Improve random verify block sorting

[fio.git] / HOWTO

diff --git a/HOWTO b/HOWTO
index a5be9dbd3e8d408bbe27491e4b15d76b30e5aa43..7cab05379f612034abdc173f03acb8d7850f902f 100644 (file)
--- a/HOWTO
+++ b/HOWTO
@@ -563,6 +563,14 @@ verify=str If writing to a file, fio can verify the file contents
                system to make sure that the written data is also
                correctly read back.
 
                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
 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