RE: [PATCH v4 3/3] scsi: ufs: Disable fair tag sharing

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> Disable the block layer fair tag sharing algorithm because it
> significantly reduces performance of UFS devices with a maximum queue
> depth of 32.
> 
> Cc: Christoph Hellwig <hch@xxxxxx>
> Cc: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
> Cc: Ming Lei <ming.lei@xxxxxxxxxx>
> Cc: Keith Busch <kbusch@xxxxxxxxxx>
> Cc: Damien Le Moal <damien.lemoal@xxxxxxxxxxxxxxxxxx>
> Cc: Yu Kuai <yukuai1@xxxxxxxxxxxxxxx>
> Cc: Ed Tsai <ed.tsai@xxxxxxxxxxxx>
> Signed-off-by: Bart Van Assche <bvanassche@xxxxxxx>
Reviewed-by: Avri Altman <avri.altman@xxxxxxx>

> ---
>  drivers/ufs/core/ufshcd.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
> index c2df07545f96..ed04d1263e02 100644
> --- a/drivers/ufs/core/ufshcd.c
> +++ b/drivers/ufs/core/ufshcd.c
> @@ -8866,6 +8866,7 @@ static const struct scsi_host_template
> ufshcd_driver_template = {
>         .max_host_blocked       = 1,
>         .track_queue_depth      = 1,
>         .skip_settle_delay      = 1,
> +       .disable_fair_tag_sharing = 1,
>         .sdev_groups            = ufshcd_driver_groups,
>         .rpm_autosuspend_delay  = RPM_AUTOSUSPEND_DELAY_MS,
>  };




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