diff --git a/tools/power/x86/turbostat/turbostat.8 b/tools/power/x86/turbostat/turbostat.8
index 8e7b29af..0fc7a11 100644
--- a/tools/power/x86/turbostat/turbostat.8
+++ b/tools/power/x86/turbostat/turbostat.8
@@ -4,17 +4,11 @@ turbostat \- Report processor frequency and idle statistics
 .SH SYNOPSIS
 .ft B
 .B turbostat
-.RB [ "\-s" ]
-.RB [ "\-v" ]
-.RB [ "\-m MSR#" ]
-.RB [ "\-M MSR#" ]
+.RB [ Options ]
 .RB command
 .br
 .B turbostat
-.RB [ "\-s" ]
-.RB [ "\-v" ]
-.RB [ "\-m MSR#" ]
-.RB [ "\-M MSR#" ]
+.RB [ Options ]
 .RB [ "\-i interval_sec" ]
 .SH DESCRIPTION
 \fBturbostat \fP reports processor topology, frequency
@@ -37,11 +31,13 @@ The \fB-p\fP option limits output to the 1st thread in each package.
 .PP
 The \fB-v\fP option increases verbosity.
 .PP
-The \fB-m MSR#\fP option dumps the specified 32-bit MSR,
-in addition to the usual frequency and idle statistics.
+The \fB-d MSR#\fP option includes the delta of the specified 32-bit MSR counter.
 .PP
-The \fB-M MSR#\fP option dumps the specified 64-bit MSR,
-in addition to the usual frequency and idle statistics.
+The \fB-D MSR#\fP option includes the delta of the specified 64-bit MSR counter.
+.PP
+The \fB-m MSR#\fP option includes the the specified 32-bit MSR value.
+.PP
+The \fB-M MSR#\fP option includes the the specified 64-bit MSR value.
 .PP
 The \fB-i interval_sec\fP option prints statistics every \fiinterval_sec\fP seconds.
 The default is 5 seconds.
@@ -155,6 +151,29 @@ Note that turbostat reports average GHz of 3.63, while
 the arithmetic average of the GHz column above is lower.
 This is a weighted average, where the weight is %c0.  ie. it is the total number of
 un-halted cycles elapsed per time divided by the number of CPUs.
+.SH SMI COUNTING EXAMPLE
+On Intel Nehalem and newer processors, MSR 0x34 is a System Management Mode Interrupt (SMI) counter.
+Using the -m option, you can display how many SMIs have fired since reset, or if there
+are SMIs during the measurement interval, you can display the delta using the -d option.
+.nf
+[root@x980 ~]# turbostat -m 0x34
+cor CPU    %c0  GHz  TSC   MSR 0x034    %c1    %c3    %c6   %pc3   %pc6
+          1.41 1.82 3.38  0x00000000   8.92  37.82  51.85  17.37   0.55
+  0   0   3.73 2.03 3.38  0x00000055   1.72  48.25  46.31  17.38   0.55
+  0   6   0.14 1.63 3.38  0x00000056   5.30
+  1   2   2.51 1.80 3.38  0x00000056  15.65  29.33  52.52
+  1   8   0.10 1.65 3.38  0x00000056  18.05
+  2   4   1.16 1.68 3.38  0x00000056   5.87  24.47  68.50
+  2  10   0.10 1.63 3.38  0x00000056   6.93
+  8   1   3.84 1.91 3.38  0x00000056   1.36  50.65  44.16
+  8   7   0.08 1.64 3.38  0x00000056   5.12
+  9   3   1.82 1.73 3.38  0x00000056   7.59  24.21  66.38
+  9   9   0.09 1.68 3.38  0x00000056   9.32
+ 10   5   1.66 1.65 3.38  0x00000056  15.10  50.00  33.23
+ 10  11   1.72 1.65 3.38  0x00000056  15.05
+^C
+[root@x980 ~]# 
+.fi
 .SH NOTES
 
