From owner-freebsd-performance@FreeBSD.ORG  Fri Oct 22 01:05:36 2010
Return-Path: <owner-freebsd-performance@FreeBSD.ORG>
Delivered-To: performance@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 0E88E1065673
	for <performance@freebsd.org>; Fri, 22 Oct 2010 01:05:36 +0000 (UTC)
	(envelope-from adrian.chadd@gmail.com)
Received: from mail-ww0-f50.google.com (mail-ww0-f50.google.com [74.125.82.50])
	by mx1.freebsd.org (Postfix) with ESMTP id 95E8B8FC0C
	for <performance@freebsd.org>; Fri, 22 Oct 2010 01:05:35 +0000 (UTC)
Received: by wwb24 with SMTP id 24so239077wwb.31
	for <performance@freebsd.org>; Thu, 21 Oct 2010 18:05:34 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma;
	h=domainkey-signature:mime-version:received:sender:received
	:in-reply-to:references:date:x-google-sender-auth:message-id:subject
	:from:to:cc:content-type;
	bh=KKYC/350p8m5/5B6U7rzUi3mcS779LdwgYw2WXXZzHQ=;
	b=gvWOg8nYHAndGWXltDhY6tVsuam9dX8YAjHiOVwR7Lpxl2jBaicYP/KIw0c4mBaqCp
	TpzGraYneLhm63qAL4NFb+UgEuYIcxHX3WErsZ8RWTffzayM6R6urulNPtQ5+zTLzbzk
	1ToEBU2IpakqMMb+uAItu/Ads7JQQBn5bEEOc=
DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma;
	h=mime-version:sender:in-reply-to:references:date
	:x-google-sender-auth:message-id:subject:from:to:cc:content-type;
	b=CgO2k2Gfq/S3YRZqcSks5wc7GW8k2mhdk3vNytqVf2yE0GTdZjfh6QmbnEfl4dcKbJ
	In7Q5cbzst/S9O5wFDujrCn5Trv7bv3jAln7X8rsViCSH4yaH3Z0zzSP2OZQi1ehaDe+
	TNqTPoMYShLDKiWWcJ+ohPN89AQAm40QkseS4=
MIME-Version: 1.0
Received: by 10.216.28.204 with SMTP id g54mr10473766wea.73.1287707961763;
	Thu, 21 Oct 2010 17:39:21 -0700 (PDT)
Sender: adrian.chadd@gmail.com
Received: by 10.216.229.5 with HTTP; Thu, 21 Oct 2010 17:39:21 -0700 (PDT)
In-Reply-To: <20101021224237.GG52404@albert.catwhisker.org>
References: <20101020174854.GZ21226@albert.catwhisker.org>
	<20101021215330.GA86224@dan.emsphone.com>
	<20101021224237.GG52404@albert.catwhisker.org>
Date: Fri, 22 Oct 2010 08:39:21 +0800
X-Google-Sender-Auth: KUmt9jUgHAdI2vxfCtFkVO69X2M
Message-ID: <AANLkTi=rmHkPjoWF81iWRus+xD9jav=czCokZtK9JJH9@mail.gmail.com>
From: Adrian Chadd <adrian@freebsd.org>
To: David Wolfskill <david@catwhisker.org>
Content-Type: text/plain; charset=ISO-8859-1
Cc: performance@freebsd.org
Subject: Re: Possible evidence of performance regression for 8.1-S (vs. 7.1)
X-BeenThere: freebsd-performance@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Performance/tuning <freebsd-performance.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-performance>,
	<mailto:freebsd-performance-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-performance>
List-Post: <mailto:freebsd-performance@freebsd.org>
List-Help: <mailto:freebsd-performance-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-performance>,
	<mailto:freebsd-performance-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Fri, 22 Oct 2010 01:05:36 -0000

On 22 October 2010 06:42, David Wolfskill <david@catwhisker.org> wrote:

>> Julian's suggestion of booting the 8.1 kernel on the 7.1 OS will definitely
>> narrow down the list of suspects.
>
> I'll see about doing something along those lines, but I doubt it will be
> all that helpful, actually.

It narrows down the suspect to the kernel, rather than the userland.

The third option is that it's both kernel+userland and some way they
play badly together; let's hope it isn't that.


adrian