diff --git a/benchmarks/gem_userptr_benchmark.c b/benchmarks/gem_userptr_benchmark.c
index 4d7442b..04af219 100644
--- a/benchmarks/gem_userptr_benchmark.c
+++ b/benchmarks/gem_userptr_benchmark.c
@@ -213,7 +213,8 @@ static void exchange_ptr(void *array, unsigned i, unsigned j)
 static void test_malloc_free(int random)
 {
 	unsigned long iter = 0;
-	unsigned int i, tot = 1000;
+	unsigned int i;
+	const unsigned int tot = 1000;
 	void *ptr[tot];
 
 	start_test(test_duration_sec);
@@ -230,13 +231,14 @@ static void test_malloc_free(int random)
 		iter++;
 	}
 
-	printf("%8lu iter/s\n", iter / test_duration_sec);
+	printf("%10lu op/s\n", 2 * tot * iter / test_duration_sec);
 }
 
 static void test_malloc_realloc_free(int random)
 {
 	unsigned long iter = 0;
-	unsigned int i, tot = 1000;
+	unsigned int i;
+	const unsigned int tot = 1000;
 	void *ptr[tot];
 
 	start_test(test_duration_sec);
@@ -259,13 +261,14 @@ static void test_malloc_realloc_free(int random)
 		iter++;
 	}
 
-	printf("%8lu iter/s\n", iter / test_duration_sec);
+	printf("%10lu op/s\n", 3 * tot * iter / test_duration_sec);
 }
 
 static void test_mmap_unmap(int random)
 {
 	unsigned long iter = 0;
-	unsigned int i, tot = 1000;
+	unsigned int i;
+	const unsigned int tot = 1000;
 	void *ptr[tot];
 
 	start_test(test_duration_sec);
@@ -283,7 +286,7 @@ static void test_mmap_unmap(int random)
 		iter++;
 	}
 
-	printf("%8lu iter/s\n", iter / test_duration_sec);
+	printf("%10lu op/s\n", 2 * tot * iter / test_duration_sec);
 }
 
 static void test_ptr_read(void *ptr)
@@ -307,7 +310,7 @@ static void test_ptr_read(void *ptr)
 		iter++;
 	}
 
-	printf("%8lu MB/s\n", iter / test_duration_sec * BO_SIZE / 1000000);
+	printf("%10lu MB/s\n", iter / test_duration_sec * BO_SIZE / 1000000);
 }
 
 static void test_ptr_write(void *ptr)
@@ -331,7 +334,31 @@ static void test_ptr_write(void *ptr)
 		iter++;
 	}
 
-	printf("%8lu MB/s\n", iter / test_duration_sec * BO_SIZE / 1000000);
+	printf("%10lu MB/s\n", iter / test_duration_sec * BO_SIZE / 1000000);
+}
+
+static void test_impact_common(void *ptr, unsigned int nr)
+{
+	printf("ptr-read,                   %5u bos = ", nr);
+	test_ptr_read(ptr);
+
+	printf("ptr-write,                  %5u bos = ", nr);
+	test_ptr_write(ptr);
+
+	printf("malloc-free,                %5u bos = ", nr);
+	test_malloc_free(0);
+	printf("malloc-free-random,         %5u bos = ", nr);
+	test_malloc_free(1);
+
+	printf("malloc-realloc-free,        %5u bos = ", nr);
+	test_malloc_realloc_free(0);
+	printf("malloc-realloc-free-random, %5u bos = ", nr);
+	test_malloc_realloc_free(1);
+
+	printf("mmap-unmap,                 %5u bos = ", nr);
+	test_mmap_unmap(0);
+	printf("mmap-unmap-random,          %5u bos = ", nr);
+	test_mmap_unmap(1);
 }
 
 static void test_impact(int fd)
@@ -351,29 +378,46 @@ static void test_impact(int fd)
 		else
 			ptr = buffer;
 
-		printf("ptr-read,                   %5u bos = ", nr_bos[subtest]);
-		test_ptr_read(ptr);
+		test_impact_common(ptr, nr_bos[subtest]);
 
-		printf("ptr-write                   %5u bos = ", nr_bos[subtest]);
-		test_ptr_write(ptr);
+		for (i = 0; i < nr_bos[subtest]; i++)
+			free_userptr_bo(fd, handles[i]);
+	}
+}
 
-		printf("malloc-free,                %5u bos = ", nr_bos[subtest]);
-		test_malloc_free(0);
-		printf("malloc-free-random          %5u bos = ", nr_bos[subtest]);
-		test_malloc_free(1);
+static void test_impact_overlap(int fd)
+{
+	unsigned int total = sizeof(nr_bos) / sizeof(nr_bos[0]);
+	unsigned int subtest, i;
+	uint32_t handles[nr_bos[total-1]];
+	void *ptr;
+	char buffer[BO_SIZE];
+	void *block;
+	uint32_t handle;
+	int ret;
 
-		printf("malloc-realloc-free,        %5u bos = ", nr_bos[subtest]);
-		test_malloc_realloc_free(0);
-		printf("malloc-realloc-free-random, %5u bos = ", nr_bos[subtest]);
-		test_malloc_realloc_free(1);
+	for (subtest = 0; subtest < total; subtest++) {
+		if (nr_bos[subtest] > 0) {
+			ret = posix_memalign(&block, PAGE_SIZE, BO_SIZE * nr_bos[subtest]);
+			igt_assert(ret == 0);
+			for (ptr = block, i = 0; i < nr_bos[subtest]; i++) {
+				ret = gem_userptr(fd, ptr, BO_SIZE, 0, &handle);
+				igt_assert(ret == 0);
+				handles[i] = handle;
+				ptr = (char *)ptr + BO_SIZE / 2;
+			}
+			ptr = block;
+		} else {
+			ptr = buffer;
+		}
 
-		printf("mmap-unmap,                 %5u bos = ", nr_bos[subtest]);
-		test_mmap_unmap(0);
-		printf("mmap-unmap-random,          %5u bos = ", nr_bos[subtest]);
-		test_mmap_unmap(1);
+		test_impact_common(ptr, nr_bos[subtest]);
 
 		for (i = 0; i < nr_bos[subtest]; i++)
-			free_userptr_bo(fd, handles[i]);
+			gem_close(fd, handles[i]);
+
+		if (nr_bos[subtest])
+			free(block);
 	}
 }
 
@@ -494,6 +538,9 @@ int main(int argc, char **argv)
 	igt_subtest("userptr-impact-sync")
 		test_impact(fd);
 
+	igt_subtest("userptr-overlap-impact-sync")
+		test_impact_overlap(fd);
+
 	igt_exit();
 
 	return 0;
