Update HOWTO and man page for thinktime blocks impact on queue depth
Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/HOWTO b/HOWTO
index 9b2edb3..794728f 100644
--- a/HOWTO
+++ b/HOWTO
@@ -830,11 +830,15 @@
to sleeping for the rest of the period specified by
thinktime.
-thinktime_blocks
+thinktime_blocks=int
Only valid if thinktime is set - control how many blocks
to issue, before waiting 'thinktime' usecs. If not set,
defaults to 1 which will make fio wait 'thinktime' usecs
- after every block.
+ after every block. This effectively makes any queue depth
+ setting redundant, since no more than 1 IO will be queued
+ before we have to complete it and do our thinktime. In
+ other words, this setting effectively caps the queue depth
+ if the latter is larger.
rate=int Cap the bandwidth used by this job. The number is in bytes/sec,
the normal suffix rules apply. You can use rate=500k to limit