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  <div class=ctitle>Mod_bandwidth documentation</div><P>
  <div class=ctext>
 
<b class=ctextbold>Installation :</b><P>
WARNING: It is very important to give the lowest priority to mod_bandwidth
so other modules will have the time to do their job before the documents
are transmited ! For that reason, it is important to follow those steps :<P>
<OL> 
<LI> <b class=ctextbold>APACI installation</b><br>
<UL>
     <LI>Copy the file mod_bandwidth.c to your Apache source directory.<br>
     <LI>Run the ./configure script with the following directives : --add-module=mod_bandwidth.c \<br>--permute-module=BEGIN:bandwidth<br>
     <LI>Compile and install Apache.<P>
</UL>
     <b class=ctextbold>Manual installation</b><br>
<UL>
     <LI>Copy the file mod_bandwidth.c to the "src/modules/extra" directory of your Apache sources.<br>
     <LI>Copy the "src/Configuration.tmpl" file to "src/Configuration"<br>
     <LI>Edit the "src/Configuration" file and add near the begining :<br>
       AddModule modules/extra/mod_bandwidth.o<br>
       (This is the reverse of old Apache versions)<br>
     <LI>Run the "./Configure" script<br>
     <LI>Compile and install Apache
</UL>
<P> 
<LI>Create the needed directories and make sure that they are "read/write/execute" for the user under which Apache run. By default, mod_bandwidth use the following directories but they can be changed using the BandWidthDataDir configuration directive:<P>
    /tmp/apachebw<BR>
    /tmp/apachebw/link<br>
    /tmp/apachebw/master<P>
 
 Note that if any of those directories doesn't exist, or if they can't
 be accessed by the server, the module is totaly disabled except for
 logging an error message in the logfile.
<P> 
 Be careful that on some systems the content of the /tmp directory
 is deleted at boot time or every so often by a cronjob. If that the
 case, either disable this feature or change the location of the
 directories used by the module using the BandWidthDataDir configuration directive.
</OL>
<P> 
 <b class=ctextbold>Global configuration directives :</b><P>

 <UL> 
 <LI><b class=ctextbold>BandWidthDataDir</b><br>
    Syntax  : BandWidthDataDir &lt;directory&gt;<br>
    Default : "/tmp/apachebw"<br>
    Context : server config
<P> 
    Sets the name of the root directory used by mod_bandwidth to store
    its internal temporary information. Don't forget to create the needed
    directories : &lt;directory&gt;/master and &lt;directory&gt;/link<P>
<LI><b class=ctextbold>BandWidthModule</b><br>
    Syntax  : BandWidthModule &lt;On|Off&gt;<br>
    Default : Off<br>
    Context : per server config<P>
 
    Enable or disable totaly the whole module. By default, the module is
    disable so it is safe to compile it in the server anyway.
<P> 
    PLEASE, NOTE THAT IF YOU SET A BANDWIDTH LIMIT INSIDE A VIRTUALHOST
    BLOCK, YOU ALSO __NEED__ TO PUT THE "BandWidthModule On" DIRECTIVE
    INSIDE THAT VIRTUALHOST BLOCK !
<P> 
    IF YOU SET BANDWIDTH LIMITS INSIDE DIRECTORY BLOCKS (OUTSIDE OF
    ANY VIRTUALHOST BLOCK), YOU ONLY NEED TO PUT THE "BandWidthModule On"
    DIRECTIVE ONCE, OUTSIDE OF ANY VIRTUALHOST OR DIRECTORY BLOCK.
<P> 
<LI><b class=ctextbold>BandWidthPulse</b><br>
    Syntax  : BandWidthPulse &lt;microseconds&gt;<br>
    Default :<BR>
    Context : per server config<P>
 
    Change the algorithm used to calculate bandwidth and transmit data.
    In normal mode (old mode), the module try to transmit data in packets
    of 1KB. That mean that if the bandwidth available is of 512B, the
    module will transmit 1KB, wait 2 seconds, transmit another 1KB and
    so one.
<P> 
    Seting a value with "BandWidthPulse", will change the algorithm so
    that the server will always wait the same amount of time between
    sending packets but the size of the packets will change.
    The value is in microseconds.
    For example, if you set "BandWidthPulse 1000000" (1 sec) and the
    bandwidth available is of 512B, the sever will transmit 512B,
    wait 1 second, transmit 512B and so on.
<P> 
    The advantage is a smother flow of data. The disadvantage is
    a bigger overhead of data transmited for packet header.
    Setting too small a value (bellow 1/5 of a sec) is not realy
    useful and will put more load on the system and generate more
    traffic for packet header.
<P> 
    Note also that the operating system may do some buffering on
    it's own and so defeat the purpose of setting small values.
<P> 
    This may be very useful on especialy crowded network connection :
    In normal mode, several seconds may happen between the sending of
    a full packet. This may lead to timeout or people may believe that
    the connection is hanging. Seting a value of 1000000 (1 sec) would
    guarantee that some data are sent every seconds...
<P>
</UL> 
<b class=ctextbold>Directory / VirtualServer configuration directives</b><P>
<UL> 
<LI><b class=ctextbold>BandWidth</b><br>
    Syntax  : BandWidth &lt;domain|ip|all&gt; &lt;rate&gt;<br>
    Default : none<BR>
    Context : per directory, .htaccess<P>
 
