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| author | Mike Snitzer <snitzer@redhat.com> | 2016-01-28 16:52:56 -0500 |
|---|---|---|
| committer | Mike Snitzer <snitzer@redhat.com> | 2016-02-22 12:07:10 -0500 |
| commit | faad87df4b907605815c711dca613b3e7755e0d9 (patch) | |
| tree | 61a265ebab2d4e692649361ea72c2d5716bee69d /drivers/md/dm-cache-metadata.h | |
| parent | c91852ff081561d8793d2927e55f5c5deaea6bff (diff) | |
| download | op-kernel-dev-faad87df4b907605815c711dca613b3e7755e0d9.zip op-kernel-dev-faad87df4b907605815c711dca613b3e7755e0d9.tar.gz | |
dm: add 'dm_mq_nr_hw_queues' and 'dm_mq_queue_depth' module params
Allow user to change these values via module params or sysfs.
'dm_mq_nr_hw_queues' defaults to 1 (max 32).
'dm_mq_queue_depth' defaults to 2048 (up from 64, which proved far too
small under moderate sized workloads -- the dm-multipath device would
continuously block waiting for tags (requests) to become available).
The maximum is BLK_MQ_MAX_DEPTH (currently 10240).
Keep in mind the total number of pre-allocated requests per
request-based dm-mq device is 'dm_mq_nr_hw_queues' * 'dm_mq_queue_depth'
(currently 2048).
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'drivers/md/dm-cache-metadata.h')
0 files changed, 0 insertions, 0 deletions
