Switch to using our internal Tausworthe based random generator for offsets

[fio.git] / HOWTO

diff --git a/HOWTO b/HOWTO
index d4e70923facf5b0b3ed322a551bee9a445fc3046..69b8cc6766850b6ceab07a0c15ea7e872142838e 100644 (file)
--- a/HOWTO
+++ b/HOWTO
@@ -348,6 +348,12 @@ 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.
 
+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=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