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null_blk: corrections to documentation

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Randy Dunlap reported a couple of grammar errors and unfortunate usages of
socket/node/core.

Signed-off-by: Matias Bjorling <m@bjorling.me>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Matias Bjørling 2013-12-21 00:10:59 +01:00 • committed by Jens Axboe
parent d15ee6b1a4
commit 89ed05eea0
1 changed files with 10 additions and 10 deletions
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20
Documentation/block/null_blk.txt
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@ -18,7 +18,7 @@ The following instances are possible:
- Bio-based. IO requests are submitted directly to the device driver. - Bio-based. IO requests are submitted directly to the device driver.
- Directly accepts bio data structure and returns them. - Directly accepts bio data structure and returns them.
All of them has a completion queue for each core in the system. All of them have a completion queue for each core in the system.
II. Module parameters applicable for all instances: II. Module parameters applicable for all instances:
@ -30,7 +30,7 @@ queue_mode=[0-2]: Default: 2-Multi-queue
2: Multi-queue. 2: Multi-queue.
home_node=[0--nr_nodes]: Default: NUMA_NO_NODE home_node=[0--nr_nodes]: Default: NUMA_NO_NODE
Selects what socket the data structures is allocated from. Selects what CPU node the data structures are allocated from.
gb=[Size in GB]: Default: 250GB gb=[Size in GB]: Default: 250GB
The size of the device reported to the system. The size of the device reported to the system.
@ -38,34 +38,34 @@ gb=[Size in GB]: Default: 250GB
bs=[Block size (in bytes)]: Default: 512 bytes bs=[Block size (in bytes)]: Default: 512 bytes
The block size reported to the system. The block size reported to the system.
nr_devices=[Num. devices]: Default: 2 nr_devices=[Number of devices]: Default: 2
Number of block devices instantiated. They are instantiated as /dev/nullb0, Number of block devices instantiated. They are instantiated as /dev/nullb0,
etc. etc.
irq_mode=[0-2]: Default: Soft-irq irq_mode=[0-2]: Default: 1-Soft-irq
The completion mode used for completing IOs to the block-layer. The completion mode used for completing IOs to the block-layer.
0: None. 0: None.
1: Soft-irq. Uses ipi to complete IOs across sockets. Simulates the overhead 1: Soft-irq. Uses IPI to complete IOs across CPU nodes. Simulates the overhead
when IOs are issued from another socket than the home the device is when IOs are issued from another CPU node than the home the device is
connected to. connected to.
2: Timer: Waits a specific period (completion_nsec) for each IO before 2: Timer: Waits a specific period (completion_nsec) for each IO before
completion. completion.
completion_nsec=[Num. ns]: Default: 10.000ns completion_nsec=[ns]: Default: 10.000ns
Combined with irq_mode=2 (timer). The time each completion event must wait. Combined with irq_mode=2 (timer). The time each completion event must wait.
submit_queues=[0..nr_cpus]: submit_queues=[0..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 on single-queue and bio-based instances. For multi-queue,
its ignored when use_per_node_hctx module parameter is 1. it is ignored when use_per_node_hctx module parameter is 1.
hw_queue_depth=[0..qdepth]: Defaults: 64 hw_queue_depth=[0..qdepth]: Default: 64
The hardware queue depth of the device. The hardware queue depth of the device.
III: Multi-queue specific parameters III: Multi-queue specific parameters
use_per_node_hctx=[0/1]: Defaults: 1 use_per_node_hctx=[0/1]: Default: 1
If 1, the multi-queue block layer is instantiated with a hardware dispatch If 1, the multi-queue block layer is instantiated with a hardware dispatch
queue for each CPU node in the system. If 0, it is instantiated with the queue for each CPU node in the system. If 0, it is instantiated with the
number of queues defined in the submit_queues parameter. number of queues defined in the submit_queues parameter.