Align io units to processor cache line size
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/fio.c b/fio.c
index ad2282d..1aba82d 100644
--- a/fio.c
+++ b/fio.c
@@ -733,7 +733,7 @@
{
struct io_u *io_u;
unsigned int max_bs;
- int i, max_units;
+ int cl_align, i, max_units;
char *p;
max_units = td->o.iodepth;
@@ -761,10 +761,20 @@
else
p = td->orig_buffer;
+ cl_align = os_cache_line_size();
+
for (i = 0; i < max_units; i++) {
+ void *ptr;
+
if (td->terminate)
return 1;
- io_u = malloc(sizeof(*io_u));
+
+ if (posix_memalign(&ptr, cl_align, sizeof(*io_u))) {
+ log_err("fio: posix_memalign=%s\n", strerror(errno));
+ break;
+ }
+
+ io_u = ptr;
memset(io_u, 0, sizeof(*io_u));
INIT_FLIST_HEAD(&io_u->list);