linux-kernel - [PATCH 1/2] mtip32xx: Don't bounce IO requests

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Date:	Wed, 12 Mar 2014 16:05:47 +0000
From:	Felipe Franciosi <felipe@...adoxo.org>
To:	<linux-kernel@...r.kernel.org>
CC:	Jens Axboe <axboe@...nel.dk>, Sam Bradshaw <sbradshaw@...ron.com>,
	Felipe Franciosi <felipe@...adoxo.org>
Subject: [PATCH 1/2] mtip32xx: Don't bounce IO requests

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 <felipe@...adoxo.org>
---
 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

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