Date: Tue, 7 Oct 2003 22:36:56 -0400 From: David Rhodus <drhodus@catpa.com> To: "Jacques A. Vidrine" <nectar@FreeBSD.org> Cc: cvs-all@FreeBSD.org Subject: Re: cvs commit: src/sys/i386/i386 pmap.c Message-ID: <4906E41E-F938-11D7-B905-000A959B213E@catpa.com> In-Reply-To: <20031007125325.GA28894@madman.celabo.org>
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On Tuesday, October 7, 2003, at 08:53 AM, Jacques A. Vidrine wrote: > 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'. Interesting, I was just typing a message to ask if we needed to look at applying bmilekic's work to RELENG_4. Is that being looked at as a more elegant method rather than leaving PSE turned off. -DR
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