Add zero_buffers option

[fio.git] / fio.c

diff --git a/fio.c b/fio.c
index c76944568b25d4dbcf23a2e06d4758743544dda6..4d225f84b409a7efde36394e05dd296157ad851b 100644 (file)
--- a/fio.c
+++ b/fio.c
@@ -593,14 +593,17 @@ static void cleanup_io_u(struct thread_data *td)
 /*
  * "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 @@ static int init_io_u(struct thread_data *td)
                INIT_LIST_HEAD(&io_u->list);
 
                io_u->buf = p + max_bs * i;
-               if (td_write(td) || td_rw(td))
-                       fill_rand_buf(io_u, max_bs);
+
+               if (td_write(td))
+                       fill_io_buf(td, io_u, max_bs);
 
                io_u->index = i;
                io_u->flags = IO_U_F_FREE;