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USENIX Technical Program - Abstract - Internet Technologies & Systems 99
On the Performance of TCP Splicing for URL-aware Redirection
Ariel Cohen, Sampath Rangarajan, and Hamilton Slye, Bell Laboratories, Lucent Technologies
Abstract
This paper describes the design, implementation and
performance of a layer-7 switch which supports URL-aware redirection
of HTTP traffic. Currently, there are several vendors who are
beginning to announce the availability of such switches in the market,
but little or no implementation and performance information is
available. We discuss design issues pertaining to such switches
through a prototype implementation of a URL-aware switch in the Linux
kernel, and analyze the performance of our implementation. We
investigate the use of TCP splicing as a mechanism for improving the
performance of the switch; we explore whether TCP splicing will
benefit URL-aware redirection even though HTTP connections, on
average, are short-lived and transfer small amounts of data. Results
from our implementation show that TCP splicing does improve the
performance of URL-aware switches that handle short-lived HTTP
connections. Our results also re-affirm earlier findings that TCP
splicing substantially improves the performance of any
application-layer proxy when large amounts of data are transferred
through the splice.
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