Pre-load and sort random blocks for pure read verify workloads

[fio.git] / HOWTO

diff --git a/HOWTO b/HOWTO
index b349620107f2dc9935ad07b5cdfda6e0dffc2f73..014b7f3d4ca763135f131c163a054709e6b637e0 100644 (file)
--- a/HOWTO
+++ b/HOWTO
@@ -844,9 +844,7 @@ cpus_allowed=str Controls the same options as cpumask, but it allows a text
 numa_cpu_nodes=str Set this job running on spcified NUMA nodes' CPUs. The
                arguments allow comma delimited list of cpu numbers,
                A-B ranges, or 'all'. Note, to enable numa options support,
-               export the following environment variables,
-                       export EXTFLAGS+=" -DFIO_HAVE_LIBNUMA "
-                       export EXTLIBS+=" -lnuma "
+               fio must be built on a system with libnuma-dev(el) installed.
 
 numa_mem_policy=str Set this job's memory policy and corresponding NUMA
                nodes. Format of the argements:
@@ -1262,6 +1260,22 @@ percentile_list=float_list Overwrite the default list of percentiles
                the values of completion latency below which 99.5% and
                99.9% of the observed latencies fell, respectively.
 
+clocksource=str        Use the given clocksource as the base of timing. The
+               supported options are:
+
+                       gettimeofday    gettimeofday(2)
+
+                       clock_gettime   clock_gettime(2)
+
+                       cpu             Internal CPU clock source
+
+               cpu is the preferred clocksource if it is reliable, as it
+               is very fast (and fio is heavy on time calls). Fio will
+               automatically use this clocksource if it's supported and
+               considered reliable on the system it is running on, unless
+               another clocksource is specifically set. For x86/x86-64 CPUs,
+               this means supporting TSC Invariant.
+
 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