Update documentation for random_distribution=gauss

[fio.git] / HOWTO

diff --git a/HOWTO b/HOWTO
index c37a9e09ac53d69d94fa925a5486b8fc8387eb02..d70c9afebf04b9f0a2114e838dc340db3eeccf03 100644 (file)
--- a/HOWTO
+++ b/HOWTO
@@ -963,6 +963,7 @@ random_distribution=str:float       By default, fio will use a completely uniform
                random          Uniform random distribution
                zipf            Zipf distribution
                pareto          Pareto distribution
+               gauss           Normal (guassian) distribution
 
                When using a zipf or pareto distribution, an input value
                is also needed to define the access pattern. For zipf, this
@@ -971,7 +972,9 @@ random_distribution=str:float       By default, fio will use a completely uniform
                what the given input values will yield in terms of hit rates.
                If you wanted to use zipf with a theta of 1.2, you would use
                random_distribution=zipf:1.2 as the option. If a non-uniform
-               model is used, fio will disable use of the random map.
+               model is used, fio will disable use of the random map. For
+               the gauss distribution, a normal deviation is supplied as
+               a value between 0 and 100.
 
 percentage_random=int  For a random workload, set how big a percentage should
                be random. This defaults to 100%, in which case the workload