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Date: Sun, 10 Sep 2017 23:42:37 -0700 From: Christoph Hellwig <hch@...radead.org> To: Hao Chen <haochen@...zon.com> Cc: "Lu, Qian" <luqia@...zon.com>, "linux-xfs@...r.kernel.org" <linux-xfs@...r.kernel.org>, "darrick.wong@...cle.com" <darrick.wong@...cle.com>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, amazon-linux-kernel <amazon-linux-kernel@...zon.com> Subject: Re: XFS mounted with 'discard' option - deleting fio test files slow On Fri, Sep 08, 2017 at 04:21:52PM -0700, Hao Chen wrote: > This is expected. To get a better performance of XFS on NVMe drive, it > is advised not use use the realtime discard option. > > https://www.intel.com/content/dam/support/us/en/documents/ssdc/data-center-ssds/Intel_Linux_NVMe_Guide_330602-002.pdf Again, this will depend on your device. Intel in particular was the example in my presentation for horrible performance of the NVMe discard support - other vendors implement much better discard support, so you'll see much better results.
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