options: add priohint option

[fio.git] / HOWTO.rst

diff --git a/HOWTO.rst b/HOWTO.rst
index 7fe70fbdd0ba8425fe759fa2e116ff7e6bb47024..d1a476e4941ddf726ea7655438450bd5aa0298cc 100644 (file)
--- a/HOWTO.rst
+++ b/HOWTO.rst
@@ -3436,6 +3436,15 @@ Threads, processes and job synchronization
        priority setting, see I/O engine specific :option:`cmdprio_percentage`
        and :option:`cmdprio_class` options.
 
+.. option:: priohint=int
+
+       Set the I/O priority hint. This is only applicable to platforms that
+       support I/O priority classes and to devices with features controlled
+       through priority hints, e.g. block devices supporting command duration
+       limits, or CDL. CDL is a way to indicate the desired maximum latency
+       of I/Os so that the device can optimize its internal command scheduling
+       according to the latency limits indicated by the user.
+
 .. option:: cpus_allowed=str
 
        Controls the same options as :option:`cpumask`, but accepts a textual