[v9_9] add fetchlimit to README

diff --git a/README b/README
index d3df48d3130f3293963d23f6d207bf433f9161c7..65a1872fa1392b0717e66ffda24412a61aadabeb 100644 (file)
--- a/README
+++ b/README
@@ -55,7 +55,29 @@ BIND 9.9.8
 
        BIND 9.9.8 is a maintenance release and addresses bugs
        found in BIND 9.9.7 and earlier, as well as the security
-       flaws described in CVE-2015-4620 and CVE-2015-5477.
+       flaws described in CVE-2015-4620 and CVE-2015-5477. It also
+        makes the following new features available via a compile
+        time option:
+
+       - New "fetchlimit" quotas are now available for the use of
+         recursive resolvers that are are under high query load for
+         domains whose authoritative servers are nonresponsive or are
+         experiencing a denial of service attack.
+
+         + "fetches-per-server" limits the number of simultaneous queries
+           that can be sent to any single authoritative server.  The
+           configured value is a starting point; it is automatically
+           adjusted downward if the server is partially or completely
+           non-responsive. The algorithm used to adjust the quota can be
+           configured via the "fetch-quota-params" option.
+         + "fetches-per-zone" limits the number of simultaneous queries
+           that can be sent for names within a single domain.  (Note:
+           Unlike "fetches-per-server", this value is not self-tuning.)
+          + New stats counters have been added to count
+           queries spilled due to these quotas.
+
+          NOTE: These options are NOT built in by default; use
+          "configure --enable-fetchlimit" to enable them.
 
 BIND 9.9.7