From owner-freebsd-current@FreeBSD.ORG  Fri Nov  7 07:53:48 2003
Return-Path: <owner-freebsd-current@FreeBSD.ORG>
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 2C21B16A4CE
	for <current@freebsd.org>; Fri,  7 Nov 2003 07:53:48 -0800 (PST)
Received: from mail.liwing.de (mail.liwing.de [213.70.188.162])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 57C6A43FDF
	for <current@freebsd.org>; Fri,  7 Nov 2003 07:53:45 -0800 (PST)
	(envelope-from rehsack@liwing.de)
Received: (qmail 86048 invoked from network); 7 Nov 2003 15:53:42 -0000
Received: from stingray.liwing.de (HELO liwing.de) ([213.70.188.164])
          (envelope-sender <rehsack@liwing.de>)
          by mail.liwing.de (qmail-ldap-1.03) with SMTP
          for <current@freebsd.org>; 7 Nov 2003 15:53:42 -0000
Message-ID: <3FABC006.10509@liwing.de>
Date: Fri, 07 Nov 2003 15:53:42 +0000
From: Jens Rehsack <rehsack@liwing.de>
User-Agent: Mozilla/5.0 (X11; U; FreeBSD i386; en-US; rv:1.5) Gecko/20031102
X-Accept-Language: de-de, de, en-us, en
MIME-Version: 1.0
To: current@freebsd.org
Content-Type: text/plain; charset=us-ascii; format=flowed
Content-Transfer-Encoding: 7bit
Subject: New interrupt code slows hyperthreading down
X-BeenThere: freebsd-current@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
List-Id: Discussions about the use of FreeBSD-current
	<freebsd-current.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
	<mailto:freebsd-current-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-current>
List-Post: <mailto:freebsd-current@freebsd.org>
List-Help: <mailto:freebsd-current-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
	<mailto:freebsd-current-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Fri, 07 Nov 2003 15:53:48 -0000

Hi,

I recompiled my system today and when it came up again,
it was terrible slow. Using top I've seen, that there're
around 25% cpu-time is used to handle interrupts.
The kernel was configured using SMP ('cause it's a HTT
enabled CPU) and APIC. Setting machdep.hlt_logical_cpus
to 1 didn't change anything. Simply getting a few mails
(around 30) takes about 20 minutes. Most of time while
getting the mails my mozilla was in "*Giant" state,
what shouldn't be good, should it?

I've recompiled the kernel without SMP and APIC and
now the system's behaviour is more "normal". Is the
behaviour of the new interrupt code better on real
multiprocessor systems?

Regards,
-- 
Jens Rehsack