From owner-freebsd-arch@FreeBSD.ORG Mon Nov 24 23:16:58 2014 Return-Path: Delivered-To: arch@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id 00E61C64; Mon, 24 Nov 2014 23:16:57 +0000 (UTC) Received: from smtp.des.no (smtp.des.no [194.63.250.102]) by mx1.freebsd.org (Postfix) with ESMTP id AD716188; Mon, 24 Nov 2014 23:16:57 +0000 (UTC) Received: from nine.des.no (smtp.des.no [194.63.250.102]) by smtp-int.des.no (Postfix) with ESMTP id EBB02A656; Mon, 24 Nov 2014 23:16:49 +0000 (UTC) Received: by nine.des.no (Postfix, from userid 1001) id 03795122E; Tue, 25 Nov 2014 00:16:43 +0100 (CET) From: =?utf-8?Q?Dag-Erling_Sm=C3=B8rgrav?= To: Mark R V Murray Subject: Re: svn commit: r274739 - head/sys/mips/conf References: <201411200552.sAK5qnXP063073@svn.freebsd.org> <20141120084832.GE24601@funkthat.com> <20141121092245.GI99957@funkthat.com> <1416582989.1147.250.camel@revolution.hippie.lan> <026FEB8A-CA8C-472F-A8E4-DA3D0AC44B34@grondar.org> <1416596266.1147.290.camel@revolution.hippie.lan> <1416598889.1147.297.camel@revolution.hippie.lan> <86egsvueqk.fsf@nine.des.no> <1416691274.1147.339.camel@revolution.hippie.lan> <398A380D-49AF-480C-8842-8835F81EF641@grondar.org> <1416806894.1147.362.camel@revolution.hippie.lan> <18B8A926-59C0-49B4-ADA3-A11688609852@grondar.org> <1416841268.1147.386.camel@revolution.hippie.lan> Date: Tue, 25 Nov 2014 00:16:43 +0100 In-Reply-To: (Mark R. V. Murray's message of "Mon, 24 Nov 2014 19:15:22 +0000") Message-ID: <86wq6k9okk.fsf@nine.des.no> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3 (berkeley-unix) MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Cc: arch@freebsd.org, Ian Lepore X-BeenThere: freebsd-arch@freebsd.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: Discussion related to FreeBSD architecture List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 24 Nov 2014 23:16:58 -0000 Mark R V Murray writes: >> On 24 Nov 2014, at 15:01, Ian Lepore wrote: >>=20 >>=20 >> The logging change was pretty simple: >>=20 >> Index: kern/subr_bus.c > > Thanks. > >> The low number of devices is pretty typical. Sometimes there'll be >> another uart. Sometimes an i2c eeprom. > > OK - a good example of a low-entropy system then. > >> I have no idea what's up with the first 3 unchanging numbers, but I >> suspect a big part of the explanation for the other numbers is the 32KHz >> clock it's getting the numbers from. There used to be a clock running >> at about 2.8MHz, but the source code for that driver seems to have >> disappeared from FreeBSD at some point between 8.x and -current. > > What really bothers me is that these should be the difference between > 2 essentially similar numbers; times not all that far apart, yet some > of the numbers are truly massive. They're not just massive, they're preposterous, as is the fact that most of them are absolutely identical, or just one bit off, from one run to the next. My best guess is that get_cyclecount() is broken. DES --=20 Dag-Erling Sm=C3=B8rgrav - des@des.no