Add option for controlling buffer scrambling
scramble_buffers bool option, defaults to on.
Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/fio.1 b/fio.1
index e8fb57f..dc10b40 100644
--- a/fio.1
+++ b/fio.1
@@ -329,6 +329,13 @@
if zero_buffers isn't specified, naturally. If data verification is enabled,
refill_buffers is also automatically enabled.
.TP
+.BI scramble_buffers \fR=\fPbool
+If \fBrefill_buffers\fR is too costly and the target is using data
+deduplication, then setting this option will slightly modify the IO buffer
+contents to defeat normal de-dupe attempts. This is not enough to defeat
+more clever block compression attempts, but it will stop naive dedupe
+of blocks. Default: true.
+.TP
.BI nrfiles \fR=\fPint
Number of files to use for this job. Default: 1.
.TP