Commit b12363d0 authored Nov 05, 2015 by Sathyavathi M Committed by Jens Axboe Nov 11, 2015

NVMe: Increase the max transfer size when mdts is 0



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

Signed-off-by: Sathyavathi M <sathya.m@samsung.com>
Acked-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Jens Axboe <axboe@fb.com>

parent 2dbe5495

drivers/nvme/host/pci.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -2622,6 +2622,8 @@ 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;

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