From owner-cvs-src@FreeBSD.ORG Tue Oct 7 05:53:27 2003 Return-Path: Delivered-To: cvs-src@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id D714716A4B3; Tue, 7 Oct 2003 05:53:27 -0700 (PDT) Received: from gw.celabo.org (gw.celabo.org [208.42.49.153]) by mx1.FreeBSD.org (Postfix) with ESMTP id 9FC5043FBF; Tue, 7 Oct 2003 05:53:26 -0700 (PDT) (envelope-from nectar@celabo.org) Received: from madman.celabo.org (madman.celabo.org [10.0.1.111]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client CN "madman.celabo.org", Issuer "celabo.org CA" (verified OK)) by gw.celabo.org (Postfix) with ESMTP id 2C20E5482B; Tue, 7 Oct 2003 07:53:26 -0500 (CDT) Received: by madman.celabo.org (Postfix, from userid 1001) id BC79E6D476; Tue, 7 Oct 2003 07:53:25 -0500 (CDT) Date: Tue, 7 Oct 2003 07:53:25 -0500 From: "Jacques A. Vidrine" To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org, cvs-all@FreeBSD.org Message-ID: <20031007125325.GA28894@madman.celabo.org> References: <200310071234.h97CYbDX041049@repoman.freebsd.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <200310071234.h97CYbDX041049@repoman.freebsd.org> X-Url: http://www.celabo.org/ User-Agent: Mutt/1.5.4i-ja.1 Subject: Re: cvs commit: src/sys/i386/i386 pmap.c X-BeenThere: cvs-src@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: CVS commit messages for the src tree List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 07 Oct 2003 12:53:28 -0000 On Tue, Oct 07, 2003 at 05:34:37AM -0700, Jacques A. Vidrine wrote: > nectar 2003/10/07 05:34:37 PDT > > FreeBSD src repository > > Modified files: (Branch: RELENG_4) > sys/i386/i386 pmap.c > Log: > Disable PSE at boot time for Pentium 4 processors. On many such CPUs, > data corruption will result otherwise. It seems that the bug is > aggravated by recent work related to PAE. > > This change was originally based on rev 1.386, but now the test for > CPU type is correct and the display of the warning is postponed until > we have initialized the kernel message buffer (e.g. for dmesg). > > peter@ believes that only certain revisions of the Pentium 4 processor > are affected. However, we are unsure which so we choose to be safe by > disabling PSE on all Pentium 4s. > > The test can be disabled entirely with NO_PSE_HACK. > > Approved by: re > > Revision Changes Path > 1.250.2.22 +34 -0 src/sys/i386/i386/pmap.c The symptoms from this bug that I experienced on an ``Intel(R) Celeron(R) CPU 2.00GHz'' system were SIGBUS and SIGSEGV during `make buildworld'. Cheers, -- Jacques Vidrine . NTT/Verio SME . FreeBSD UNIX . Heimdal nectar@celabo.org . jvidrine@verio.net . nectar@freebsd.org . nectar@kth.se