From owner-freebsd-hackers@FreeBSD.ORG Mon Jul 28 19:24:04 2008 Return-Path: Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id DE6D71065674 for ; Mon, 28 Jul 2008 19:24:03 +0000 (UTC) (envelope-from ken@mthelicon.com) Received: from hercules.mthelicon.com (hercules.broker.freenet6.net [IPv6:2001:5c0:8fff:fffe::ae3d]) by mx1.freebsd.org (Postfix) with ESMTP id 1DE148FC13 for ; Mon, 28 Jul 2008 19:24:02 +0000 (UTC) (envelope-from ken@mthelicon.com) Received: from PortaPeg (93-152-16-141.max.managedbroadband.co.uk [93.152.16.141]) (authenticated bits=0) by hercules.mthelicon.com (8.14.2/8.14.2) with ESMTP id m6SJNwoh002511 for ; Mon, 28 Jul 2008 19:23:59 GMT (envelope-from ken@mthelicon.com) From: "Pegasus Mc Cleaft" To: Date: Mon, 28 Jul 2008 20:23:58 +0100 Message-ID: <002301c8f0e7$7cb7a1a0$7626e4e0$@com> MIME-Version: 1.0 X-Mailer: Microsoft Office Outlook 12.0 Thread-Index: Acjw53teT80sKKgJRwKNKHMiW/56RQ== Content-Language: en-gb Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Content-Filtered-By: Mailman/MimeDel 2.1.5 Subject: Kernel Memeory - AMD64 X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 28 Jul 2008 19:24:04 -0000 Hello everyone, I was wondering if you guys could comment or give guidance to the following question: By watching the threads here and also in the CVS commit group, I see there has been (or will be) a change to the way the kernel addresses memory. Specifically in its ability to use memory beyond the 2 gig boundry? At the moment, I have increased the limits on my box by adding the following to the /boot/loader.conf file: vm.kmem_size_max="1073741824" vm.kmem_size="1073741824" I did this because of ZFS and its requirements for memory (Just take a moment here to say thank you to the people involved in porting ZFS to the BSD platform. I love it! And I use it all the time on my machines) But with the recent changes to how the kernel addresses memory and its limits, am I better off removing these entries and letting the kernel grow is memory usage as needs be, or should I increase the limits further? If the answer is application specific, one of the boxes is a mysql server, Q6600 w/ 4 Gigs.. The other is a Q9450 w/ 8 Gigs of ram that serves as my desktop machine (xorg, kde, kdevelop, etc) Thank you in advance for your comment, Peg