From owner-freebsd-smp Fri Mar 22 15:49:26 2002 Delivered-To: freebsd-smp@freebsd.org Received: from rwcrmhc51.attbi.com (rwcrmhc51.attbi.com [204.127.198.38]) by hub.freebsd.org (Postfix) with ESMTP id A4CC537B41A for ; Fri, 22 Mar 2002 15:49:21 -0800 (PST) Received: from peter3.wemm.org ([12.232.27.13]) by rwcrmhc51.attbi.com (InterMail vM.4.01.03.27 201-229-121-127-20010626) with ESMTP id <20020322234921.XEFL2626.rwcrmhc51.attbi.com@peter3.wemm.org> for ; Fri, 22 Mar 2002 23:49:21 +0000 Received: from overcee.wemm.org (overcee.wemm.org [10.0.0.3]) by peter3.wemm.org (8.11.0/8.11.0) with ESMTP id g2MNnLx80534 for ; Fri, 22 Mar 2002 15:49:21 -0800 (PST) (envelope-from peter@wemm.org) Received: from wemm.org (localhost [127.0.0.1]) by overcee.wemm.org (Postfix) with ESMTP id 4E10E38CC; Fri, 22 Mar 2002 15:49:16 -0800 (PST) (envelope-from peter@wemm.org) X-Mailer: exmh version 2.5 07/13/2001 with nmh-1.0.4 To: Terry Lambert Cc: ?? , freebsd-smp@FreeBSD.ORG Subject: Re: SMP Error in VIA 694 based bord In-Reply-To: <3C9AE821.6A4B47ED@mindspring.com> Date: Fri, 22 Mar 2002 15:49:16 -0800 From: Peter Wemm Message-Id: <20020322234916.4E10E38CC@overcee.wemm.org> Sender: owner-freebsd-smp@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.org Terry Lambert wrote: > ?? wrote: > > > > thanks to Terry, I added option DISABLE_PSE,then the smp works fine,I > > already boot over 30hrs,and running stable, thank > > you for your help. > > May I ask you? what is PSE,it seens like a cpu function? > > Thanks for posting to the list. People generally don't > believe the FreeBSD has a PSE problem, without a confirming > success report in the DISABLE_PSE case, like yours. Actually, > Satoshi Asami and the people still at ClickArray should be > able to conrim the problem as well as the workaround. Is this the one you posted about regarding interactions with PG_G and overlapping PG_PS (page size) pages and the timing of setting the CR4_PSE flag? > It is the page size extension for the use of 4M pages. > > There is a subtle bug in both Intel and AMD processors with > regard to the PSE. > > FreeBSD used to accidently work around it. Apparently, it > no longer does. > > By disabling the PSE, you prevent the use of 4M pages, which > avoids triggering the bug in the first place. > > If someone who cares about 4M pages wants to narrow down the > code change that resulted in FreeBSD no longer working around > the problem, it night be useful to seperate the use of the PSE > for the kernel from the use of the PSE for memory mapped > devices. Terry, if you're not going to give details about what the problem is, then please stop ranting on and on about this. The whole "There is a bug, and I'm not going to tell you what it is" thing is getting rather tiring. Cheers, -Peter -- Peter Wemm - peter@wemm.org; peter@FreeBSD.org; peter@yahoo-inc.com "All of this is for nothing if we don't go to the stars" - JMS/B5 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-smp" in the body of the message