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author | Jens Axboe <axboe@fb.com> | 2015-01-22 22:07:58 +0300 |
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committer | Jens Axboe <axboe@fb.com> | 2015-01-29 20:25:34 +0300 |
commit | ac3dd5bd128b1d1ce2a037775766f39d06a4848a (patch) | |
tree | 9e6390eac98ffbbe5d7d82e6c585125ed9bba0cf /block/bsg.c | |
parent | 4ca5829ac8b1297715bf609443ade2c332f3fd0c (diff) | |
download | linux-ac3dd5bd128b1d1ce2a037775766f39d06a4848a.tar.xz |
NVMe: avoid kmalloc/kfree for smaller IO
Currently we allocate an nvme_iod for each IO, which holds the
sg list, prps, and other IO related info. Set a threshold of
2 pages and/or 8KB of data, below which we can just embed this
in the per-command pdu in blk-mq. For any IO at or below
NVME_INT_PAGES and NVME_INT_BYTES, we save a kmalloc and kfree.
For higher IOPS, this saves up to 1% of CPU time.
Signed-off-by: Jens Axboe <axboe@fb.com>
Reviewed-by: Keith Busch <keith.busch@intel.com>
Diffstat (limited to 'block/bsg.c')
0 files changed, 0 insertions, 0 deletions