes the accumulated data set in the single buffer to the plurality of clients responsive to the one software interrupt, wherein the driver distributes the accumulated data set in the single buffer to the plurality of clients responsive to the one software interrupt by distributing each of the packets in the accumulated data set of packets to a proper socket connection in kernel space.

2. The system as recited in claim 1 wherein the accumulated data set comprises data related to securities.

3. The system as recited in claim 1 wherein the accumulated data set comprises data related to streaming content.

4. The system as recited in claim 1 wherein the distribution program accumulates the data set over a pre-determined period of time.

5. The system as recited in claim 1 wherein the driver forms a socket connection with a client in the plurality of clients to transfer the accumulated data set from the server to that client.

9. The system of claim 1 wherein the single buffer is a continuous block of memory in the server.

6. A system for transferring a data set, accumulated from a plurality of sources, between a kernel space in a server and a user space in the server, the server in a distributed network arrangement with a plurality of clients over TCP/IP, the system comprising:

a computer-readable medium embodying;

a driver, wherein the driver operates in the kernel space, and wherein the driver accumulates a data set of packets relating to data transfers between the plurality of clients and the server and, responsive to a single software interrupt, transfer the accumulated data set to the user space; and

a driver-compliant application program interface, wherein the driver-compliant application program interface operates in the user space, and wherein the driver-compliant application program interface receives the accumulated data set responsive to the single software interrupt; and

a memory structure, wherein the memory structure operates in the kernel space, and wherein the memory structure stores the accumulated data set in a single buffer;

wherein the driver transfers the accumulated data set in the single buffer to the user space responsive to the single software interrupt by transferring each of the packets in the accumulated data set of packets to a program in user space associated with a proper socket connection for each of the packets.

7. The system as recited in claim 6 wherein the driver accumulates the data set in response to a request from the user space.

8. The system as recited in claim 6 wherein the driver forms a socket connection with the plurality of clients to receive data for the accumulated data set.

10. The system of claim 6 wherein the single buffer is a continuous block of memory in the server.