Performance Interactions Between P-HTTP and
TCP Implementations
John Heidemann
USC/Information Sciences Institute
Citation
John Heidemann. Performance Interactions Between P-HTTP and TCP Implementations. [PDF] [alt PDF]
Abstract
This document describes several performance problems resulting from interactions between implementations of persistent-HTTP (P-HTTP) and TCP. Two of these problems tie P-HTTP performance to TCP delayed-acknowledgments, thus adding up to 200ms to each P-HTTP transaction. A third results in multiple slow-starts per TCP connection. Unresolved, these problems result in P-HTTP transactions which are 14 times slower than standard HTTP and 20 times slower than potential P-HTTP over a 10 Mb/s Ethernet. We describe each problem and potential solutions. After implementing our solutions to two of the problems, we observe that P-HTTP performs better than HTTP on a local Ethernet. Although we observed these problems in specific implementations of HTTP and TCP (Apache-1.1b4 and SunOS 4.1.3, respectively), we believe that these problems occur more widely.Bibtex Citation
@unpublished{Heidemann96b,
author = {Heidemann, John},
title = {Performance Interactions Between {P-HTTP} and
{TCP} Implementations},
note = {Released as web page
\url{https://ant.isi.edu/lsam/publications/phttp_tcp_interactions/}; submitted to ACM Computer Communications Review,
reference superseded by [Heidemann97a]},
year = {1996},
sortdate = {1996-07-01},
project = {lsam},
jsubject = {www},
month = jul,
jlocation = {johnh: folder: lsam},
keywords = {http, apache, bsd-tcp},
url = {https://ant.isi.edu/%7ejohnh/PAPERS/Heidemann96b.html},
psurl = {https://ant.isi.edu/%7ejohnh/PAPERS/Heidemann96b.ps.gz},
pdfurl = {https://ant.isi.edu/%7ejohnh/PAPERS/Heidemann96b.pdf},
myorganization = {USC/Information Sciences Institute},
copyrightholder = {authors}
}