From owner-freebsd-current@FreeBSD.ORG  Wed Jul  7 23:16:27 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 8B2DE16A4CE; Wed,  7 Jul 2004 23:16:27 +0000 (GMT)
Received: from rwcrmhc11.comcast.net (rwcrmhc11.comcast.net [204.127.198.35])
	by mx1.FreeBSD.org (Postfix) with ESMTP
	id BB79043D2F; Wed,  7 Jul 2004 23:16:26 +0000 (GMT)
	(envelope-from julian@elischer.org)
Received: from interjet.elischer.org ([24.7.73.28])
          by comcast.net (rwcrmhc11) with ESMTP
          id <20040707231625013008hme9e>; Wed, 7 Jul 2004 23:16:26 +0000
Received: from localhost (localhost.elischer.org [127.0.0.1])
	by InterJet.elischer.org (8.9.1a/8.9.1) with ESMTP id QAA84092;
	Wed, 7 Jul 2004 16:16:24 -0700 (PDT)
Date: Wed, 7 Jul 2004 16:16:22 -0700 (PDT)
From: Julian Elischer <julian@elischer.org>
To: Scott Long <scottl@freebsd.org>
In-Reply-To: <20040707161618.V97786@pooker.samsco.org>
Message-ID: <Pine.BSF.4.21.0407071615260.84004-100000@InterJet.elischer.org>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=X-UNKNOWN
Content-Transfer-Encoding: QUOTED-PRINTABLE
cc: Poul-Henning Kamp <phk@phk.freebsd.dk>
cc: "Charles M. Hannum" <mycroft@netbsd.org>
cc: FreeBSD current users <current@freebsd.org>
cc: ticso@cicely.de
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 23:16:27 -0000



On Wed, 7 Jul 2004, Scott Long wrote:

> On Wed, 7 Jul 2004, Poul-Henning Kamp wrote:
> > In message <200407072129.15095.mycroft@netbsd.org>, "Charles M. Hannum"=
 writes:
> > >On Wednesday 07 July 2004 20:46, Charles M. Hannum wrote:
> > >> 1) You'll need to add an interface for assigning pipes for read and =
write,
> > >> since there may be more than just bulk pipes (and may be more than o=
ne bulk
> > >> pipe in each direction), and we only have have device node to work w=
ith.
> > >
> > >Seems I misspoke there.  That part looks fine.
> > >
> > >I think you're going to be screwed by the buffer alignment, though.  T=
his also
> > >causes some issues with umass if you're not using a bounce buffer.
> >
> > We've already had that issue with ATA for the b=F8rked Geode controller=
:
> > physio does nothing for alignment and relies on userland doing somethin=
g
> > sensible.
> >
> > I think this is pretty reasonable for the kind of hardware-near
> > work that physio is usually employed in (including if we use it for
> > ugen).
> >
> > Obviously, if the alignment is not OK, EINVAL should be returned,
> > and that means that the driver should explicitly check the alignment.
>=20
> Note that busdma can handle alignment now for loaded buffers by using
> bounce pages.

Since we have a relatively highly weighted priority on keeping this=20
code common with teh NetBSD version, how does that go for NetBSD?


>=20
> Scott
>=20