SPECweb99 Tuning Options Disclosure for AIX 4.3.3
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Network Options (no) tuning:
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send_file_duration = 180000
  Specifies the cache validation duration for all the file objects that
  system call send_file accessed in the Network Buffer Cache. This
  attribute is in number of seconds; the default is 300 (5 minutes). A
  value of 0 means that the cache will be validated for every access.

sb_max = 262144
  Specifies the maximum buffer size allowed for a socket. The default
  is 65,536 bytes.

somaxconn = 8192
  Specifies the maximum listen backlog. The default is 1024 bytes.

nbc_max_cache = 131072
  Specifies the maximum size of a cache object allowed in the Network
  Buffer Cache, in bytes. The default is 1048576 (1024K) bytes. Data objects
  bigger than this size won't be put in the NBC. 

nbc_pseg = 20000
  The maximum number of file entries in the private segment.  The default
  is 0.

tcp_timewait = 5
  The tcp_timewait option is used to configure how long connections are
  kept in the timewait state. It is given in 15 second intervals, and the
  default is 1.

delayack = 3

  Delays ACKs for certain TCP packets and attempts to piggyback them with
  the next packet sent instead.  This will only be performed for
  connections whose destination port is specified in the list of the
  delayackports attribute.  This can be used to increase performance when
  communicating with an HTTP server.  The attribute can have one of four
  values: 

  0  No delays; normal operation 
  1  Delay the ACK for the server's SYN 
  2  Delay the ACK for the server's FIN 
  3  Delay both the ACKs for the SYN and FIN

delayackports = {80}

  Specifies the list of destination ports for which the operation defined
  by the delayack port option will be performed.  The attribute takes a
  list of up to ten ports, separated by commas and enclosed in curly
  braces.  To clear the list set the option to {}.

Zeus 3.1.8
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For details on the Zeus tuning parameters used please see:

http://support.zeus.co.uk/faq/entries/tuning.html#31