From owner-freebsd-current Thu Aug 22 21:46:28 2002 Delivered-To: freebsd-current@freebsd.org Received: from mx1.FreeBSD.org (mx1.FreeBSD.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 3643637B406 for ; Thu, 22 Aug 2002 21:46:24 -0700 (PDT) Received: from HAL9000.homeunix.com (12-232-220-15.client.attbi.com [12.232.220.15]) by mx1.FreeBSD.org (Postfix) with ESMTP id 7FD0143E77 for ; Thu, 22 Aug 2002 21:46:23 -0700 (PDT) (envelope-from dschultz@uclink.Berkeley.EDU) Received: from HAL9000.homeunix.com (localhost [127.0.0.1]) by HAL9000.homeunix.com (8.12.5/8.12.5) with ESMTP id g7N4kxrK002733; Thu, 22 Aug 2002 21:46:59 -0700 (PDT) (envelope-from dschultz@uclink.Berkeley.EDU) Received: (from das@localhost) by HAL9000.homeunix.com (8.12.5/8.12.5/Submit) id g7N4kxKq002732; Thu, 22 Aug 2002 21:46:59 -0700 (PDT) (envelope-from dschultz@uclink.Berkeley.EDU) Date: Thu, 22 Aug 2002 21:46:59 -0700 From: David Schultz To: Terry Lambert Cc: Will Andrews , Peter Wemm , current@FreeBSD.ORG Subject: Re: Memory corruption in -CURRENT [was Re: Plea to committers to only commit to HEAD if you run -current {from developers@FreeBSD.org}] Message-ID: <20020823044659.GA2687@HAL9000.homeunix.com> Mail-Followup-To: Terry Lambert , Will Andrews , Peter Wemm , current@FreeBSD.ORG References: <20020822233846.GJ90596@procyon.firepipe.net> <20020823002846.BBF082A7D6@canning.wemm.org> <20020823004257.GM90596@procyon.firepipe.net> <3D6587ED.F602F06@mindspring.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <3D6587ED.F602F06@mindspring.com> Sender: owner-freebsd-current@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG Thus spake Terry Lambert : > DISABLE_PSE is a 1:6 probability; DISABLE_PG_G is a 1:100 (both > estimates, but on that order), so mixing and matching them will > not usually give any additional information. Martin got "lucky" > with his machine... it seems to require both. > > The problem is a hardware bug in most Pentium on up processors, > which gets worse in newer CPUs (P4, AMD) as they try to optimize > certain things. It's like writing ANSI C without "volatile". It sounds like you're describing a cache coherence problem. Could you elaborate or point me to a reference on this? Thanks. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message