[PATCH] Randomly fill output buffers
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/fio.c b/fio.c
index 81e9e90..52caa4e 100644
--- a/fio.c
+++ b/fio.c
@@ -479,6 +479,19 @@
free_io_mem(td);
}
+/*
+ * "randomly" fill the buffer contents
+ */
+static void fill_rand_buf(struct io_u *io_u, unsigned int max_bs)
+{
+ unsigned int *ptr = io_u->buf;
+
+ while ((void *) ptr - io_u->buf < max_bs) {
+ *ptr = rand() * 0x9e370001;
+ ptr++;
+ }
+}
+
static int init_io_u(struct thread_data *td)
{
struct io_u *io_u;
@@ -505,6 +518,9 @@
INIT_LIST_HEAD(&io_u->list);
io_u->buf = p + td->max_bs * i;
+ if (td_write(td) || td_rw(td))
+ fill_rand_buf(io_u, td->max_bs);
+
io_u->index = i;
list_add(&io_u->list, &td->io_u_freelist);
}