From mboxrd@z Thu Jan 1 00:00:00 1970 From: sathya.m@samsung.com (Sathyavathi M) Date: Thu, 05 Nov 2015 05:17:06 +0000 (GMT) Subject: [PATCH] Increase the max transfer size when mdts is 0 Message-ID: <78772001.550341446700625899.JavaMail.weblogic@ep2mlwas07a> Jens, Can you please pull in the below patch. Regards, Sathya ------- Original Message ------- Sender : Sathyavathi M 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 On Thu, 10 Sep 2015, Sathyavathi M wrote: > 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 Acked-by: Keith Busch 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(+) diff --git a/drivers/block/nvme-core.c b/drivers/block/nvme-core.c index b97fc3f..9bf6ea5 100644 --- a/drivers/block/nvme-core.c +++ b/drivers/block/nvme-core.c @@ -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; -- 1.9.1 Regards, Sathya