From owner-freebsd-smp Tue Dec 24 01:33:08 1996 Return-Path: Received: (from root@localhost) by freefall.freebsd.org (8.8.4/8.8.4) id BAA16539 for smp-outgoing; Tue, 24 Dec 1996 01:33:08 -0800 (PST) Received: from tfs.com (tfs.com [140.145.250.1]) by freefall.freebsd.org (8.8.4/8.8.4) with SMTP id BAA16534 for ; Tue, 24 Dec 1996 01:33:06 -0800 (PST) Received: from critter.tfs.com by tfs.com (smail3.1.28.1) with SMTP id m0vcTDt-0003vkC; Tue, 24 Dec 96 01:32 PST Received: from critter.tfs.com (localhost.phk.dk [127.0.0.1]) by critter.tfs.com (8.8.2/8.8.2) with ESMTP id KAA29101; Tue, 24 Dec 1996 10:37:29 +0100 (MET) To: Erich Boleyn cc: smp@freebsd.org Subject: Re: Eureka (maybe...) (was -> Re: P6 problem idea ) In-reply-to: Your message of "Mon, 23 Dec 1996 19:32:52 PST." Date: Tue, 24 Dec 1996 10:37:28 +0100 Message-ID: <29099.851420248@critter.tfs.com> From: Poul-Henning Kamp Sender: owner-smp@freebsd.org X-Loop: FreeBSD.org Precedence: bulk In message , 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.