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Date: Sat, 8 Jun 2013 20:04:57 -0700
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Subject: Re: Changing the default for ZFS atime to off?
From: Xin LI <delphij@gmail.com>
To: Steven Hartland <smh@freebsd.org>
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I'd suggest implementing relative atime in VFS layer first:

https://github.com/delphij/freebsd/commit/6a199821fbdbf424027499d4a0f8f113f6943e16