HOWTO: Mention cpuload= is mandatory for cpuio

fio jobs using cpuio fail without this option value specified,
so mention it's mandatory (or have default value for this ?).

fio: pid=9320, err=22/file:engines/cpu.c:75, func=cpuio, error=cpu thread needs rate (cpuload=)
Signed-off-by: Tomohiro Kusumi <tkusumi@tuxera.com>
Signed-off-by: Jens Axboe <axboe@fb.com>

diff --git a/HOWTO b/HOWTO
index 5d378f3d9a75cf7c0e1cd7ca95f65ecaee060d58..1ce1b0c1b441f955b6ccfd03e6a2e802fcce5a28 100644 (file)
--- a/HOWTO
+++ b/HOWTO
@@ -1748,7 +1748,8 @@ caveat that when used on the command line, they must come after the
 
 .. option:: cpuload=int : [cpuio]
 
-       Attempt to use the specified percentage of CPU cycles.
+       Attempt to use the specified percentage of CPU cycles. This is a mandatory
+       option when using cpuio I/O engine.
 
 .. option:: cpuchunks=int : [cpuio]