--- a/bin/named/logconf.c
+++ b/bin/named/logconf.c
@@ -181,10 +181,12 @@
 		const cfg_obj_t *printcat = NULL;
 		const cfg_obj_t *printsev = NULL;
 		const cfg_obj_t *printtime = NULL;
+		const cfg_obj_t *buffered = NULL;
 
 		(void)cfg_map_get(channel, "print-category", &printcat);
 		(void)cfg_map_get(channel, "print-severity", &printsev);
 		(void)cfg_map_get(channel, "print-time", &printtime);
+		(void)cfg_map_get(channel, "buffered", &buffered);
 
 		if (printcat != NULL && cfg_obj_asboolean(printcat))
 			flags |= ISC_LOG_PRINTCATEGORY;
@@ -192,6 +194,8 @@
 			flags |= ISC_LOG_PRINTTIME;
 		if (printsev != NULL && cfg_obj_asboolean(printsev))
 			flags |= ISC_LOG_PRINTLEVEL;
+		if (buffered != NULL && cfg_obj_asboolean(buffered))
+			flags |= ISC_LOG_BUFFERED;
 	}
 
 	level = ISC_LOG_INFO;
--- a/lib/isc/include/isc/log.h
+++ b/lib/isc/include/isc/log.h
@@ -69,6 +69,7 @@
 #define ISC_LOG_PRINTMODULE	0x0008
 #define ISC_LOG_PRINTTAG	0x0010
 #define ISC_LOG_PRINTALL	0x001F
+#define ISC_LOG_BUFFERED        0x0020
 #define ISC_LOG_DEBUGONLY	0x1000
 #define ISC_LOG_OPENERR		0x8000		/* internal */
 /*@}*/
--- a/lib/isc/log.c
+++ b/lib/isc/log.c
@@ -714,7 +714,8 @@
 	REQUIRE(destination != NULL || type == ISC_LOG_TONULL);
 	REQUIRE(level >= ISC_LOG_CRITICAL);
 	REQUIRE((flags &
-		 (unsigned int)~(ISC_LOG_PRINTALL | ISC_LOG_DEBUGONLY)) == 0);
+		 (unsigned int)~(ISC_LOG_PRINTALL | ISC_LOG_DEBUGONLY
+				 | ISC_LOG_BUFFERED)) == 0);
 
 	/* XXXDCL find duplicate names? */
 
@@ -1413,7 +1414,7 @@
 	struct stat statbuf;
 	isc_boolean_t matched = ISC_FALSE;
 	isc_boolean_t printtime, printtag;
-	isc_boolean_t printcategory, printmodule, printlevel;
+	isc_boolean_t printcategory, printmodule, printlevel, buffered;
 	isc_logconfig_t *lcfg;
 	isc_logchannel_t *channel;
 	isc_logchannellist_t *category_channels;
@@ -1648,6 +1649,8 @@
 				       != 0);
 		printlevel    = ISC_TF((channel->flags & ISC_LOG_PRINTLEVEL)
 				       != 0);
+		buffered      = ISC_TF((channel->flags & ISC_LOG_BUFFERED)
+				       != 0);
 
 		switch (channel->type) {
 		case ISC_LOG_TOFILE:
@@ -1708,7 +1711,9 @@
 				printlevel    ? level_string	: "",
 				lctx->buffer);
 
-			fflush(FILE_STREAM(channel));
+			if (buffered != ISC_TRUE) {
+			  fflush(FILE_STREAM(channel));
+			}
 
 			/*
 			 * If the file now exceeds its maximum size
--- a/lib/isccfg/namedconf.c
+++ b/lib/isccfg/namedconf.c
@@ -1594,6 +1594,7 @@
 	{ "print-time", &cfg_type_boolean, 0 },
 	{ "print-severity", &cfg_type_boolean, 0 },
 	{ "print-category", &cfg_type_boolean, 0 },
+	{ "buffered", &cfg_type_boolean, 0 },
 	{ NULL, NULL, 0 }
 };
 static cfg_clausedef_t *