From owner-freebsd-stable@FreeBSD.ORG  Tue Dec 13 00:15:17 2011
Return-Path: <owner-freebsd-stable@FreeBSD.ORG>
Delivered-To: freebsd-stable@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 8D9921065672;
	Tue, 13 Dec 2011 00:15:17 +0000 (UTC)
	(envelope-from bruce@cran.org.uk)
Received: from muon.cran.org.uk (muon.cran.org.uk
	[IPv6:2a01:348:0:15:5d59:5c40:0:1])
	by mx1.freebsd.org (Postfix) with ESMTP id E32588FC16;
	Tue, 13 Dec 2011 00:15:16 +0000 (UTC)
Received: from muon.cran.org.uk (localhost [127.0.0.1])
	by muon.cran.org.uk (Postfix) with ESMTP id 64AEAE6209;
	Tue, 13 Dec 2011 00:15:15 +0000 (GMT)
DKIM-Signature: v=1; a=rsa-sha1; c=relaxed; d=cran.org.uk; h=message-id
	:date:from:mime-version:to:cc:subject:references:in-reply-to
	:content-type:content-transfer-encoding; s=mail; bh=gJC95oEqPFyd
	PxKhOGrYzUyGTDw=; b=lxgw94TUBeTsBgWu2YSPBvEpRbjQcuqTJny+hvnZIiFU
	tHpeqewHNhRiny1zu6kxuMq9MtveVpYMV4ARIwScFH5LK/wbqs3do4spXmz+aKkU
	53to5Y0Rb5TCj5DjChXujp47CaMhTdshe6DkZOlXc6EOfhSTZZzvq5AgNt8lf64=
DomainKey-Signature: a=rsa-sha1; c=nofws; d=cran.org.uk; h=message-id
	:date:from:mime-version:to:cc:subject:references:in-reply-to
	:content-type:content-transfer-encoding; q=dns; s=mail; b=Mq2NRg
	aaRj5CQxemqhNyn9XyA4O4PRCSn1UIY2zSw8JCM6SkjRIxcya2ZbuKOMw6ShJ5Ce
	WDDQnMskQEeJF3RIQ+eyWgORWCB3/3TW1oi305p5LAIVWxNAVOcnAbBwhaa+6XMP
	KmyZZwAc3ftWGIVyez2HIur75sxN5zkzmvenI=
Received: from [192.168.1.120] (188-220-36-32.zone11.bethere.co.uk
	[188.220.36.32])
	(using TLSv1 with cipher DHE-RSA-CAMELLIA256-SHA (256/256 bits))
	(No client certificate requested)
	by muon.cran.org.uk (Postfix) with ESMTPSA id D898DE6200;
	Tue, 13 Dec 2011 00:15:14 +0000 (GMT)
Message-ID: <4EE69911.9040201@cran.org.uk>
Date: Tue, 13 Dec 2011 00:15:13 +0000
From: Bruce Cran <bruce@cran.org.uk>
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64;
	rv:8.0) Gecko/20111105 Thunderbird/8.0
MIME-Version: 1.0
To: "O. Hartmann" <ohartman@zedat.fu-berlin.de>
References: <4EE1EAFE.3070408@m5p.com> <4EE22421.9060707@gmail.com>
	<4EE6060D.5060201@mail.zedat.fu-berlin.de>
	<20111212155159.GB73597@troutmask.apl.washington.edu>
	<4EE6295B.3020308@cran.org.uk>
	<20111212170604.GA74044@troutmask.apl.washington.edu>
	<4EE692D6.5010208@zedat.fu-berlin.de>
In-Reply-To: <4EE692D6.5010208@zedat.fu-berlin.de>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
Cc: "O. Hartmann" <ohartman@mail.zedat.fu-berlin.de>,
	Current FreeBSD <freebsd-current@freebsd.org>,
	freebsd-stable@freebsd.org, freebsd-performance@freebsd.org,
	Steve Kargl <sgk@troutmask.apl.washington.edu>
Subject: Re: SCHED_ULE should not be the default
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, 13 Dec 2011 00:15:17 -0000

On 12/12/2011 23:48, O. Hartmann wrote:
> Is the tuning of kern.sched.preempt_thresh and a proper method of 
> estimating its correct value for the intended to use workload 
> documented in the manpages, maybe tuning()? I find it hard to crawl a 
> lot of pros and cons of mailing lists for evaluating a correct value 
> of this, seemingly, important tunable.

Note that I said "for example" :)
I was suggesting that there may be sysctl's that can be tweaked to 
improve performance.

-- 
Bruce Cran