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From Dean Gaudet <>
Subject cvs commit: apache/htdocs/manual new_features_1_3.html
Date Fri, 08 Aug 1997 11:28:33 GMT
dgaudet     97/08/08 04:28:33

  Modified:    htdocs/manual new_features_1_3.html
  Add a few of the things I worked on.
  Revision  Changes    Path
  1.13      +51 -1     apache/htdocs/manual/new_features_1_3.html
  Index: new_features_1_3.html
  RCS file: /export/home/cvs/apache/htdocs/manual/new_features_1_3.html,v
  retrieving revision 1.12
  retrieving revision 1.13
  diff -u -r1.12 -r1.13
  --- new_features_1_3.html	1997/07/30 20:08:14	1.12
  +++ new_features_1_3.html	1997/08/08 11:28:32	1.13
  @@ -138,7 +138,21 @@
       directive now defaults to "Off". This means that, unless explictly
       was done to spare the Internet from unneccessary DNS traffic.
  +<li><strong>Double-Reverse DNS enforced</strong><br>
  +    The <a href="mod/core.html#hostnamelookups">HostnameLookups</a> directive
  +    now supports double-reverse DNS.  (Known as <i>PARANOID</i> in the
  +    terminology of tcp_wrappers.)  An IP address passes a double-reverse
  +    DNS test if the forward map of the reverse map includes the original
  +    IP.  Regardless of the HostnameLookups setting,
  +    <a href="mod/mod_access.html">mod_access</a> access lists using DNS
  +    names <b>require</b> all names to pass a double-reverse DNS test.
  +<li><strong>CIDR and Netmask access control</strong><br>
  +    <a href="mod/mod_access.html">mod_access</a> directives now support
  +    CIDR (Classless Inter-Domain Routing) style prefixes, and netmasks for
  +    greater control over IP access lists.
   <li><strong>New child_init function for module API</strong><br>
  @@ -152,6 +166,42 @@
   <li><strong><a href="mod/mod_info.html#addmoduleinfo">AddModuleInfo</a>
   directive added to <a href="mod/mod_info.html">mod_info</a></strong><br>
   Allows additional information to be listed along with a specified module.
  +<li><strong>Performance Improvements</strong>
  +    <ul>
  +    <li>IP-based virtual hosts are looked up via hash table,
  +	giving a performance boost on servers with large numbers of vhosts.
  +    <li>&lt;Directory&gt; parsing of requests has been vastly improved, giving
  +	speedups on configs with a lot of sections.
  +    <li>The critical path for static requests has fewer system calls.  This
  +	generally helps all requests.  (45 syscalls for a static request
  +	in 1.2 versus 29 in 1.3).
  +    <li><a href="mod/mod_proxy.html#ReceiveBufferSize">ReceiveBufferSize</a>
  +	directive gives mod_proxy's outgoing connections larger network
  +	buffers, for increased throughput.
  +    <li>The low level i/o routines use <code>writev</code> (where available)
  +	to issue multiple writes with a single system call.  They also avoid
  +	copying memory into buffers as much as possible.  The result is
  +	less CPU time spent on transferring large files.
  +    <li><i>XXX Incomplete:</i> Static requests are served using
  +	<code>mmap</code>, which means bytes are only copied from the
  +	disk buffer to the network buffer directly by the kernel.  The
  +	program never copies bytes around, which reduces CPU time.
  +    <li>When presented with a load spike, the server quickly adapts by
  +	spawning children at faster rates.
  +    <li>The code which dispatches modules was optimized to avoid repeatedly
  +	skipping over modules that don't implement certain phases of the
  +	API.  (This skipping showed up as 5% of the cpu time on profiles of
  +	a server with the default module mix.)
  +    <li>Revamp of the Unix scoreboard management code so that less time is
  +	spent counting children in various states.  Previously a scan was
  +	performed for each hit, now it is performed only once per second.
  +	This should be noticeable on servers running with hundreds of
  +	children and high loads.
  +    <li><i>XXX Incomplete:</i> New serialization choices improve performance
  +	on Linux, Solaris, and IRIX.
  +    </ul>

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