@@ -1322,12 +1322,14 @@ SET ENABLE_SEQSCAN TO OFF;
13221322 background writer. In each round the writer issues writes
13231323 for some number of dirty buffers (controllable by the
13241324 following parameters). It then sleeps for <varname>bgwriter_delay</>
1325- milliseconds, and repeats. The default value is 200 milliseconds
1326- (<literal>200ms</>). Note that on many systems, the effective
1327- resolution of sleep delays is 10 milliseconds; setting
1328- <varname>bgwriter_delay</> to a value that is not a multiple of
1329- 10 might have the same results as setting it to the next higher
1330- multiple of 10. This parameter can only be set in the
1325+ milliseconds, and repeats. When there are no dirty buffers in the
1326+ buffer pool, though, it goes into a longer sleep regardless of
1327+ <varname>bgwriter_delay</>. The default value is 200
1328+ milliseconds (<literal>200ms</>). Note that on many systems, the
1329+ effective resolution of sleep delays is 10 milliseconds; setting
1330+ <varname>bgwriter_delay</> to a value that is not a multiple of 10
1331+ might have the same results as setting it to the next higher multiple
1332+ of 10. This parameter can only be set in the
13311333 <filename>postgresql.conf</> file or on the server command line.
13321334 </para>
13331335 </listitem>