readahead: use 20K instead of 16K as temporary request nr bump

TODO

@@ -53,6 +53,8 @@ Bugfixes:
 
 Features:
 
++ refuse automount triggers when automount is queued for stop, much like we refuse socket triggers when sockets are queued for stop
+
 * perfomance messages for selinux are gone from debug log?
 
 * http://lists.freedesktop.org/archives/systemd-devel/2012-September/006502.html

src/readahead/readahead-common.c

@@ -214,7 +214,11 @@ finish:
         return m;
 }
 
-#define BUMP_REQUEST_NR (16*1024)
+/* We use 20K instead of the more human digestable 16K here. Why?
+   Simply so that it is more unlikely that users end up picking this
+   value too so that we can recognize better whether the user changed
+   the value while we had it temporarily bumped. */
+#define BUMP_REQUEST_NR (20*1024)
 
 int block_bump_request_nr(const char *p) {
         struct stat st;