diff --git a/usr.sbin/powerd/powerd.8 b/usr.sbin/powerd/powerd.8
--- a/usr.sbin/powerd/powerd.8
+++ b/usr.sbin/powerd/powerd.8
@@ -43,6 +43,8 @@
 .Op Fl p Ar ival
 .Op Fl r Ar percent
 .Op Fl s Ar source
+.Op Fl S
+.Op Fl t
 .Op Fl v
 .Sh DESCRIPTION
 The
@@ -129,6 +131,17 @@
 and
 .Cm apm
 (i386 only).
+.It Fl S
+Scales load to 100% no matter how many cores are present in the system.
+Without this flag, powerd will keep the clock speed elevated on
+systems with a high core count if a small number of cores are busy.
+Note that this option will keep the CPU clock speed low on systems
+with serial workloads.
+.It Fl t
+Forbid turbo.
+Some CPUs enter "turbo" mode and allow higher clocking when a freqency
+whose least significant digit is one are selected.
+This flag prevents selection of "turbo" frequencies.
 .It Fl v
 Verbose mode.
 Messages about power changes will be printed to stdout and
diff --git a/usr.sbin/powerd/powerd.c b/usr.sbin/powerd/powerd.c
--- a/usr.sbin/powerd/powerd.c
+++ b/usr.sbin/powerd/powerd.c
@@ -86,9 +86,9 @@
 #define DEVDPIPE	"/var/run/devd.pipe"
 #define DEVCTL_MAXBUF	1024
 
-static int	read_usage_times(int *load, int nonice);
+static int	read_usage_times(int *load, int nonice, int scale);
 static int	read_freqs(int *numfreqs, int **freqs, int **power,
-		    int minfreq, int maxfreq);
+		    int minfreq, int maxfreq, int turbo);
 static int	set_freq(int freq);
 static void	acline_init(void);
 static void	acline_read(void);
@@ -140,7 +140,7 @@
  * nice time will be treated as if idle.
  */
 static int
-read_usage_times(int *load, int nonice)
+read_usage_times(int *load, int nonice, int scale)
 {
 	static long *cp_times = NULL, *cp_times_old = NULL;
 	static int ncpus = 0;
@@ -184,6 +184,8 @@
 				    cp_times_old[cpu * CPUSTATES + CP_NICE];
 			*load += 100 - excl * 100 / total;
 		}
+		if (scale)
+			*load = *load / ncpus;
 	}
 
 	memcpy(cp_times_old, cp_times, cp_times_len);
@@ -192,7 +194,8 @@
 }
 
 static int
-read_freqs(int *numfreqs, int **freqs, int **power, int minfreq, int maxfreq)
+read_freqs(int *numfreqs, int **freqs, int **power, int minfreq,
+    int maxfreq, int turbo)
 {
 	char *freqstr, *p, *q;
 	int i, j;
@@ -231,7 +234,10 @@
 			free(*power);
 			return (-1);
 		}
-		if (((*freqs)[j] >= minfreq || minfreq == -1) &&
+		/* Turbo freq is 1st freq, and 1Mhz hihger than 2nd */
+		if (!turbo && j == 1 && (*freqs)[0] == (*freqs)[1] + 1)
+		    (*freqs)[0] = (*freqs)[1];
+		else if (((*freqs)[j] >= minfreq || minfreq == -1) &&
 		    ((*freqs)[j] <= maxfreq || maxfreq == -1))
 			j++;
 		p = q + 1;
@@ -479,7 +485,7 @@
 {
 
 	fprintf(stderr,
-"usage: powerd [-v] [-a mode] [-b mode] [-i %%] [-m freq] [-M freq] [-N] [-n mode] [-p ival] [-r %%] [-s source] [-P pidfile]\n");
+"usage: powerd [-v] [-S] [-t] [-a mode] [-b mode] [-i %%] [-m freq] [-M freq] [-N] [-n mode] [-p ival] [-r %%] [-s source] [-P pidfile]\n");
 	exit(1);
 }
 
@@ -496,7 +502,7 @@
 	int ch, mode, mode_ac, mode_battery, mode_none, idle, to;
 	uint64_t mjoules_used;
 	size_t len;
-	int nonice;
+	int nonice, scale, turbo;
 
 	/* Default mode for all AC states is adaptive. */
 	mode_ac = mode_none = MODE_HIADAPTIVE;
@@ -507,12 +513,14 @@
 	mjoules_used = 0;
 	vflag = 0;
 	nonice = 0;
+	turbo = 1;
+	scale = 0;
 
 	/* User must be root to control frequencies. */
 	if (geteuid() != 0)
 		errx(1, "must be root to run");
 
-	while ((ch = getopt(argc, argv, "a:b:i:m:M:Nn:p:P:r:s:v")) != -1)
+	while ((ch = getopt(argc, argv, "a:b:i:m:M:Nn:p:P:r:s:Stv")) != -1)
 		switch (ch) {
 		case 'a':
 			parse_mode(optarg, &mode_ac, ch);
@@ -571,6 +579,12 @@
 				usage();
 			}
 			break;
+		case 'S':
+			scale = 1;
+			break;
+		case 't':
+			turbo = 0;
+			break;
 		case 'v':
 			vflag = 1;
 			break;
@@ -595,9 +609,9 @@
 		err(1, "lookup freq_levels");
 
 	/* Check if we can read the load and supported freqs. */
-	if (read_usage_times(NULL, nonice))
+	if (read_usage_times(NULL, nonice, scale))
 		err(1, "read_usage_times");
-	if (read_freqs(&numfreqs, &freqs, &mwatts, minfreq, maxfreq))
+	if (read_freqs(&numfreqs, &freqs, &mwatts, minfreq, maxfreq, turbo))
 		err(1, "error reading supported CPU frequencies");
 	if (numfreqs == 0)
 		errx(1, "no CPU frequencies in user-specified range");
@@ -777,7 +791,7 @@
 		}
 
 		/* Adaptive mode; get the current CPU usage times. */
-		if (read_usage_times(&load, nonice)) {
+		if (read_usage_times(&load, nonice, scale)) {
 			if (vflag)
 				warn("read_usage_times() failed");
 			continue;