Date: Mon, 5 Sep 2011 23:58:12 +0100 From: RW <rwmaillists@googlemail.com> To: freebsd-hackers@freebsd.org Subject: Re: Recommended amount of swap Message-ID: <20110905235812.47d8e685@gumby.homeunix.com> In-Reply-To: <20110905194857.GC9801@dan.emsphone.com> References: <CAL8FB_2vN-1uxUgLhB-gC%2BwqPx=jKo-88rMrDzJbJ5JPJoqNNA@mail.gmail.com> <20110905194857.GC9801@dan.emsphone.com>
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On Mon, 5 Sep 2011 14:48:57 -0500 Dan Nelson wrote: > In the last episode (Sep 05), Sean Hamilton said: > > What is the state of the art for the recommended amount of swap in > > FreeBSD? Both "normal" systems with 512 MB - 8 GB of RAM, and large > > database systems with around 128 - 256 GB. > > I suggest 2x RAM for systems less than 4gb or so. Anything more than > 4GB of swap is probably never going to be used, and if it is used, > you're just going to thrash your swap device. but tmpfs (and swap-backed md devices) can use substantial amounts of swap without contributing to thrashing. In some cases it may be possible to justify larger amounts of swap.
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