Date: Tue, 7 Oct 2003 07:53:25 -0500 From: "Jacques A. Vidrine" <nectar@FreeBSD.org> To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org, cvs-all@FreeBSD.org Subject: Re: cvs commit: src/sys/i386/i386 pmap.c Message-ID: <20031007125325.GA28894@madman.celabo.org> In-Reply-To: <200310071234.h97CYbDX041049@repoman.freebsd.org> References: <200310071234.h97CYbDX041049@repoman.freebsd.org>
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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
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