evie/android_kernel_oneplus_msm8998
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Revert "sd: Fix rw_max for devices that report an optimal xfer size"

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This reverts 'commit 9814eb7549 ("sd: Fix rw_max for devices
that report an optimal xfer size")'.
Max sectors limit for request queue(q->limits.max_sectors) is reduced
from 1024 to 16 sectors by above commit and causing performance impact
(reduced by upto 50%). Hence revert the change to fix the performance
issue observed on 8998.

Change-Id: I9abd2be6c90922ea9de818912f405e0d292a62b8
Signed-off-by: Sayali Lokhande <sayalil@codeaurora.org>
This commit is contained in:
Sayali Lokhande 2017-04-06 09:56:52 +05:30
parent a3851309db
commit 7e83faf328
2 changed files with 4 additions and 9 deletions
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8
drivers/scsi/sd.c
View file

@ -2806,10 +2806,10 @@ static int sd_revalidate_disk(struct gendisk *disk)
if (sdkp->opt_xfer_blocks &&
sdkp->opt_xfer_blocks <= dev_max &&
sdkp->opt_xfer_blocks <= SD_DEF_XFER_BLOCKS &&
logical_to_bytes(sdp, sdkp->opt_xfer_blocks) >= PAGE_CACHE_SIZE) {
q->limits.io_opt = logical_to_bytes(sdp, sdkp->opt_xfer_blocks);
rw_max = logical_to_sectors(sdp, sdkp->opt_xfer_blocks);
} else
sdkp->opt_xfer_blocks * sdp->sector_size >= PAGE_CACHE_SIZE)
rw_max = q->limits.io_opt =
sdkp->opt_xfer_blocks * sdp->sector_size;
else
rw_max = BLK_DEF_MAX_SECTORS;
/* Combine with controller limits */

5
drivers/scsi/sd.h
View file

@ -151,11 +151,6 @@ static inline sector_t logical_to_sectors(struct scsi_device *sdev, sector_t blo
return blocks << (ilog2(sdev->sector_size) - 9);
}
static inline unsigned int logical_to_bytes(struct scsi_device *sdev, sector_t blocks)
{
return blocks * sdev->sector_size;
}
/*
* A DIF-capable target device can be formatted with different
* protection schemes. Currently 0 through 3 are defined: