Asynchronous UDP

C. Yoo, H. W. Jin, S. C. Kwon

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


Network bandwidth has rapidly increased, and high-speed networks have come into wide use, but overheads in legacy network protocols prevent the bandwidth of networks from being fully utilized. Even UDP, which is far lighter than TCP, has been a bottleneck on high-speed networks due to its overhead. This overhead mainly occurs from per-byte overhead such as data copy and checksum. Previous works have tried to minimize the per-byte overhead but are not easily applicable because of their constraints. The goal of this paper is to investigate how to fully utilize the bandwidth of high-speed networks. We focus on eliminating data copy because other major per-byte overhead, such as checksum, can be minimized through hardware. This paper introduces a new concept called Asynchronous UDP and shows that it eliminates data copy completely. We implement Asynchronous UDP on Linux with ATM and present the experiment results. The experiments show that Asynchronous UDP is much faster than the existing highly optimized UDP by 133% over ATM. In addition to the performance improvement, additional advantages of Asynchronous UDP include: (1) It does not have constraints that previous attempts had, such as copy-on-write and page-alignment; (2) It uses much less CPU cycles (up to 1/3) so that the resources are available for more connections and/or other useful computations; (3) It gives more flexibility and parallelism to applications because applications do not have to wait for the completion of network I/O but can decide when to check the completion.

Original languageEnglish
Pages (from-to)3243-3251
Number of pages9
JournalIEICE Transactions on Communications
Issue number12
Publication statusPublished - 2001 Dec


  • ATM
  • Asynchronous UDP
  • High-speed network
  • UDP
  • Zero-copy

ASJC Scopus subject areas

  • Software
  • Computer Networks and Communications
  • Electrical and Electronic Engineering


Dive into the research topics of 'Asynchronous UDP'. Together they form a unique fingerprint.

Cite this