 .B "turbostat "
diff --git a/tools/power/x86/turbostat/turbostat.c b/tools/power/x86/turbostat/turbostat.c
index 946e9ab..e38976c 100644
--- a/tools/power/x86/turbostat/turbostat.c
+++ b/tools/power/x86/turbostat/turbostat.c
@@ -65,6 +65,8 @@ unsigned int do_nehalem_turbo_ratio_limit;
 unsigned int do_ivt_turbo_ratio_limit;
 unsigned int extra_msr_offset32;
 unsigned int extra_msr_offset64;
+unsigned int extra_delta_offset32;
+unsigned int extra_delta_offset64;
 double bclk;
 unsigned int show_pkg;
 unsigned int show_core;
@@ -86,7 +88,9 @@ struct thread_data {
 	unsigned long long mperf;
 	unsigned long long c1;	/* derived */
 	unsigned long long extra_msr64;
-	unsigned int extra_msr32;
+	unsigned long long extra_delta64;
+	unsigned long long extra_msr32;
+	unsigned long long extra_delta32;
 	unsigned int cpu_id;
 	unsigned int flags;
 #define CPU_IS_FIRST_THREAD_IN_CORE	0x2
@@ -208,24 +212,6 @@ int get_msr(int cpu, off_t offset, unsigned long long *msr)
 	return 0;
 }
 
-/*
- * Truncate the 8 bytes we read from /dev/cpu/.../msr
- * to the 4 bytes requested
- */
-
-int get_msr32(int cpu, off_t offset, unsigned int *msr)
-{
-	int retval;
-
-	unsigned long long msr64;
-
-	retval = get_msr(cpu, offset, &msr64);
-	*msr = (unsigned int) msr64;
-
-	return retval;
-}
-
-
 void print_header(void)
 {
 	if (show_pkg)
@@ -243,10 +229,14 @@ void print_header(void)
 	if (has_aperf)
 		outp += sprintf(outp, "  GHz");
 	outp += sprintf(outp, "  TSC");
+	if (extra_delta_offset32)
+		outp += sprintf(outp, "  delta 0x%03X", extra_delta_offset32);
+	if (extra_delta_offset64)
+		outp += sprintf(outp, "  DELTA 0x%03X", extra_delta_offset64);
 	if (extra_msr_offset32)
-		outp += sprintf(outp, "  MSR 0x%04X", extra_msr_offset32);
+		outp += sprintf(outp, "   MSR 0x%03X", extra_msr_offset32);
 	if (extra_msr_offset64)
-		outp += sprintf(outp, "          MSR 0x%04X", extra_msr_offset64);
+		outp += sprintf(outp, "           MSR 0x%03X", extra_msr_offset64);
 	if (do_nhm_cstates)
 		outp += sprintf(outp, "    %%c1");
 	if (do_nhm_cstates)
@@ -278,7 +268,11 @@ int dump_counters(struct thread_data *t, struct core_data *c,
 		fprintf(stderr, "aperf: %016llX\n", t->aperf);
 		fprintf(stderr, "mperf: %016llX\n", t->mperf);
 		fprintf(stderr, "c1: %016llX\n", t->c1);
-		fprintf(stderr, "msr0x%x: %08X\n",
+		fprintf(stderr, "msr0x%x: %08llX\n",
+			extra_delta_offset32, t->extra_delta32);
+		fprintf(stderr, "msr0x%x: %016llX\n",
+			extra_delta_offset64, t->extra_delta64);
+		fprintf(stderr, "msr0x%x: %08llX\n",
 			extra_msr_offset32, t->extra_msr32);
 		fprintf(stderr, "msr0x%x: %016llX\n",
 			extra_msr_offset64, t->extra_msr64);
@@ -385,9 +379,16 @@ int format_counters(struct thread_data *t, struct core_data *c,
 	/* TSC */
 	outp += sprintf(outp, "%5.2f", 1.0 * t->tsc/units/interval_float);
 
+	/* delta */
+	if (extra_delta_offset32)
+		outp += sprintf(outp, "  %11llu", t->extra_delta32);
+
+	/* DELTA */
+	if (extra_delta_offset64)
+		outp += sprintf(outp, "  %11llu", t->extra_delta64);
 	/* msr */
 	if (extra_msr_offset32)
-		outp += sprintf(outp, "  0x%08x", t->extra_msr32);
+		outp += sprintf(outp, "  0x%08llx", t->extra_msr32);
 
 	/* MSR */
 	if (extra_msr_offset64)
@@ -533,8 +534,13 @@ delta_thread(struct thread_data *new, struct thread_data *old,
 		old->mperf = 1;	/* divide by 0 protection */
 	}
 
