Date: Wed, 26 Aug 2015 20:57:29 +0000 (UTC) From: Christian Weisgerber <naddy@mips.inka.de> To: freebsd-questions@freebsd.org Subject: Re: How to minimize the number of writes to CF card? Message-ID: <slrnmtsa1p.2cu3.naddy@lorvorc.mips.inka.de> References: <1440496718919-6034932.post@n5.nabble.com> <55DC3FBD.8080102@FreeBSD.org> <1440500542763-6034941.post@n5.nabble.com> <55DC53A8.3020508@FreeBSD.org> <55DC55AD.9070209@FreeBSD.org>
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On 2015-08-25, Matthew Seaman <matthew@FreeBSD.org> wrote: > However, I don't think softupdates has much effect on the /number/ or > writes made to the filesystem. It's all about re-ordering writes to > ensure metadata consistency. Time to re-read Kirk's original paper. http://www.usenix.org/publications/library/proceedings/usenix99/full_papers/mckusick/mckusick.pdf See section 5. Choice quote: "Overall, 4.4BSD systems tend to require 40 percent fewer disk writes and complete tasks 25 percent more quickly than when using the default 4.4BSD fast filesystem implementation." -- Christian "naddy" Weisgerber naddy@mips.inka.de
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