• S
    block: recursive merge requests · bee0393c
    Shaohua Li 提交于
    In a workload, thread 1 accesses a, a+2, ..., thread 2 accesses a+1, a+3,....
    When the requests are flushed to queue, a and a+1 are merged to (a, a+1), a+2
    and a+3 too to (a+2, a+3), but (a, a+1) and (a+2, a+3) aren't merged.
    
    If we do recursive merge for such interleave access, some workloads throughput
    get improvement. A recent worload I'm checking on is swap, below change
    boostes the throughput around 5% ~ 10%.
    Signed-off-by: NShaohua Li <shli@fusionio.com>
    Signed-off-by: NJens Axboe <axboe@kernel.dk>
    bee0393c
elevator.c 23.2 KB