From owner-freebsd-stable@FreeBSD.ORG  Tue Jul 18 14:21:33 2006
Return-Path: <owner-freebsd-stable@FreeBSD.ORG>
X-Original-To: freebsd-stable@freebsd.org
Delivered-To: freebsd-stable@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id 6C0B916A4E1
	for <freebsd-stable@freebsd.org>; Tue, 18 Jul 2006 14:21:33 +0000 (UTC)
	(envelope-from mb@imp.ch)
Received: from pop.imp.ch (mx2.imp.ch [157.161.9.17])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 3392943D9D
	for <freebsd-stable@freebsd.org>; Tue, 18 Jul 2006 14:20:16 +0000 (GMT)
	(envelope-from mb@imp.ch)
Received: from godot.imp.ch (godot.imp.ch [157.161.4.8])
	by pop.imp.ch (8.13.7/8.13.7/Submit_imp) with ESMTP id k6IEK20Y009703; 
	Tue, 18 Jul 2006 16:20:05 +0200 (CEST) (envelope-from mb@imp.ch)
Date: Tue, 18 Jul 2006 16:20:02 +0200 (CEST)
From: Martin Blapp <mb@imp.ch>
To: David Wolfskill <david@catwhisker.org>
In-Reply-To: <20060718140707.GG66891@bunrab.catwhisker.org>
Message-ID: <20060718161104.X36995@godot.imp.ch>
References: <20060718152306.X36995@godot.imp.ch>
	<20060718155642.H36995@godot.imp.ch>
	<20060718140707.GG66891@bunrab.catwhisker.org>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed
X-Scanned-By: MIMEDefang 2.57 on 157.161.9.65
Cc: freebsd-stable@freebsd.org
Subject: Re: Please confirm: top(1) cpu time broken on FreeBSD 6.1
 (RELEASE/STABLE) SMP ?
X-BeenThere: freebsd-stable@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Production branch of FreeBSD source code <freebsd-stable.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-stable>, 
	<mailto:freebsd-stable-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-stable>
List-Post: <mailto:freebsd-stable@freebsd.org>
List-Help: <mailto:freebsd-stable-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-stable>,
	<mailto:freebsd-stable-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Tue, 18 Jul 2006 14:21:33 -0000


Hi,

Ok, seems to be a HTT issue on a untuned system.

On two boxes I get with 'sysctl -a | grep smp | grep kern.smp.cpus'
kern.smp.cpus: 4

Here I see CPU-IDs 0 and 2 in top. No other CPUs seem to be
used. Here I get the broken CPU usage.

And yes, seeting hyperthreading_allowed=1 corrects the top usage.

On two other boxes where it works I get 'sysctl -a | grep smp | grep 
kern.smp.cpus' kern.smp.cpus: 2

Here I see CPU-ID's 0 and 1 in top. Here everything works as it should.

Martin

Martin Blapp, <mb@imp.ch> <mbr@FreeBSD.org>
------------------------------------------------------------------
ImproWare AG, UNIXSP & ISP, Zurlindenstrasse 29, 4133 Pratteln, CH
Phone: +41 61 826 93 00 Fax: +41 61 826 93 01
PGP: <finger -l mbr@freebsd.org>
PGP Fingerprint: B434 53FC C87C FE7B 0A18 B84C 8686 EF22 D300 551E
------------------------------------------------------------------