+	old->extra_delta32 = new->extra_delta32 - old->extra_delta32;
+	old->extra_delta32 &= 0xFFFFFFFF;
+
+	old->extra_delta64 = new->extra_delta64 - old->extra_delta64;
+
 	/*
-	 * Extra MSR is a snapshot, simply copy latest w/o subtracting
+	 * Extra MSR is just a snapshot, simply copy latest w/o subtracting
 	 */
 	old->extra_msr32 = new->extra_msr32;
 	old->extra_msr64 = new->extra_msr64;
@@ -565,6 +571,9 @@ void clear_counters(struct thread_data *t, struct core_data *c, struct pkg_data
 	t->mperf = 0;
 	t->c1 = 0;
 
+	t->extra_delta32 = 0;
+	t->extra_delta64 = 0;
+
 	/* tells format_counters to dump all fields from this set */
 	t->flags = CPU_IS_FIRST_THREAD_IN_CORE | CPU_IS_FIRST_CORE_IN_PACKAGE;
 
@@ -585,6 +594,9 @@ int sum_counters(struct thread_data *t, struct core_data *c,
 	average.threads.mperf += t->mperf;
 	average.threads.c1 += t->c1;
 
+	average.threads.extra_delta32 += t->extra_delta32;
+	average.threads.extra_delta64 += t->extra_delta64;
+
 	/* sum per-core values only for 1st thread in core */
 	if (!(t->flags & CPU_IS_FIRST_THREAD_IN_CORE))
 		return 0;
@@ -620,6 +632,11 @@ void compute_average(struct thread_data *t, struct core_data *c,
 	average.threads.mperf /= topo.num_cpus;
 	average.threads.c1 /= topo.num_cpus;
 
+	average.threads.extra_delta32 /= topo.num_cpus;
+	average.threads.extra_delta32 &= 0xFFFFFFFF;
+
+	average.threads.extra_delta64 /= topo.num_cpus;
+
 	average.cores.c3 /= topo.num_cores;
 	average.cores.c6 /= topo.num_cores;
 	average.cores.c7 /= topo.num_cores;
@@ -661,10 +678,22 @@ int get_counters(struct thread_data *t, struct core_data *c, struct pkg_data *p)
 			return -4;
 	}
 
-	if (extra_msr_offset32)
-		if (get_msr32(cpu, extra_msr_offset32, &t->extra_msr32))
+	if (extra_delta_offset32) {
+		if (get_msr(cpu, extra_delta_offset32, &t->extra_delta32))
+			return -5;
+		t->extra_delta32 &= 0xFFFFFFFF;
+	}
+
+	if (extra_delta_offset64)
+		if (get_msr(cpu, extra_delta_offset64, &t->extra_delta64))
 			return -5;
 
+	if (extra_msr_offset32) {
+		if (get_msr(cpu, extra_msr_offset32, &t->extra_msr32))
+			return -5;
+		t->extra_msr32 &= 0xFFFFFFFF;
+	}
+
 	if (extra_msr_offset64)
 		if (get_msr(cpu, extra_msr_offset64, &t->extra_msr64))
 			return -5;
@@ -1275,7 +1304,7 @@ void check_cpuid()
 
 void usage()
 {
-	fprintf(stderr, "%s: [-v] [-m msr#] [-M MSR#] [-i interval_sec | command ...]\n",
+	fprintf(stderr, "%s: [-v][-d MSR#][-D MSR#][-m MSR#][-M MSR#][-i interval_sec | command ...]\n",
 		progname);
 	exit(1);
 }
@@ -1565,7 +1594,7 @@ void cmdline(int argc, char **argv)
 
 	progname = argv[0];
 
-	while ((opt = getopt(argc, argv, "+cpsvi:m:M:")) != -1) {
+	while ((opt = getopt(argc, argv, "+cpsvid:D:m:M:")) != -1) {
 		switch (opt) {
 		case 'c':
 			show_core_only++;
@@ -1582,15 +1611,17 @@ void cmdline(int argc, char **argv)
 		case 'i':
 			interval_sec = atoi(optarg);
 			break;
+		case 'd':
+			sscanf(optarg, "%x", &extra_delta_offset32);
+			break;
+		case 'D':
+			sscanf(optarg, "%x", &extra_delta_offset64);
+			break;
 		case 'm':
 			sscanf(optarg, "%x", &extra_msr_offset32);
-			if (verbose > 1)
-				fprintf(stderr, "msr 0x%X\n", extra_msr_offset32);
 			break;
 		case 'M':
 			sscanf(optarg, "%x", &extra_msr_offset64);
-			if (verbose > 1)
-				fprintf(stderr, "MSR 0x%X\n", extra_msr_offset64);
 			break;
 		default:
 			usage();
