From owner-freebsd-hackers Tue Apr 13 10:57:56 1999 Delivered-To: freebsd-hackers@freebsd.org Received: from noc.demon.net (server.noc.demon.net [193.195.224.4]) by hub.freebsd.org (Postfix) with ESMTP id 75B2315773 for ; Tue, 13 Apr 1999 10:57:52 -0700 (PDT) (envelope-from fanf@demon.net) Received: by noc.demon.net; id SAA12839; Tue, 13 Apr 1999 18:55:32 +0100 (BST) Received: from fanf.noc.demon.net(195.11.55.83) by inside.noc.demon.net via smap (3.2) id xmap12811; Tue, 13 Apr 99 18:55:17 +0100 Received: from fanf by fanf.noc.demon.net with local (Exim 1.73 #2) id 10X7P2-00036B-00; Tue, 13 Apr 1999 18:55:16 +0100 To: hackers@freebsd.org From: Tony Finch Subject: Re: 'alternate system clock has died!' message from systat under 3.1-REL & STABLE with SMP In-Reply-To: References: <19990412190816.O23025@globix.net> Message-Id: Date: Tue, 13 Apr 1999 18:55:16 +0100 Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG Tony Finch wrote: >Marko Bukvic wrote: >> >>I've got a new Asus XG-DLS dual Xeon motherboard with two Pentium II 450MHz Xeon >>procs and if I compile in SMP support I get the following problem: >> >>After bootup, if I start top and set the delay seconds (s) to 0(zero) the cpu >>load for the top process goes all the way up, and then after a little while it >>goes all the way down and everything has the same cpu utilization of 0.00%. >> >>Then if I start systat vmstat 1, it says: >> >> The alternate system clock has died! >> Reverting to ``pigs'' display. > >We have also seen this on an Asus P2B-DS (440BX chip set) with dual >PII 450MHz (not Xeon). The problem doesn't occur with 400MHz >processors. As a guess we tried compiling a kernel with >BETTER_CLOCK_DIAGNOSTIC but we didn't get any additional diagnostics. A suggestion from Tor Egge seems to have solved the problem (although he says it's a kludge that doesn't solve it properly). We added the contents of rtcintr() to the start of clkintr() in /sys/i386/isa/clock.c. Tony. -- f.a.n.finch dot@dotat.at fanf@demon.net Arthur: "Oh, that sounds better, have you worked out the controls?" Ford: "No, we just stopped playing with them." To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message