Run the serving and privileged ntpd processes at high priority and the

dns process at normal priority.  Should improve latency on loaded machines.
ok henning@

src/usr.sbin/ntpd/ntp_dns.c

@@ -1,4 +1,4 @@
-/*	$OpenBSD: ntp_dns.c,v 1.4 2013/11/13 20:44:39 benno Exp $ */
+/*	$OpenBSD: ntp_dns.c,v 1.5 2014/02/10 09:12:34 dtucker Exp $ */
 
 /*
  * Copyright (c) 2003-2008 Henning Brauer <henning@openbsd.org>
@@ -17,7 +17,10 @@
  */
 
 #include <sys/param.h>
+#include <sys/resource.h>
 #include <sys/time.h>
+
+#include <err.h>
 #include <errno.h>
 #include <poll.h>
 #include <signal.h>
@@ -61,6 +64,9 @@ ntp_dns(int pipe_ntp[2], struct ntpd_conf *nconf, struct passwd *pw)
 		return (pid);
 	}
 
+	if (setpriority(PRIO_PROCESS, 0, 0) == -1)
+		warn("could not set priority");
+
 	/* in this case the parent didn't init logging and didn't daemonize */
 	if (nconf->settime && !nconf->debug) {
 		log_init(nconf->debug);

src/usr.sbin/ntpd/ntpd.c

@@ -1,4 +1,4 @@
-/*	$OpenBSD: ntpd.c,v 1.78 2014/01/28 22:57:37 sthen Exp $ */
+/*	$OpenBSD: ntpd.c,v 1.79 2014/02/10 09:12:34 dtucker Exp $ */
 
 /*
  * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
@@ -18,6 +18,7 @@
  */
 
 #include <sys/types.h>
+#include <sys/resource.h>
 #include <sys/socket.h>
 #include <sys/wait.h>
 #include <sys/un.h>
@@ -166,6 +167,9 @@ main(int argc, char *argv[])
 	if ((pw = getpwnam(NTPD_USER)) == NULL)
 		errx(1, "unknown user %s", NTPD_USER);
 
+	if (setpriority(PRIO_PROCESS, 0, -20) == -1)
+		warn("can't set priority");
+
 	reset_adjtime();
 	if (!lconf.settime) {
 		log_init(lconf.debug);