From owner-freebsd-questions@FreeBSD.ORG  Mon Apr 26 09:47:44 2010
Return-Path: <owner-freebsd-questions@FreeBSD.ORG>
Delivered-To: freebsd-questions@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 0AA32106566C
	for <freebsd-questions@freebsd.org>;
	Mon, 26 Apr 2010 09:47:44 +0000 (UTC)
	(envelope-from Thomas.Sparrevohn@btinternet.com)
Received: from smtp818.mail.ukl.yahoo.com (smtp818.mail.ukl.yahoo.com
	[217.12.12.247]) by mx1.freebsd.org (Postfix) with SMTP id 4EDE68FC16
	for <freebsd-questions@freebsd.org>;
	Mon, 26 Apr 2010 09:47:42 +0000 (UTC)
Received: (qmail 46190 invoked from network); 26 Apr 2010 09:21:02 -0000
DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=btinternet.com;
	h=DKIM-Signature:Received:X-Yahoo-SMTP:X-YMail-OSG:X-Yahoo-Newman-Property:From:To:Subject:Date:User-Agent:References:In-Reply-To:MIME-Version:Content-Type:Content-Transfer-Encoding:Message-Id;
	b=AydijQLKcDgfcmxET61LX5SAt02aD9GURclDrAl+SWyy4m+PXMh0Z97dSFG3pqktsXMJdM8TkfPhvXVkZ7ThTEkHXIYDCiea3vPq9GLK5DGtwLUy55KqqXXcUQ1KjStZdUH4UcRWVPVBBZ2Ua0clKIunzxzbu6X8l5TcmfcwNHk=
	; 
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=btinternet.com; s=s1024;
	t=1272273662; bh=S+koGhnLN6QOPiuRaASMhlQusqeFF4pVetG+I7dN89Q=;
	h=Received:X-Yahoo-SMTP:X-YMail-OSG:X-Yahoo-Newman-Property:From:To:Subject:Date:User-Agent:References:In-Reply-To:MIME-Version:Content-Type:Content-Transfer-Encoding:Message-Id;
	b=sp08phYvZaTF/C93Zfw/t9yeDyrMqRVV3PWOMrMVJNGPouucbSl4hkDaa7fcDbb1/OA9x7JAJBeS3yiOB3601J3IXORh0oEBNqMmIMyR6Gx0ai8Wkt5CKSwcj5mFPzPPdpJj571cOJoSgoCMrLsEoxxYwrmA/zai641PkCO7Yy8=
Received: from w2fzz0vc03.aah-go-on.com (Thomas.Sparrevohn@86.147.161.162 with
	plain)
	by smtp818.mail.ukl.yahoo.com with SMTP; 26 Apr 2010 09:21:01 +0000 GMT
X-Yahoo-SMTP: IZRlAYqswBDptUXTX.cYc1l2h3YNYE0xlrpi4wWl.OMHg4FYv7uDnfZx6kQf
X-YMail-OSG: CYvzrS4VM1npU9TU1da.vSNksiDNg7iBwgXyv90.GTtcwNv2W8Xy.im901S8WFWhWrRRwLTeAc2OSAlsDR7UQxtt8lXsCEA8uaeE4MQ4DiGBNhej5WZVgr8ArY8xgVzhpTvlu.cdCpd4V_k00ykr5pzSsxOSx9pYPphAUVJuISjG15r8IUFMgpW5KXcJwJ1cPgoMyE05sKYAjPBnJ4FMJhZ7QZH4kn3.gdHvv2h1qJV3Mg--
X-Yahoo-Newman-Property: ymail-3
From: Thomas Sparrevohn <Thomas.Sparrevohn@btinternet.com>
To: freebsd-questions@freebsd.org
Date: Mon, 26 Apr 2010 10:20:53 +0100
User-Agent: KMail/1.12.4 (FreeBSD/9.0-CURRENT; KDE/4.3.5; amd64; ; )
References: <y2qcf9b1ee01004251503jb4791869i9a812fade17a0558@mail.gmail.com>
In-Reply-To: <y2qcf9b1ee01004251503jb4791869i9a812fade17a0558@mail.gmail.com>
MIME-Version: 1.0
Content-Type: Text/Plain;
  charset="iso-8859-1"
Content-Transfer-Encoding: 7bit
Message-Id: <201004261020.53593.Thomas.Sparrevohn@btinternet.com>
Subject: Re: ZFS scheduling
X-BeenThere: freebsd-questions@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: User questions <freebsd-questions.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>, 
	<mailto:freebsd-questions-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-questions>
List-Post: <mailto:freebsd-questions@freebsd.org>
List-Help: <mailto:freebsd-questions-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>, 
	<mailto:freebsd-questions-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Mon, 26 Apr 2010 09:47:44 -0000

On Sunday 25 April 2010 23:03:53 Dan Naumov wrote:

In regards to vfs.zfs.vdev.max_pending - I seem to recall it is set to 35 to avoid 
using up all bandwidth in the IO subsystem - would it not make more sense to
match the NCQ/TCQ values as default?

E.g. 32 or lower  for AHCI - don't know what it would be for TCQ?