From owner-freebsd-arch Tue Oct 8 15:35:20 2002 Delivered-To: freebsd-arch@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 773AD37B401 for ; Tue, 8 Oct 2002 15:35:19 -0700 (PDT) Received: from avocet.mail.pas.earthlink.net (avocet.mail.pas.earthlink.net [207.217.120.50]) by mx1.FreeBSD.org (Postfix) with ESMTP id 0FBC343E6E for ; Tue, 8 Oct 2002 15:35:19 -0700 (PDT) (envelope-from tlambert2@mindspring.com) Received: from pool0137.cvx22-bradley.dialup.earthlink.net ([209.179.198.137] helo=mindspring.com) by avocet.mail.pas.earthlink.net with esmtp (Exim 3.33 #1) id 17z2wZ-0000lT-00; Tue, 08 Oct 2002 15:35:11 -0700 Message-ID: <3DA35D58.B1B5D78D@mindspring.com> Date: Tue, 08 Oct 2002 15:34:00 -0700 From: Terry Lambert X-Mailer: Mozilla 4.79 [en] (Win98; U) X-Accept-Language: en MIME-Version: 1.0 To: Nate Lawson Cc: "Vladimir B. Grebenschikov" , arch@FreeBSD.org Subject: Re: using mem above 4Gb was: swapon some regular file References: Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: owner-freebsd-arch@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG Nate Lawson wrote: > On 8 Oct 2002, Vladimir B. Grebenschikov wrote: > > Exactly, Terry is right about large number of relative-small > > network-access processes (say apaches). But there are some other cases, > > say you have some DB server with huge index, say 10Gb, I think keep > > index in RAM effective than on disk. > > It's often surprisingly effective to just access the index on disk and > tune your VM cache instead. You can lose performance by double-caching > data. PSE-36 and PAE give you access to a 36 bit address space. But you are still limited to a 32 bit *linear* address space. More RAM in a 32 bit machine, even if you can wave the appropriate entrails over the keyboard so that it's accessible to the OS, will *NOT* increase the linear address space. IMO, if you want a larger linear address space, instead of pretending you have one, buy yourself an IA64 instead. -- Terry To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-arch" in the body of the message