From owner-freebsd-current@FreeBSD.ORG  Mon Mar 15 09:17:50 2004
Return-Path: <owner-freebsd-current@FreeBSD.ORG>
Delivered-To: freebsd-current@freebsd.org
Received: from green.homeunix.org (freefall.freebsd.org [216.136.204.21])
	by hub.freebsd.org (Postfix) with ESMTP id 4827016A4CE
	for <freebsd-current@freebsd.org>;
	Mon, 15 Mar 2004 09:17:50 -0800 (PST)
Received: from green.homeunix.org (green@localhost [127.0.0.1])
	by green.homeunix.org (8.12.11/8.12.11) with ESMTP id i2FHHmWh009319;
	Mon, 15 Mar 2004 12:17:48 -0500 (EST)
	(envelope-from green@green.homeunix.org)
Received: from localhost (green@localhost)i2FHHk8R009316;
	Mon, 15 Mar 2004 12:17:47 -0500 (EST)
	(envelope-from green@green.homeunix.org)
Message-Id: <200403151717.i2FHHk8R009316@green.homeunix.org>
X-Mailer: exmh version 2.6.3 04/04/2003 with nmh-1.0.4
To: Peter Schultz <pmes@bis.midco.net>
In-Reply-To: Message from Peter Schultz <pmes@bis.midco.net> 
   of "Fri, 12 Mar 2004 13:12:41 CST." <40520BA9.4080502@bis.midco.net> 
From: "Brian F. Feldman" <green@freebsd.org>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Date: Mon, 15 Mar 2004 12:17:46 -0500
Sender: green@green.homeunix.org
cc: freebsd-current@freebsd.org
Subject: Re: [PATCH] for SCHED_ULE & libpthread issue (was Re: I like
	SCHED_4BSD) 
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: Mon, 15 Mar 2004 17:17:50 -0000

Peter Schultz <pmes@bis.midco.net> wrote:
> Taku YAMAMOTO wrote:
> > Unfortunately, due to over-optimization in sched_switch(), SCHED_ULE doesn't
> > give reasonable CPU time to the threads which are using scheduler activation.
> > 
> > Detailed analisis is described in my previous message posted to current@:
> > 	"SCHED_ULE sometimes puts P_SA processes into ksq_next unnecessarily"
> > 	<20040213063139.71298ea9.taku@cent.saitama-u.ac.jp>
> >  or
> > 	http://docs.freebsd.org/cgi/mid.cgi?20040213063139.71298ea9.taku
> > , which didn't get broader audience :(
> > 
> > Until the problem is fully addressed, I will propose following patch
> > to be applied. (the least intrusive one attached in the former message)
> > 
> 
> This patch improves interactivity under heavy load very much.

My system is VERY well-behaved using this change.  (It's 2xSMP).

-- 
Brian Fundakowski Feldman                           \'[ FreeBSD ]''''''''''\
  <> green@FreeBSD.org                               \  The Power to Serve! \
 Opinions expressed are my own.                       \,,,,,,,,,,,,,,,,,,,,,,\