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blk-mq: allow 4x BLK_MAX_REQUEST_COUNT at blk_plug for multiple_queues
Limiting number of request to BLK_MAX_REQUEST_COUNT at blk_plug hurts performance for large md arrays. [1] shows resync speed of md array drops for md array with more than 16 HDDs. Fix this by allowing more request at plug queue. The multiple_queue flag is used to only apply higher limit to multiple queue cases. [1] https://lore.kernel.org/linux-raid/CAFDAVznS71BXW8Jxv6k9dXc2iR3ysX3iZRBww_rzA8WifBFxGg@mail.gmail.com/ Tested-by: Marcin Wanat <[email protected]> Signed-off-by: Song Liu <[email protected]> Signed-off-by: Jens Axboe <[email protected]>
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