A content delivery accelerator in data-intensive servers

  • Authors:

  • Joon-Woo Cho;Hyun-Jin Choi;Seung-Ho Lim;Kyu-Ho Park

  • Affiliations:

  • Computer Engineering Research Laboratory, EECS, Korea Advanced Institute of Science and Technology;Computer Engineering Research Laboratory, EECS, Korea Advanced Institute of Science and Technology;Computer Engineering Research Laboratory, EECS, Korea Advanced Institute of Science and Technology;Computer Engineering Research Laboratory, EECS, Korea Advanced Institute of Science and Technology

  • Venue:
  • NPC'05 Proceedings of the 2005 IFIP international conference on Network and Parallel Computing
  • Year:
  • 2005

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Abstract

The standard OS and server platform hardware have not been optimized for applications that transfer large multimedia files, resulting in poor server I/O performance. One source of the problem is that several redundant copies are introduces when the data is transferred from disks to a Network Interface Card. To solve the problem of redundant copies, we propose a Contents Delivery Accelerator that accelerates large file transfers by eliminating the redundant copies from disks to the NIC. To eliminate the redundant copies, the CDA introduces a new function, called a logical direct link, which provides the shortest path from the disks to the NIC. By using the shortest path, we can completely eliminate the redundant copies, thereby improving the I/O performance of server. The CDA architecture is a combined hardware-software approach. Thus, it comprises CDA hardware and a modified Linux kernel. We implemented the current version of the CDA on a Linux 2.4.18 kernel and an IXP1200 evaluation board. In the experiment, we compared the logical-direct path with a redundant path. For the transfer of data from disks to the NIC, our experimental results show that the average transfer latency of a direct path is as much as 30 percent less than a redundant path.