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>

diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index 3dfc288..cb89789 100644 (file)
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -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;