Date: Wed, 10 Dec 2003 09:41:11 -0500 From: Bill Vermillion <bv@wjv.com> To: freebsd-isp@freebds.org Cc: freebsd-hackers@freebsd.org Subject: Re: adding more ram Message-ID: <20031210144111.GC95844@wjv.com> In-Reply-To: <20031210023427.T14579@odysseus.silby.com> References: <20571.148.243.211.1.1071036438.squirrel@mail.unixmexico.com> <20031210023427.T14579@odysseus.silby.com>
next in thread | previous in thread | raw e-mail | index | archive | help
While normally not able to pour water out of a boot with instructions on the heel, on Wed, Dec 10, 2003 at 02:41 our dear friend Mike Silbersack uttered this load of codswallop: Just one slight addendum here. > I'm replying because I want to answer your real question. > <g> The notion of swap = 2 x ram is an old one, and is no > longer applicable. (Some) older VM systems used very simplistic > swapping mechanisms, which required entire processes to be > swapped, thereby requiring large amounts of swap space. FreeBSD > (and other modern OSes) page out to the swap file in increments > of 4K pages, and do so in a flexible manner. As a result, you > should always have *some* swap space to handle overload cases, > but it's not necessary to keep any specific ram to swap ratio. Systems such as the Irix I used before moving the servers to FBSD around 1996 - reserverd swap space for applications when the application started up so those needed large swap space. Often it was never used, but the design allocated it anyway. Bill -- Bill Vermillion - bv @ wjv . com
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20031210144111.GC95844>