From owner-freebsd-questions@FreeBSD.ORG  Wed Dec 13 22:28:39 2006
Return-Path: <owner-freebsd-questions@FreeBSD.ORG>
X-Original-To: freebsd-questions@freebsd.org
Delivered-To: freebsd-questions@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [69.147.83.52])
	by hub.freebsd.org (Postfix) with ESMTP id 2257816A415
	for <freebsd-questions@freebsd.org>;
	Wed, 13 Dec 2006 22:28:39 +0000 (UTC)
	(envelope-from freebsd@sopwith.solgatos.com)
Received: from schitzo.solgatos.com
	(pool-71-245-104-192.ptldor.fios.verizon.net [71.245.104.192])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 5DAD343CA1
	for <freebsd-questions@freebsd.org>;
	Wed, 13 Dec 2006 22:26:59 +0000 (GMT)
	(envelope-from freebsd@sopwith.solgatos.com)
Received: from schitzo.solgatos.com (localhost.home.localnet [127.0.0.1])
	by schitzo.solgatos.com (8.13.8/8.13.6) with ESMTP id kBDMSTL0023374
	for <freebsd-questions@freebsd.org>; Wed, 13 Dec 2006 14:28:29 -0800
Received: from sopwith.solgatos.com (uucp@localhost)
	by schitzo.solgatos.com (8.13.8/8.13.4/Submit) with UUCP id
	kBDMSTEO023367
	for freebsd-questions@freebsd.org; Wed, 13 Dec 2006 14:28:29 -0800
Received: from localhost by sopwith.solgatos.com (8.8.8/6.24)
	id WAA11949; Wed, 13 Dec 2006 22:15:53 GMT
Message-Id: <200612132215.WAA11949@sopwith.solgatos.com>
To: freebsd-questions@freebsd.org
Date: Wed, 13 Dec 2006 14:15:53 +0000
From: Dieter <freebsd@sopwith.solgatos.com>
Subject: disk I/O tuning parameters
X-BeenThere: freebsd-questions@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
Reply-To: freebsd@sopwith.solgatos.com
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: Wed, 13 Dec 2006 22:28:39 -0000

I've been experimenting with vfs.hirunningspace
and it has some interesting effects.

Is there a different, more detailed, description of
its effects (and/or similar tuning parameters) than found in
http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/configtuning-disk.html

Is there a way to limit the runningspace, bufspace, or similar parameters
on a per disk, per process, or per file basis rather than system wide?
I haven't been able to find anything.

I need a way to protect the disk I/O bandwidth of one process from
other processes.  Having its own disk, and running at rtprio is not
sufficient. (See "processes not getting fair share of available disk I/O"
thread in -questions for more details.)