alinux: nvme-pci: Disable dicard zero-out functionality on Intel's P3600 NVMe disk drive
We found huge performance lost on below particular Intel's disk drive when discard zeroout functionality is enabled on it. The issue was found when we have ext4 filesystem mounted on the disk drive and started regular FIO testing. With it disabled, we don't observe performance lost any more. 81:00.0 Non-Volatile memory controller: Intel Corporation \ PCIe Data Center SSD (rev 01) This imposes to disable the discard zero-out functionality on above disk drive in order to regain the high performance that NVMe disk driver supposes to provide. Differential Revision: https://aone.alibaba-inc.com/code/D377540Signed-off-by: NWenwei Tao <wenwei.tao@linux.alibaba.com> Reviewed-by: NGavin Shan <shan.gavin@linux.alibaba.com> Signed-off-by: NJoseph Qi <joseph.qi@linux.alibaba.com> Reviewed-by: NXiaoguang Wang <xiaoguang.wang@linux.alibaba.com> Acked-by: NCaspar Zhang <caspar@linux.alibaba.com>
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