Add option to disable fadvise() hints

[fio.git] / HOWTO

diff --git a/HOWTO b/HOWTO
index 051a4554a95ff8a1229d3154a1c6bd31f701c9c6..8312d9315ae3a591b7a85cdd0822c86626ace840 100644 (file)
--- a/HOWTO
+++ b/HOWTO
@@ -240,6 +240,13 @@ rw=str             Type of io pattern. Accepted values are:
 randrepeat=bool        For random IO workloads, seed the generator in a predictable
                way so that results are repeatable across repetitions.
 
+fadvise_hint=bool By default, fio will use fadvise() to advise the kernel
+               on what IO patterns it is likely to issue. Sometimes you
+               want to test specific IO patterns without telling the
+               kernel about it, in which case you can disable this option.
+               If set, fio will use POSIX_FADV_SEQUENTIAL for sequential
+               IO and POSIX_FADV_RANDOM for random IO.
+
 size=siint     The total size of file io for this job. This may describe
                the size of the single file the job uses, or it may be
                divided between the number of files in the job. If the