--- asterisk-1.6.0-beta1-orig/channels/chan_zap.c	2008-01-18 07:21:26.000000000 +1030
+++ asterisk-1.6.0-beta1/channels/chan_zap.c	2008-01-22 15:33:04.000000000 +1030
@@ -125,6 +125,10 @@
 };
 static struct ast_jb_conf global_jbconf;
 
+extern unsigned int cycles(void);
+
+
+
 #if !defined(ZT_SIG_EM_E1) || (defined(HAVE_PRI) && !defined(ZT_SIG_HARDHDLC))
 #error "Your Zaptel is too old.  Please update"
 #endif
@@ -681,6 +685,9 @@
 #endif	
 	int polarity;
 	int dsp_features;
+	int dsp_cycles_last;            /* DR: stats for DSP execution */
+        int dsp_cycles_worst;
+        int dsp_cycles_average;
 #ifdef HAVE_SS7
 	struct zt_ss7 *ss7;
 	struct isup_call *ss7call;
@@ -5214,6 +5221,7 @@
 	int index;
 	void *readbuf;
 	struct ast_frame *f;
+	int before;
 	
 
 	ast_mutex_lock(&p->lock);
@@ -5459,7 +5467,18 @@
 	}
 	if (p->dsp && (!p->ignoredtmf || p->callwaitcas || p->busydetect  || p->callprogress) && !index) {
 		/* Perform busy detection. etc on the zap line */
+		/* DR: measure some execution stats around this as it is a
+                computationally intensive part of the real time code */
+	        before = cycles();
 		f = ast_dsp_process(ast, p->dsp, &p->subs[index].f);
+		p->dsp_cycles_last = cycles() - before;
+                if (p->dsp_cycles_last > p->dsp_cycles_worst) {
+			p->dsp_cycles_worst = p->dsp_cycles_last;
+		}
+                p->dsp_cycles_average = (int)(0.1*(float)p->dsp_cycles_last + 
+					      0.9*(float)p->dsp_cycles_average);
+
+		//f = 0;
 		if (f) {
 			if ((f->frametype == AST_FRAME_CONTROL) && (f->subclass == AST_CONTROL_BUSY)) {
 				if ((ast->_state == AST_STATE_UP) && !p->outgoing) {
@@ -10318,6 +10337,9 @@
 								pri->pvts[x]->owner->_softhangup |= AST_SOFTHANGUP_DEV;
 							ast_mutex_unlock(&pri->pvts[x]->lock);
 						}
+						pri->pvts[x]->dsp_cycles_last = 0;
+						pri->pvts[x]->dsp_cycles_worst = 0;
+						pri->pvts[x]->dsp_cycles_average = 0;
 				}
 				break;
 			case PRI_EVENT_KEYPAD_DIGIT:
@@ -11615,6 +11637,7 @@
 	return 0;
 }
 
+extern int dsp_sample;
 static char *zap_show_channels(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
 {
 #define FORMAT "%7s %-10.10s %-15.15s %-10.10s %-20.20s %-10.10s %-10.10s\n"
@@ -11868,6 +11891,9 @@
 			else
 				ast_cli(a->fd, "\tnone\n");
 #endif
+			ast_cli(a->fd, "DSP cycles last: %d worst: %d average: %d sample: %d\n", 
+				tmp->dsp_cycles_last, tmp->dsp_cycles_worst, tmp->dsp_cycles_average, dsp_sample);
+
 			if (tmp->master)
 				ast_cli(a->fd, "Master Channel: %d\n", tmp->master->channel);
 			for (x = 0; x < MAX_SLAVES; x++) {
--- asterisk-1.6.0-beta1-orig/main/dsp.c	2008-01-18 07:21:26.000000000 +1030
+++ asterisk-1.6.0-beta1/main/dsp.c	2008-01-22 15:17:37.000000000 +1030
@@ -54,6 +54,27 @@
 #include "asterisk/utils.h"
 #include "asterisk/options.h"
 
+unsigned int cycles(void);
+
+#ifdef __BLACKFIN__
+unsigned int cycles() {
+  int ret;
+
+   __asm__ __volatile__
+   (
+   "%0 = CYCLES;\n\t"
+   : "=&d" (ret)
+   :
+   : "R1"
+   );
+
+   return ret;
+}
+#else
+unsigned int cycles() {}
+#endif
+int dsp_sample;
+
 /*! Number of goertzels for progress detect */
 enum gsamp_size {
 	GSAMP_SIZE_NA = 183,			/*!< North America - 350, 440, 480, 620, 950, 1400, 1800 Hz */
@@ -360,6 +381,9 @@
 	int best_col;
 	int hit;
 	int limit;
+	int before;
+
+	before = cycles();
 
 	hit = 0;
 	for (sample = 0;  sample < samples;  sample = limit) {
@@ -495,6 +519,9 @@
 		s->energy = 0.0;
 		s->current_sample = 0;
 	}
+
+	dsp_sample = cycles() - before;
+
 	return (s->mhit);	/* return the debounced hit */
 }