dedupe: if percentage is 100, don't go through random + math

[fio.git] / fio.1

diff --git a/fio.1 b/fio.1
index c61948bb52814a2a6bac248c5db0063406225a48..bc6c9fa655e8eefe13d410013309679dcf2eb7e5 100644 (file)
--- a/fio.1
+++ b/fio.1
@@ -478,7 +478,15 @@ size, fio can alternate random and zeroed data throughout the IO buffer.
 If set, fio will fill the IO buffers with this pattern. If not set, the contents
 of IO buffers is defined by the other options related to buffer contents. The
 setting can be any pattern of bytes, and can be prefixed with 0x for hex
-values.
+values. It may also be a string, where the string must then be wrapped with
+"".
+.TP
+.BI dedupe_percentage \fR=\fPint
+If set, fio will generate this percentage of identical buffers when writing.
+These buffers will be naturally dedupable. The contents of the buffers depend
+on what other buffer compression settings have been set. It's possible to have
+the individual buffers either fully compressible, or not at all. This option
+only controls the distribution of unique buffers.
 .TP
 .BI nrfiles \fR=\fPint
 Number of files to use for this job.  Default: 1.