linux-kernel - [PATCH 2/2] block: bump BLK_DEF_MAX

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Date:	Thu, 13 Aug 2015 14:57:57 -0400
From:	Jeff Moyer <jmoyer@...hat.com>
To:	axboe@...nel.dk, hch@...radead.org
Cc:	ed.cashin@....org, linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] block: bump BLK_DEF_MAX_SECTORS to 2560

A value of 2560 (1280k) will accommodate a 10-data-disk stripe
write with chunk size 128k.  In the testing I've done using
iozone, fio, and aio-stress across a number of different storage
devices, a value of 1280 does not show a big performance
difference from 512, but will hopefully help software RAID
setups using SATA disks, as reported by Christoph.

NOTE: drivers/block/aoe/aoeblk.c sets its own max_hw_sectors_kb to
BLK_DEF_MAX_SECTORS.  So, this patch essentially changes aeoblk to
Use a larger maximum sector size, and I did not test this.

Signed-off-by: Jeff Moyer <jmoyer@...hat.com>
---
 include/linux/blkdev.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 1fd459e1..dbc845f 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -1138,7 +1138,7 @@ extern int blk_verify_command(unsigned char *cmd, fmode_t has_write_perm);
 enum blk_default_limits {
 	BLK_MAX_SEGMENTS	= 128,
 	BLK_SAFE_MAX_SECTORS	= 255,
-	BLK_DEF_MAX_SECTORS	= 1024,
+	BLK_DEF_MAX_SECTORS	= 2560,
 	BLK_MAX_SEGMENT_SIZE	= 65536,
 	BLK_SEG_BOUNDARY_MASK	= 0xFFFFFFFFUL,
 };
-- 
1.8.3.1

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