Date: Fri, 22 Mar 2002 15:49:16 -0800 From: Peter Wemm <peter@wemm.org> To: Terry Lambert <tlambert2@mindspring.com> Cc: ?? <pcdvd.master@msa.hinet.net>, freebsd-smp@FreeBSD.ORG Subject: Re: SMP Error in VIA 694 based bord Message-ID: <20020322234916.4E10E38CC@overcee.wemm.org> In-Reply-To: <3C9AE821.6A4B47ED@mindspring.com>
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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
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