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nvme-pci: remove cq check after submission

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We always check the completion queue after submitting, but in my testing
this isn't a win even on DRAM/xpoint devices. In some cases it's
actually worse. Kill it.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Jens Axboe 2018-05-17 18:31:48 +02:00 committed by Keith Busch
parent 750dde4472
commit f9dde187fa
1 changed files with 0 additions and 2 deletions
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2
drivers/nvme/host/pci.c
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@ -69,7 +69,6 @@ MODULE_PARM_DESC(io_queue_depth, "set io queue depth, should >= 2");
struct nvme_dev;
struct nvme_queue;
static void nvme_process_cq(struct nvme_queue *nvmeq);
static void nvme_dev_disable(struct nvme_dev *dev, bool shutdown);
/*
@ -896,7 +895,6 @@ static blk_status_t nvme_queue_rq(struct blk_mq_hw_ctx *hctx,
goto out_cleanup_iod;
}
__nvme_submit_cmd(nvmeq, &cmnd);
nvme_process_cq(nvmeq);
spin_unlock_irq(&nvmeq->q_lock);
return BLK_STS_OK;
out_cleanup_iod: