From owner-freebsd-current@FreeBSD.ORG  Wed Jul  7 09:16:26 2004
Return-Path: <owner-freebsd-current@FreeBSD.ORG>
Delivered-To: freebsd-current@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id 0BC3816A4CE
	for <current@freebsd.org>; Wed,  7 Jul 2004 09:16:26 +0000 (GMT)
Received: from critter.freebsd.dk (critter.freebsd.dk [212.242.86.163])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 5185143D48
	for <current@freebsd.org>; Wed,  7 Jul 2004 09:16:25 +0000 (GMT)
	(envelope-from phk@critter.freebsd.dk)
Received: from critter.freebsd.dk (localhost.freebsd.dk [127.0.0.1])
	by critter.freebsd.dk (8.12.11/8.12.11) with ESMTP id i679GEmO033632;
	Wed, 7 Jul 2004 11:16:14 +0200 (CEST)
	(envelope-from phk@critter.freebsd.dk)
To: ticso@cicely.de
From: "Poul-Henning Kamp" <phk@phk.freebsd.dk>
In-Reply-To: Your message of "Wed, 07 Jul 2004 11:13:12 +0200."
             <20040707091311.GE12877@cicely12.cicely.de> 
Date: Wed, 07 Jul 2004 11:16:14 +0200
Message-ID: <33631.1089191774@critter.freebsd.dk>
Sender: phk@critter.freebsd.dk
cc: mycroft@netbsd.org
cc: Julian Elischer <julian@elischer.org>
cc: FreeBSD current users <current@freebsd.org>
Subject: Re: speeding up ugen by an order of magnitude. 
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: Wed, 07 Jul 2004 09:16:26 -0000

In message <20040707091311.GE12877@cicely12.cicely.de>, Bernd Walter writes:
>On Tue, Jul 06, 2004 at 04:32:28PM -0700, Julian Elischer wrote:

>What about those options:
>- limit the allocated memory to the user request so we don't take the
>  whole 128k if not reuired.
>- Do interleaving with 2 or more xfers if the read request is known to
>  take more xfers.

I would consider ugen to be a primary candidate to use physio like
I belive scsi-tape drives do ?

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.