Add an option to dial the frequency estimation interval.

Signed-off-by: Richard Cochran <richardcochran@gmail.com>

config.c

@@ -193,6 +193,11 @@ static void scan_global_line(const char *s, struct config *cfg)
 
 		dds->free_running = val ? 1 : 0;
 
+	} else if (1 == sscanf(s, " freq_est_interval %d", &val)) {
+
+		if (val >= 0)
+			dds->freq_est_interval = val;
+
 	} else if (1 == sscanf(s, " assume_two_step %u", &val)) {
 
 		*cfg->assume_two_step = val ? 1 : 0;

default.cfg

@@ -11,6 +11,7 @@ clockClass		248
 clockAccuracy		0xFE
 offsetScaledLogVariance	0xFFFF
 free_running		0
+freq_est_interval	1
 #
 # Port Data Set
 #

ds.h

@@ -34,6 +34,7 @@ struct defaultDS {
 	struct ClockIdentity clockIdentity;
 	UInteger8            domainNumber;
 	int                  free_running;
+	int                  freq_est_interval; /*log seconds*/
 };
 
 struct dataset {

gPTP.cfg

@@ -11,6 +11,7 @@ clockClass		248
 clockAccuracy		0xFE
 offsetScaledLogVariance	0xFFFF
 free_running		0
+freq_est_interval	1
 #
 # Port Data Set
 #

ptp4l.c

@@ -44,6 +44,7 @@ static struct config cfg_settings = {
 		.clockQuality.clockAccuracy = 0xfe,
 		.clockQuality.offsetScaledLogVariance = 0xffff,
 		.priority2 = 128,
+		.freq_est_interval = 1,
 	},
 
 	.pod = {