diff --git a/configure.ac b/configure.ac
index 0d92d3d081..78e46903cc 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1407,20 +1407,6 @@ AC_ARG_ENABLE([leak-detection],
 AS_CASE([$enable_leak_detection],
 	[yes],[AC_DEFINE([ENABLE_LEAK_DETECTION], [1], [Define to enable memory leak detection in external libraries])])
 
-#
-# was --with-tuning specified?
-#
-# [pairwise: --with-tuning=small, --without-tuning]
-AC_ARG_WITH([tuning],
-	    AS_HELP_STRING([--with-tuning=ARG],
-			   [Specify server tuning (default or small)]),
-	    [],[with_tuning=no])
-
-AS_CASE([$with_tuning],
-	[small],[AC_MSG_NOTICE(using small system tuning)],
-	[AC_DEFINE(TUNE_LARGE, 1, [Define to use default system tuning.])
-	 AC_MSG_NOTICE(using default system tuning)])
-
 #
 # was --enable-querytrace or --enable-singletrace specified?
 #
@@ -1674,7 +1660,6 @@ report() {
     if test "yes" = "$enable_full_report" -o "standard" = "$with_locktype"; then
 	echo "    Mutex lock type: $with_locktype"
     fi
-    test "small" = "$with_tuning" && echo "    Small-system tuning (--with-tuning)"
     test "no" = "$enable_dnstap" || \
 	    echo "    Allow 'dnstap' packet logging (--enable-dnstap)"
     test -z "$MAXMINDDB_LIBS" || echo "    GeoIP2 access control (--enable-geoip)"
@@ -1719,7 +1704,6 @@ report() {
       echo "    +------------------------------------------+"
       echo
     fi
-    test "small" = "$with_tuning" || echo "    Small-system tuning (--with-tuning)"
 
     test "no" = "$enable_dnstap" && \
 	    echo "    Allow 'dnstap' packet logging (--enable-dnstap)"
diff --git a/lib/ns/interfacemgr.c b/lib/ns/interfacemgr.c
index dce611b92d..fcec91e489 100644
--- a/lib/ns/interfacemgr.c
+++ b/lib/ns/interfacemgr.c
@@ -56,12 +56,6 @@
 
 #define LISTENING(ifp) (((ifp)->flags & NS_INTERFACEFLAG_LISTENING) != 0)
 
-#ifdef TUNE_LARGE
-#define UDPBUFFERS 32768
-#else /* ifdef TUNE_LARGE */
-#define UDPBUFFERS 1000
-#endif /* TUNE_LARGE */
-
 #define IFMGR_MAGIC		 ISC_MAGIC('I', 'F', 'M', 'G')
 #define NS_INTERFACEMGR_VALID(t) ISC_MAGIC_VALID(t, IFMGR_MAGIC)