Update iodepth_batch documentation

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

diff --git a/HOWTO b/HOWTO
index ca095a322895be3065081db5bd600fb12609f3e7..a20f7141e63593dd8ed54b696ab80c92e28695a4 100644 (file)
--- a/HOWTO
+++ b/HOWTO
@@ -402,8 +402,9 @@ iodepth=int This defines how many io units to keep in flight against
                concurrency.
 
 iodepth_batch=int This defines how many pieces of IO to submit at once.
                concurrency.
 
 iodepth_batch=int This defines how many pieces of IO to submit at once.

-               It defaults to the same as iodepth, but can be set lower
-               if one so desires.
+               It defaults to 1 which means that we submit each IO
+               as soon as it is available, but can be raised to submit
+               bigger batches of IO at the time.

 
 iodepth_low=int        The low water mark indicating when to start filling
                the queue again. Defaults to the same as iodepth, meaning
 
 iodepth_low=int        The low water mark indicating when to start filling
                the queue again. Defaults to the same as iodepth, meaning