Add zero_buffers option
This option will cause all IO buffers to be initialized to all zeroes.
The default is to fill them with random data.
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/fio.c b/fio.c
index c39868d..4d225f8 100644
--- a/fio.c
+++ b/fio.c
@@ -593,14 +593,17 @@
/*
* "randomly" fill the buffer contents
*/
-static void fill_rand_buf(struct io_u *io_u, int max_bs)
+static void fill_io_buf(struct thread_data *td, struct io_u *io_u, int max_bs)
{
int *ptr = io_u->buf;
- while ((void *) ptr - io_u->buf < max_bs) {
- *ptr = rand() * 0x9e370001;
- ptr++;
- }
+ if (!td->o.zero_buffers) {
+ while ((void *) ptr - io_u->buf < max_bs) {
+ *ptr = rand() * 0x9e370001;
+ ptr++;
+ }
+ } else
+ memset(ptr, 0, max_bs);
}
static int init_io_u(struct thread_data *td)
@@ -641,8 +644,9 @@
INIT_LIST_HEAD(&io_u->list);
io_u->buf = p + max_bs * i;
+
if (td_write(td))
- fill_rand_buf(io_u, max_bs);
+ fill_io_buf(td, io_u, max_bs);
io_u->index = i;
io_u->flags = IO_U_F_FREE;