X-Git-Url: https://git.kernel.dk/?p=fio.git;a=blobdiff_plain;f=HOWTO;h=a5caea3db7a6201d74311b50a5d5d56bbbb77311;hp=1176d2287f815439c680a38249a104682fcae64a;hb=36dff96650e663e972d7f4318710d5730adaeb90;hpb=787f7e95a3fb3bbe88431da53337bb9551d2357c

diff --git a/HOWTO b/HOWTO
index 1176d228..a5caea3d 100644
--- a/HOWTO
+++ b/HOWTO
@@ -264,6 +264,10 @@ ioengine=str	Defines how the job issues io to the file. The following
 				we use read(2) and write(2) for asynchronous
 				io.
 
+			null	Doesn't transfer any data, just pretends
+				to. This is mainly used to exercise fio
+				itself and for debugging/testing purposes.
+
 iodepth=int	This defines how many io units to keep in flight against
 		the file. The default is 1 for each file defined in this
 		job, can be overridden with a larger value for higher