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Increase the max transfer size when mdts is 0

PATCH New Sathyavathi M 2 participants 2 messages Nov 5, 2015

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Sathyavathi M

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PATCH 1/1 Increase the max transfer size when mdts is 0

Jens,

Can you please pull in the below patch.

Regards,
Sathya

------- Original Message -------
Sender : Sathyavathi M<sathya.m at samsung.com> Lead Engineer/SRI-Bangalore-SSD Solutions/Samsung Electronics Date : Sep 10, 2015 20:29 (GMT+09:00)
Title : [PATCH] Increase the max transfer size when mdts is 0

Quoted 7 lines · Sathyavathi M

From: Sathyavathi M <sathya.m at samsung.com>

This patch address the issue when IO with 128KB from FIO is splitted as two parts, 124KB and 4KB due to max transfer size(127KB).This degrades the device performance.

Signed-off-by Sathyavathi M <sathya.m at samsung.com>
Acked-by Keith Busch <keith.busch at intel.com>

From: Sathyavathi M

This patch address the issue when IO with 128KB from FIO is splitted as two parts, 124KB and 4KB due to max transfer size(127KB).This degrades the device performance.

Signed-off-by Sathyavathi M

---
drivers/block/nvme-core.c | 2 ++

1 file changed, 2 insertions(+)
drivers/block/nvme-core.c +0 -0
index b97fc3f..9bf6ea5 100644
@@ -2479,6 +2479,8 @@ static int nvme_dev_add(struct nvme_dev *dev)

memcpy(dev->firmware_rev, ctrl->fr, sizeof(ctrl->fr)); if (ctrl->mdts)
dev->max_hw_sectors = 1 << (ctrl->mdts + shift - 9);
+ else
+ dev->max_hw_sectors = UINT_MAX;
if ((pdev->vendor == PCI_VENDOR_ID_INTEL) && (pdev->device == 0x0953) && ctrl->vs[3]) { unsigned int max_hw_sectors;

Signature · 6 lines
1.9.1



Regards,
Sathya