From owner-freebsd-questions@FreeBSD.ORG Thu Sep 25 02:46:03 2008 Return-Path: <owner-freebsd-questions@FreeBSD.ORG> Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id DC48F1065695 for <freebsd-questions@freebsd.org>; Thu, 25 Sep 2008 02:46:03 +0000 (UTC) (envelope-from fahadullah@gmail.com) Received: from rv-out-0506.google.com (rv-out-0506.google.com [209.85.198.225]) by mx1.freebsd.org (Postfix) with ESMTP id B3B868FC12 for <freebsd-questions@freebsd.org>; Thu, 25 Sep 2008 02:46:03 +0000 (UTC) (envelope-from fahadullah@gmail.com) Received: by rv-out-0506.google.com with SMTP id b25so200859rvf.43 for <freebsd-questions@freebsd.org>; Wed, 24 Sep 2008 19:46:03 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:to :subject:mime-version:content-type; bh=UNvKe4wcSzJiR5mY+Y22rzI6ZhNygzOTQ+79pVTl3Tk=; b=nlE9qHJU9EPMDSLw+/3rKaSwnd6Jy2x/QSzIt8qgnCTv7RwAzbOlqNBf2KWRBygu0Y rznv/dWSmFw39rC+RRsi4afbDtY5HjsI2C4iTrzuZhMi5bpkwG3dMu9w46qjZZDZuo6f y3tdJWFbyoLMxx4y0HlLUOZM69kxrFpTaYaAI= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:mime-version:content-type; b=dwgqSh+CLOByamaQJHp2IsmQs4aT6wezw6d0CPQ6IBSjGzzZgGWgx+86y2jAKtYpk9 1w2Rhs97JAbyt2GgIT9atTtYWlXO8/c+Uqypp++J98i32FsRc3an7DUBkbAYrZaW/+5o TcQugsJ7DMDx3XGGjrd/1a5HpchOJV87VWXjM= Received: by 10.114.73.1 with SMTP id v1mr8909259waa.110.1222310763394; Wed, 24 Sep 2008 19:46:03 -0700 (PDT) Received: by 10.115.73.7 with HTTP; Wed, 24 Sep 2008 19:46:03 -0700 (PDT) Message-ID: <db346c9d0809241946o30fb3f61o34618740086ffded@mail.gmail.com> Date: Wed, 24 Sep 2008 19:46:03 -0700 From: "Mohd Fahadullah" <fahadullah@gmail.com> To: freebsd-questions@freebsd.org MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline X-Content-Filtered-By: Mailman/MimeDel 2.1.5 Subject: Incorrect physical memory when hw.physmem is set X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions <freebsd-questions.freebsd.org> List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>, <mailto:freebsd-questions-request@freebsd.org?subject=unsubscribe> List-Archive: <http://lists.freebsd.org/pipermail/freebsd-questions> List-Post: <mailto:freebsd-questions@freebsd.org> List-Help: <mailto:freebsd-questions-request@freebsd.org?subject=help> List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>, <mailto:freebsd-questions-request@freebsd.org?subject=subscribe> X-List-Received-Date: Thu, 25 Sep 2008 02:46:03 -0000 Hello, There is a peculiar case when physical memory limit is set through hw.physmem and Freebsd sets usable memory to much lesser value. In cases with 8 GB of RAM where the physical memory address space is remapped above 4 GB and if we set hw.physmem to 4 GB then Freebsd actually skips the segments remapped above 4 GB. So we end up with much less memory than 4 GB depending upon the memory hole in the top of 4 GB address space. I would like to know if someone else came across the same issue. Thank you, Mohd