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authorSathyavathi M <sathya.m@samsung.com>2015-11-05 12:52:28 -0700
committerJens Axboe <axboe@fb.com>2015-11-11 09:36:56 -0700
commitb12363d0a5da00c422641f3d926fffb713192ea3 (patch)
tree591c9e774d2bf3516913766ce26e90f8f3b690f9 /drivers/nvme
parent2dbe5495763612f7c1b68fc897cd28c9e22079b8 (diff)
downloadlinux-b12363d0a5da00c422641f3d926fffb713192ea3.tar.bz2
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>
Diffstat (limited to 'drivers/nvme')
-rw-r--r--drivers/nvme/host/pci.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index 3dfc28875cc3..cb89789df40c 100644
--- 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;