Date: Sat, 17 Nov 2012 19:50:02 -0700 (MST) From: Warren Block <wblock@wonkity.com> To: Gary Aitken <freebsd@dreamchaser.org> Cc: FreeBSD Mailing List <freebsd-questions@freebsd.org> Subject: Re: 9.0 crash, ssd or filesystem problem? Message-ID: <alpine.BSF.2.00.1211171943360.11685@wonkity.com> In-Reply-To: <50A80DCB.7030500@dreamchaser.org> References: <50A53FF1.7050806@dreamchaser.org> <alpine.BSF.2.00.1211151550050.66706@wonkity.com> <50A602AB.2060307@dreamchaser.org> <alpine.BSF.2.00.1211160746190.74281@wonkity.com> <50A66659.5040406@dreamchaser.org> <alpine.BSF.2.00.1211161142300.76158@wonkity.com> <50A6FFC0.3050902@dreamchaser.org> <alpine.BSF.2.00.1211162119450.2013@wonkity.com> <50A7EE9B.4070003@dreamchaser.org> <alpine.BSF.2.00.1211171352510.9337@wonkity.com> <50A80DCB.7030500@dreamchaser.org>
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On Sat, 17 Nov 2012, Gary Aitken wrote: >> There was a nice Sun white paper by Peter Snyder on tmpfs. It's linked on the Wikipedia tmpfs page, but Oracle has broken the link. Google has a rendered version of a PostScript copy (long URL): >> http://webcache.googleusercontent.com/search?q=cache:EXMeqvhFfrsJ:www.sun3arc.org/papers/OS/tmpfs_virtual_memory_filesystem.ps.gz+tmpfs+white+paper&cd=12&hl=en&ct=clnk&gl=us > > Thanks. > Interesting, I would have thought swap space for something in a tmpfs was > not allocated until it needed to be swapped out. As I read it, used tmpfs > space reserves space in swap. It uses VM, so tmpfs is a memory disk until you run low on memory, then it gets swapped out. But until then, it's a RAM disk, with the added benefit of not eating a fixed chunk of RAM all the time. Oh, and unless you have a very recent -STABLE or -HEAD, see http://www.freebsd.org/cgi/query-pr.cgi?pr=bin/168544
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