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From "Peter Jones (JIRA)" <j...@apache.org>
Subject [jira] Created: (RIVER-141) default mux maxFragmentSize has significant impact on Kerberos performance
Date Fri, 27 Jul 2007 21:57:52 GMT
default mux maxFragmentSize has significant impact on Kerberos performance
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                 Key: RIVER-141
                 URL: https://issues.apache.org/jira/browse/RIVER-141
             Project: River
          Issue Type: Improvement
          Components: net_jini_jeri
    Affects Versions: jtsk_2.0
            Reporter: Peter Jones
            Priority: Minor


Bugtraq ID [4851548|http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4851548]

The default 1Kb {{maxFragmentSize}} in {{MuxClient}} and {{MuxServer}} appears to have a significant
impact on Kerberos performance. In a timed experiment in starting up activatable versions
of all of our services, with Kerberos configured for everything, the start up time went from
~800 seconds to ~488 seconds when the {{maxFragmentSize}} was changed from 1Kb to 8Kb and
the {{bufSize}} in {{KerberosUtil.ConnectionOutputStream}} was changed from 8000 to 8224.
Start up time for an equivalent SSL setup appeared to be essentially unchanged.

h4. (Evaluation note:)

OK.  I believe that the current 1KB values were chosen (somewhat whimsically) based on what
seemed to be not so large as to cause breakup of a fragment (and a reasonable number of headers)
into multiple segments with our local systems and network configuration.  Clearly, an intervening
encryption layer can make other performance considerations dominate.

h4. (Comments note:)

Hmm, hold the fort. The timing in the original description was done with JDK 1.4.1. Using
1.4.2 beta, to first order the change doesn't seem to cause a significant improvement: the
total time has decreased to ~50 seconds due to JDK improvements, and the buffering change
might at most shave off a second or two.

h4. (Evaluation note:)

The performance impact of the default {{maxFragmentSize}} should be investigated in more detail
post-2.0.


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