X-Git-Url: https://git.kernel.dk/?a=blobdiff_plain;f=HOWTO;h=7cab05379f612034abdc173f03acb8d7850f902f;hb=cbf5c1d7a2286fa1cf548c0678b3b0bf13bcda7e;hp=8312d9315ae3a591b7a85cdd0822c86626ace840;hpb=d2f3ac3592a5674fefa082cb439cc72355d2fed0;p=fio.git

diff --git a/HOWTO b/HOWTO
index 8312d931..7cab0537 100644
--- a/HOWTO
+++ b/HOWTO
@@ -555,10 +555,22 @@ verify=str	If writing to a file, fio can verify the file contents
 			crc32	Use a crc32 sum of the data area and store
 				it in the header of each block.
 
+			null	Only pretend to verify. Useful for testing
+				internals with ioengine=null, not for much
+				else.
+
 		This option can be used for repeated burn-in tests of a
 		system to make sure that the written data is also
 		correctly read back.
 
+verifysort=bool	If set, fio will sort written verify blocks when it deems
+		it faster to read them back in a sorted manner. This is
+		often the case when overwriting an existing file, since
+		the blocks are already laid out in the file system. You
+		can ignore this option unless doing huge amounts of really
+		fast IO where the red-black tree sorting CPU time becomes
+		significant.
+		
 stonewall	Wait for preceeding jobs in the job file to exit, before
 		starting this one. Can be used to insert serialization
 		points in the job file. A stone wall also implies starting