allow a percent value for the offset parameter

[fio.git] / fio.1

diff --git a/fio.1 b/fio.1
index 0167c23e8ead51904fec13213b052da4d0eaed9e..31eb161c373634511e4d8d896966bffdd7744ef0 100644 (file)
--- a/fio.1
+++ b/fio.1
@@ -904,7 +904,11 @@ If true, use buffered I/O.  This is the opposite of the \fBdirect\fR parameter.
 Default: true.
 .TP
 .BI offset \fR=\fPint
-Offset in the file to start I/O. Data before the offset will not be touched.
+Start I/O at the provided offset in the file, given as either a fixed size or a
+percentage. If a percentage is given, the next \fBblockalign\fR-ed offset will
+be used. Data before the given offset will not be touched. This effectively
+caps the file size at (real_size - offset). Can be combined with \fBsize\fR to
+constrain the start and end range of the I/O workload.
 .TP
 .BI offset_increment \fR=\fPint
 If this is provided, then the real offset becomes the