The tags allocation is limited by the fair sharing algorithm. It hurts the performance for UFS devices, because the queue depth of general I/O is reduced by half once the UFS send a control command. Signed-off-by: Ed Tsai <ed.tsai@xxxxxxxxxxxx> --- drivers/ufs/core/ufshcd.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c index 17d7bb875fee..e96a50265285 100644 --- a/drivers/ufs/core/ufshcd.c +++ b/drivers/ufs/core/ufshcd.c @@ -5149,6 +5149,9 @@ static int ufshcd_slave_configure(struct scsi_device *sdev) blk_queue_update_dma_pad(q, PRDT_DATA_BYTE_COUNT_PAD - 1); if (hba->quirks & UFSHCD_QUIRK_4KB_DMA_ALIGNMENT) blk_queue_update_dma_alignment(q, 4096 - 1); + + blk_queue_flag_clear(QUEUE_FLAG_FAIR_TAG_SHARING, q); + /* * Block runtime-pm until all consumers are added. * Refer ufshcd_setup_links(). -- 2.18.0
