X-Git-Url: https://git.kernel.dk/?p=fio.git;a=blobdiff_plain;f=HOWTO;h=f4efd281bbc72e2a4a54dfc233aab2310fa0643d;hp=1d1aa61d3daf357d734545e83b1ecabb35e237f2;hb=993bf48b48f2d9724afa3698a15070e77bc5d1c0;hpb=3e4889209b86409283d1e87bb6b5c9980495c2c6

diff --git a/HOWTO b/HOWTO
index 1d1aa61d..f4efd281 100644
--- a/HOWTO
+++ b/HOWTO
@@ -848,6 +848,13 @@ disable_slat=bool Disable measurements of submission latency numbers. See
 disable_bw=bool	Disable measurements of throughput/bandwidth numbers. See
 		disable_clat.
 
+gtod_reduce=bool Enable all of the gettimeofday() reducing options
+		(disable_clat, disable_slat, disable_bw) plus reduce
+		precision of the timeout somewhat to really shrink
+		the gettimeofday() call count. With this option enabled,
+		we only do about 0.4% of the gtod() calls we would have
+		done if all time keeping was enabled.
+
 
 6.0 Interpreting the output
 ---------------------------