Date: Tue, 24 Dec 1996 10:37:28 +0100 From: Poul-Henning Kamp <phk@critter.tfs.com> To: Erich Boleyn <erich@uruk.org> Cc: smp@freebsd.org Subject: Re: Eureka (maybe...) (was -> Re: P6 problem idea ) Message-ID: <29099.851420248@critter.tfs.com> In-Reply-To: Your message of "Mon, 23 Dec 1996 19:32:52 PST." <E0vcNbo-0003EK-00@uruk.org>
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In message <E0vcNbo-0003EK-00@uruk.org>, Erich Boleyn writes: >I tried shutting off the page global stuff, and while I don't have >a difinitively long run yet, it has run through 3 full kernel compiles >with no crash yet. I'll run it for the next 1 1/2 hours and see if >it lives through that. If so, I think we have our main culprit (I'll >also post the (small) code change which synchronizes the CPUs on TLB >shootdown before letting the sender continue). Cool! Once again proves that thinking about things far removed from computers also works :-) >All that said, I'm very surprised that this *isn't* also a serious >problem on the Pentium (the Pentium has the Page Global stuff as >well... I didn't look to see if it is used for the Pentium as well >as the Pentium Pro). Now that is an interesting thing. I wonder if there is some underlying difference in the global bit, Hmm... The P5 doesn't have a global bit, does it ? That would qualify for a "difference" to me :-) Merry Xmas! -- Poul-Henning Kamp | phk@FreeBSD.ORG FreeBSD Core-team. http://www.freebsd.org/~phk | phk@login.dknet.dk Private mailbox. whois: [PHK] | phk@tfs.com TRW Financial Systems, Inc. Power and ignorance is a disgusting cocktail.
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