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null_blk: update usage hints for submit_queues

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update the range of submits_queues, and correct usage hints.

Signed-off-by: weiping zhang <zhangweiping@didichuxing.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
weiping zhang 2017-10-14 00:26:28 +08:00 committed by Jens Axboe
parent cdd094fd0a
commit 23c4490d2b
1 changed files with 3 additions and 3 deletions
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6
Documentation/block/null_blk.txt
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@ -55,10 +55,10 @@ irqmode=[0-2]: Default: 1-Soft-irq
completion_nsec=[ns]: Default: 10.000ns completion_nsec=[ns]: Default: 10.000ns
Combined with irqmode=2 (timer). The time each completion event must wait. Combined with irqmode=2 (timer). The time each completion event must wait.
submit_queues=[0..nr_cpus]: submit_queues=[1..nr_cpus]:
The number of submission queues attached to the device driver. If unset, it The number of submission queues attached to the device driver. If unset, it
defaults to 1 on single-queue and bio-based instances. For multi-queue, defaults to 1. For multi-queue, it is ignored when use_per_node_hctx module
it is ignored when use_per_node_hctx module parameter is 1. parameter is 1.
hw_queue_depth=[0..qdepth]: Default: 64 hw_queue_depth=[0..qdepth]: Default: 64
The hardware queue depth of the device. The hardware queue depth of the device.