On Fri, 18 Aug 2023 at 04:45, <Sharp.Xia@xxxxxxxxxxxx> wrote: > > From: Sharp Xia <Sharp.Xia@xxxxxxxxxxxx> > > MMC does not set readahead and uses the default VM_READAHEAD_PAGES > resulting in slower reading speed. > Use the max_req_size reported by host driver to set the optimal > I/O size to improve performance. This seems reasonable to me. However, it would be nice if you could share some performance numbers too - comparing before and after $subject patch. Kind regards Uffe > > Signed-off-by: Sharp Xia <Sharp.Xia@xxxxxxxxxxxx> > --- > drivers/mmc/core/queue.c | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/drivers/mmc/core/queue.c b/drivers/mmc/core/queue.c > index b396e3900717..fc83c4917360 100644 > --- a/drivers/mmc/core/queue.c > +++ b/drivers/mmc/core/queue.c > @@ -359,6 +359,7 @@ static void mmc_setup_queue(struct mmc_queue *mq, struct mmc_card *card) > blk_queue_bounce_limit(mq->queue, BLK_BOUNCE_HIGH); > blk_queue_max_hw_sectors(mq->queue, > min(host->max_blk_count, host->max_req_size / 512)); > + blk_queue_io_opt(mq->queue, host->max_req_size); > if (host->can_dma_map_merge) > WARN(!blk_queue_can_use_dma_map_merging(mq->queue, > mmc_dev(host)), > -- > 2.18.0 >
