X-Git-Url: https://git.kernel.dk/?p=fio.git;a=blobdiff_plain;f=HOWTO;h=ee899b8fdb6c402814086dde41f986d152c456c9;hp=d4e70923facf5b0b3ed322a551bee9a445fc3046;hb=afa16407813ee36e75aaa665613c469500ed07c6;hpb=74586c1efe37b4eac189cd8dd1eb00e96babce3f

diff --git a/HOWTO b/HOWTO
index d4e70923..ee899b8f 100644
--- a/HOWTO
+++ b/HOWTO
@@ -348,11 +348,25 @@ kb_base=int	The base unit for a kilobyte. The defacto base is 2^10, 1024.
 randrepeat=bool	For random IO workloads, seed the generator in a predictable
 		way so that results are repeatable across repetitions.
 
-fallocate=bool	By default, fio will use fallocate() to advise the system
-		of the size of the file we are going to write. This can be
-		turned off with fallocate=0. May not be available on all
-		supported platforms.  If using ZFS on Solaris this must be
-		set to 0 because ZFS doesn't support it.
+use_os_rand=bool Fio can either use the random generator supplied by the OS
+		to generator random offsets, or it can use it's own internal
+		generator (based on Tausworthe). Default is to use the
+		internal generator, which is often of better quality and
+		faster.
+
+fallocate=str	Whether pre-allocation is performed when laying down files.
+		Accepted values are:
+
+			none		Do not pre-allocate space
+			posix		Pre-allocate via posix_fallocate()
+			keep		Pre-allocate via fallocate() with
+					FALLOC_FL_KEEP_SIZE set
+			0		Backward-compatible alias for 'none'
+			1		Backward-compatible alias for 'posix'
+
+		May not be available on all supported platforms. 'keep' is only
+		available on Linux.If using ZFS on Solaris this must be set to
+		'none' because ZFS doesn't support it. Default: 'posix'.
 
 fadvise_hint=bool By default, fio will use fadvise() to advise the kernel
 		on what IO patterns it is likely to issue. Sometimes you