This device support 64-bit DMA and therefore no IO requests needs bouncing. On 32-bit systems, blk_queue_bounce() will bounce all IO requests with high mem pages. This makes performance really really bad.
Signed-off-by: Felipe Franciosi <[email protected]> --- drivers/block/mtip32xx/mtip32xx.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/drivers/block/mtip32xx/mtip32xx.c b/drivers/block/mtip32xx/mtip32xx.c index 5160269..24c87fdb 100644 --- a/drivers/block/mtip32xx/mtip32xx.c +++ b/drivers/block/mtip32xx/mtip32xx.c @@ -4082,8 +4082,6 @@ static void mtip_make_request(struct request_queue *queue, struct bio *bio) sg = mtip_hw_get_scatterlist(dd, &tag, unaligned); if (likely(sg != NULL)) { - blk_queue_bounce(queue, &bio); - if (unlikely((bio)->bi_vcnt > MTIP_MAX_SG)) { dev_warn(&dd->pdev->dev, "Maximum number of SGL entries exceeded\n"); -- 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
