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authorSam Bradshaw <sbradshaw@micron.com>2014-06-06 13:28:48 -0600
committerJens Axboe <axboe@fb.com>2014-06-06 13:28:48 -0600
commitf45c40a92d2c6915a0e88ff8a947095be2ba1c8e (patch)
tree20ca1854aefee878ca5606b98cfdfe920f511b47 /block
parentf6be4fb4bcb396fc3b1c134b7863351972de081f (diff)
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mtip32xx: minor performance enhancements
This patch adds the following: 1) Compiler hinting in the fast path. 2) A prefetch of port->flags to eliminate moderate cpu stalling later in mtip_hw_submit_io(). 3) Eliminate a redundant rq_data_dir(). 4) Reorder members of driver_data to eliminate false cacheline sharing between irq_workers_active and unal_qdepth. With some workload and topology configurations, I'm seeing ~1.5% throughput improvement in small block random read benchmarks as well as improved latency std. dev. Signed-off-by: Sam Bradshaw <sbradshaw@micron.com> Add include of <linux/prefetch.h> Signed-off-by: Jens Axboe <axboe@fb.com>
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