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author | Matias Bjorling <m@bjorling.me> | 2013-12-18 13:41:42 +0100 |
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committer | Jens Axboe <axboe@kernel.dk> | 2013-12-19 08:09:41 -0700 |
commit | 12f8f4fc0314103d47f9b1cbc812597b8d893ce1 (patch) | |
tree | bdc15872255fd73cc1c118cda6cadd09ef0f41a1 /Documentation/block/null_blk.txt | |
parent | 0c56010c83703e1f33325838eda9a2077827b6f1 (diff) |
null_blk: documentation
Add description of module and its parameters.
Signed-off-by: Matias Bjorling <m@bjorling.me>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'Documentation/block/null_blk.txt')
-rw-r--r-- | Documentation/block/null_blk.txt | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/Documentation/block/null_blk.txt b/Documentation/block/null_blk.txt new file mode 100644 index 000000000000..9e1b047fd13d --- /dev/null +++ b/Documentation/block/null_blk.txt @@ -0,0 +1,71 @@ +Null block device driver +================================================================================ + +I. Overview + +The null block device (/dev/nullb*) is used for benchmarking the various +block-layer implementations. It emulates a block device of X gigabytes in size. +The following instances are possible: + + Single-queue block-layer + - Request-based. + - Single submission queue per device. + - Implements IO scheduling algorithms (CFQ, Deadline, noop). + Multi-queue block-layer + - Request-based. + - Configurable submission queues per device. + No block-layer (Known as bio-based) + - Bio-based. IO requests are submitted directly to the device driver. + - Directly accepts bio data structure and returns them. + +All of them has a completion queue for each core in the system. + +II. Module parameters applicable for all instances: + +queue_mode=[0-2]: Default: 2-Multi-queue + Selects which block-layer the module should instantiate with. + + 0: Bio-based. + 1: Single-queue. + 2: Multi-queue. + +home_node=[0--nr_nodes]: Default: NUMA_NO_NODE + Selects what socket the data structures is allocated from. + +gb=[Size in GB]: Default: 250GB + The size of the device reported to the system. + +bs=[Block size (in bytes)]: Default: 512 bytes + The block size reported to the system. + +nr_devices=[Num. devices]: Default: 2 + Number of block devices instantiated. They are instantiated as /dev/nullb0, + etc. + +irq_mode=[0-2]: Default: Soft-irq + The completion mode used for completing IOs to the block-layer. + + 0: None. + 1: Soft-irq. Uses ipi to complete IOs across sockets. Simulates the overhead + when IOs are issued from another socket than the home the device is + connected to. + 2: Timer: Waits a specific period (completion_nsec) for each IO before + completion. + +completion_nsec=[Num. ns]: Default: 10.000ns + Combined with irq_mode=2 (timer). The time each completion event must wait. + +submit_queues=[0..nr_cpus]: + 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, + its ignored when use_per_node_hctx module parameter is 1. + +hw_queue_depth=[0..qdepth]: Defaults: 64 + The hardware queue depth of the device. + +III: Multi-queue specific parameters + +use_per_node_hctx=[0/1]: Defaults: 1 + 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 + number of queues defined in the submit_queues parameter. |