/a></dt><dd><p>
         Specifies the delay between activity rounds for the
         background writer.  In each round the writer issues writes
         for some number of dirty buffers (controllable by the
         following parameters).  It then sleeps for
         the length of <code class="varname">bgwriter_delay</code>, and repeats.
         When there are no dirty buffers in the
         buffer pool, though, it goes into a longer sleep regardless of
         <code class="varname">bgwriter_delay</code