Date: Sat, 8 Aug 2015 12:06:06 +0200 From: Willem Jan Withagen <wjw@digiware.nl> To: fs@freebsd.org Subject: Using SSDs as swap Message-ID: <55C5D48E.6010605@digiware.nl>
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one of the following commits just passed with this in the log, and it triggered again a question I've been having for some time again already. ---- Log: Enable BIO_DELETE passthru in GELI, so TRIM/UNMAP can work as expected when GELI is used on a SSD or inside virtual machine, so that guest can tell host that it is no longer using some of the storage. ----- In ZFS I slice my SSD's into log and caches, but on a a server with little memory (which can't be grown) I use a partion on each ssd as swap as well. So swappinging does not have to seek, and has faster loading time. To allocate a few GB on aan SSD to swap is not really all that painfull, given current sizes, but the speed difference with regular spindels is impressive. But the questions are: 1) Does the swap driver understand that backing-store needs a TRIM? 1a) if not would it be useful, and what would it take to implement? 2) Does the SSD "suffer" unneeded from swapping on it? Thanx, --WjW
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