1 files changed, 28 insertions, 21 deletions

diff --git a/usr.sbin/diskinfo/diskinfo.c b/usr.sbin/diskinfo/diskinfo.c
index 168a9098262b..554b09e9c2d1 100644
--- a/usr.sbin/diskinfo/diskinfo.c
+++ b/usr.sbin/diskinfo/diskinfo.c
@@ -32,6 +32,7 @@
 #include <stdio.h>
 #include <stdint.h>
 #include <stdlib.h>
+#include <strings.h>
 #include <unistd.h>
 #include <errno.h>
 #include <fcntl.h>
@@ -171,7 +172,7 @@ static char sector[65536];
 static char mega[1024 * 1024];
 
 static void
-rdsect(int fd, u_int blockno, u_int sectorsize)
+rdsect(int fd, off_t blockno, u_int sectorsize)
 {
 	int error;
 
@@ -232,21 +233,27 @@ TR(double count)
 static void
 speeddisk(int fd, off_t mediasize, u_int sectorsize)
 {
-	int i;
-	uint b0, b1, sectorcount;
+	int bulk, i;
+	off_t b0, b1, sectorcount, step;
 
 	sectorcount = mediasize / sectorsize;
+	step = 1ULL << (flsll(sectorcount / (4 * 200)) - 1);
+	if (step > 16384)
+		step = 16384;
+	bulk = mediasize / (1024 * 1024);
+	if (bulk > 100)
+		bulk = 100;
 
 	printf("Seek times:\n");
 	printf("\tFull stroke:\t");
 	b0 = 0;
-	b1 = sectorcount - 1 - 16384;
+	b1 = sectorcount - step;
 	T0();
 	for (i = 0; i < 125; i++) {
 		rdsect(fd, b0, sectorsize);
-		b0 += 16384;
+		b0 += step;
 		rdsect(fd, b1, sectorsize);
-		b1 -= 16384;
+		b1 -= step;
 	}
 	TN(250);
 
@@ -256,9 +263,9 @@ speeddisk(int fd, off_t mediasize, u_int sectorsize)
 	T0();
 	for (i = 0; i < 125; i++) {
 		rdsect(fd, b0, sectorsize);
-		b0 += 16384;
+		b0 += step;
 		rdsect(fd, b1, sectorsize);
-		b1 += 16384;
+		b1 += step;
 	}
 	TN(250);
 	printf("\tQuarter stroke:\t");
@@ -267,9 +274,9 @@ speeddisk(int fd, off_t mediasize, u_int sectorsize)
 	T0();
 	for (i = 0; i < 250; i++) {
 		rdsect(fd, b0, sectorsize);
-		b0 += 16384;
+		b0 += step;
 		rdsect(fd, b1, sectorsize);
-		b1 += 16384;
+		b1 += step;
 	}
 	TN(500);
 
@@ -278,7 +285,7 @@ speeddisk(int fd, off_t mediasize, u_int sectorsize)
 	T0();
 	for (i = 0; i < 400; i++) {
 		rdsect(fd, b0, sectorsize);
-		b0 += 16384;
+		b0 += step;
 	}
 	TN(400);
 
@@ -287,7 +294,7 @@ speeddisk(int fd, off_t mediasize, u_int sectorsize)
 	T0();
 	for (i = 0; i < 400; i++) {
 		rdsect(fd, b0, sectorsize);
-		b0 -= 16384;
+		b0 -= step;
 	}
 	TN(400);
 
@@ -301,7 +308,7 @@ speeddisk(int fd, off_t mediasize, u_int sectorsize)
 	TN(2048);
 
 	printf("\tSeq inner:\t");
-	b0 = sectorcount - 2048 - 1;
+	b0 = sectorcount - 2048;
 	T0();
 	for (i = 0; i < 2048; i++) {
 		rdsect(fd, b0, sectorsize);
@@ -313,28 +320,28 @@ speeddisk(int fd, off_t mediasize, u_int sectorsize)
 	printf("\toutside:     ");
 	rdsect(fd, 0, sectorsize);
 	T0();
-	for (i = 0; i < 100; i++) {
+	for (i = 0; i < bulk; i++) {
 		rdmega(fd);
 	}
-	TR(100 * 1024);
+	TR(bulk * 1024);
 
 	printf("\tmiddle:      ");
-	b0 = sectorcount / 2;
+	b0 = sectorcount / 2 - bulk * (1024*1024 / sectorsize) / 2 - 1;
 	rdsect(fd, b0, sectorsize);
 	T0();
-	for (i = 0; i < 100; i++) {
+	for (i = 0; i < bulk; i++) {
 		rdmega(fd);
 	}
-	TR(100 * 1024);
+	TR(bulk * 1024);
 
 	printf("\tinside:      ");
-	b0 = sectorcount - 100 * (1024*1024 / sectorsize) - 1;;
+	b0 = sectorcount - bulk * (1024*1024 / sectorsize) - 1;;
 	rdsect(fd, b0, sectorsize);
 	T0();
-	for (i = 0; i < 100; i++) {
+	for (i = 0; i < bulk; i++) {
 		rdmega(fd);
 	}
-	TR(100 * 1024);
+	TR(bulk * 1024);
 
 	printf("\n");
 	return;