• Shaohua Li's avatar
    percpu_ida: make percpu_ida percpu size/batch configurable · e26b53d0
    Shaohua Li authored
    Make percpu_ida percpu size/batch configurable. The block-mq-tag will
    use it.
    
    After block-mq uses percpu_ida to manage tags, performance is improved.
    My test is done in a 2 sockets machine, 12 process cross the 2 sockets.
    So if there is lock contention or ipi, should be stressed heavily.
    Testing is done for null-blk.
    
    hw_queue_depth	nopatch iops	patch iops
    64		~800k/s		~1470k/s
    2048		~4470k/s	~4340k/s
    
    Cc: Andrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarShaohua Li <shli@fusionio.com>
    Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
    e26b53d0
percpu_ida.c 8.11 KB