examples: uring-cmd-zoned: expand the reasoning behind QD1

Expand the reasoning behind using QD1 for zoned devices with io_uring_cmd engine. Signed-off-by: Pankaj Raghav <[email protected]> Signed-off-by: Vincent Fu <[email protected]>
Dummyc0m · Oct 7, 2022 · b19c5ee · b19c5ee
1 parent 7aeb498
commit b19c5ee
Showing 1 changed file with 6 additions and 2 deletions.
diff --git a/examples/uring-cmd-zoned.fio b/examples/uring-cmd-zoned.fio
@@ -1,7 +1,11 @@
 # io_uring_cmd I/O engine for nvme-ns generic zoned character device
 #
-# NOTE: with write workload iodepth must be set to 1 as there is no IO
-# scheduler.
+# NOTE:
+# Regular writes against a zone should be limited to QD1, as the device can
+# reorder the requests.
+#
+# As the passthrough path do not use an IO scheduler (such as mq-deadline),
+# the queue depth should be limited to 1 to avoid zone invalid writes.
 
 [global]
 filename=/dev/ng0n1