    Limit the bandwidth for files in this directory and
    sub-directories based on the remote host &lt;domain&gt; or
    &lt;ip&gt; address or for &lt;all&gt; remote hosts.
    <P> 
    Ip addresses may now be specified in the network/mask format.
    (Ie: 192.168.0.0/21 )
    <P> 
    The &lt;rate&gt; is in Bytes/second.
    A &lt;rate&gt; of "0" means no bandwidth limit.
    <P>
    Several BandWidth limits can be set for the same
    directory to set different limits for different
    hosts. In this case, the order of the "BandWidth"
    keywords is important as the module will take the
    first entry which matches the client address.
<P> 
    Example :<br>
       &lt;Directory /home/www&gt;<BR>
       BandWidth ecp.fr 0<BR>
       BandWidth 138.195 0<BR>
       BandWidth all 1024<BR>
       &lt;/Directory&gt;<P>
<P> 
      This will limit the bandwith for directory /home/www and 
      all it's subdirectories to 1024Bytes/sec, except for 
      .ecp.fr or 138.195..where no limit is set.
<P> 
<LI><b class=ctextbold>LargeFileLimit</b><br>
    Syntax  : LargeFileLimit &lt;filesize&gt; &lt;rate&gt;<br>
    Default : none<br>
    Context : per directory, .htaccess<P>
 
    Set a maximal &lt;rate&gt; (in bytes/sec) to use when transfering
    a file of &lt;filesize&gt; KBytes or more.
<P> 
    Several "LargeFileLimit" can be set for various files sizes
    to create range. The rate used for a given file size will be
    the one of the matching range.
 <P>
    A &lt;rate&gt; of "0" mean that there isn't any limit based on
    the size.
<P> 
    A &lt;rate&gt; of "-1" mean that there isn't any limit for that type
    of file. It's override even a BandWidth limit. I found this usefull
    to give priority to very small files (html pages, very small pictures)
    while seting limits for larger files... (users with their video files
    can go to hell ! :)
<P> 
    Example :<BR>
    If the following limits are set :<BR>
       LargeFileLimit 200 3072<BR>
       LargeFileLimit 1024 2048<P>
 
       That's mean that a file of less than 200KBytes won't be
       limited based on his size. A file with a size between
       200KBytes (included) and 1023Kbytes (included) will be
       limited to 3072Bytes/sec and a file of 1024Kbytes or more
       will be limited to 2048Bytes/sec.
<P> 
<LI><b class=ctextbold>MinBandWidth</b><br>
    Syntax  : MinBandWidth &lt;domain|ip|all&gt; &lt;rate&gt;<BR>
    Default : all 256<BR>
    Context : per directory, .htaccess<P>
 
    Set a minimal bandwidth to use for transfering data. This
    over-ride both BandWidth and LargeFileLimit rules as well
    as the calculated rate based on the number of connections.
<P> 
    The first argument is used in the same way as the first
    argument of BandWidth.
<P> 
    &lt;rate&gt; is in bytes per second.
<P> 
    A rate of "0" explicitly means to use the default minimal
    value (256 Bytes/sec).
<P> 
    A rate of "-1" means that the minimal rate is equal to the
    actual rate defined by BandWidth and LargeFileLimit.
    In fact, that means that the final rate won't depend
    of the number of connections but only on what was defined.
<P> 
    Example :<br>
    If BandWidth is set to "3072" (3KBytes/sec) and MinBandWidth
    is set to "1024" (1KBytes/sec) that means :<BR>
       - if there is one connection, the file will be transfered
         at 3072 Bytes/sec.<BR>
       - if there is two connections, each files will be transfered
         at 1536 Bytes/sec.<BR>
       - if there is three or more connections, each files will be
         transfered at 1024 Bytes/sec. (Minimal of 1024 Bytes/sec).
<P> 
    If MinBandWidth is set to "-1" that means :<BR>
       - if there is one connection, the file will be transfered
         at 3072 Bytes/sec.<BR>
       - if there is two or more connections, each files will be
         transfered at 3072 Bytes/sec. In effect, the rate doesn't
         depend anymore on the number of connections but only on
         the configuration values.
<P> 
    Note that the total transfer rate will never exceed your physical
    bandwidth limitation.
<P> 
 Note : If both a "BandWidth" and a "LargeFileLimit" limit apply,
        the lowest one will be used. (But never lower than the
        "MinBandWidth" rate)
<P> 
        If both a virtual server limit is defined and another
        apply for a directory under this virtual server, the
        directory limit will over-ride it.
 <P>
        If a limit is defined outside a Directory or VirtualHost
        directive, it will act as default on a per virtual server
        basis. (Ie: each virtual server will have that limit,
        _independantly_ of the other servers)
</UL>
<P>
<B class=ctextbold>Runing Apache with mod_bandwidth :</B><P>
For correct results, it is important that there isn't any "dead" links in
the "link" directory of mod_bandwidth when you start the server.<P>
It may be a good idee to run the "cleanlink.pl" script we provide to
automaticaly remove dead links<br>
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