From b19c5ee1357ffb74f4de57b1617364bbbaacf1a0 Mon Sep 17 00:00:00 2001 From: Pankaj Raghav Date: Fri, 7 Oct 2022 14:05:28 +0200 Subject: [PATCH] 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 Signed-off-by: Vincent Fu --- examples/uring-cmd-zoned.fio | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/examples/uring-cmd-zoned.fio b/examples/uring-cmd-zoned.fio index 58e8f79e..89be61be 100644 --- 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 -- 2.25.1