From owner-freebsd-arm@FreeBSD.ORG  Mon May  5 15:51:19 2014
Return-Path: <owner-freebsd-arm@FreeBSD.ORG>
Delivered-To: freebsd-arm@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org
 [IPv6:2001:1900:2254:206a::19:1])
 (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits))
 (No client certificate requested)
 by hub.freebsd.org (Postfix) with ESMTPS id BFE6193E;
 Mon,  5 May 2014 15:51:19 +0000 (UTC)
Received: from mail-qc0-x229.google.com (mail-qc0-x229.google.com
 [IPv6:2607:f8b0:400d:c01::229])
 (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits))
 (Client CN "smtp.gmail.com",
 Issuer "Google Internet Authority G2" (verified OK))
 by mx1.freebsd.org (Postfix) with ESMTPS id 6B1D21C1F;
 Mon,  5 May 2014 15:51:19 +0000 (UTC)
Received: by mail-qc0-f169.google.com with SMTP id e16so5473876qcx.14
 for <multiple recipients>; Mon, 05 May 2014 08:51:18 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113;
 h=mime-version:sender:in-reply-to:references:date:message-id:subject
 :from:to:cc:content-type;
 bh=wEqHAT/lEJl7TRiglQt8b5mQ1+YxLOE/qYZc3AnxlDs=;
 b=pNLodv3lZKGDHFD4ARCYiWnvf8KirC6Y1i/XpKVjcyX/+3cKbXmET6lbVMKFvCXJq2
 F2jBN2uT+EGz7KrhestfIsfVuaa4QqBVHbE/QNQCE9Gssjuu/u8JnY2w0wpfJa2z0ZO8
 tOH4xIdEeEe1bDa0wYVEQdkPW6Brh0v/P2bAXMhsa1rGhMbaGChmwby9G6MmNRXCrfic
 8ktwSKGOJ+s60MfCAJLv8cz0V+hw/Px4o3C0yiY3wARVzxcT/XmVLgTR68QW/Bq3/Pe1
 O7/tCycV0RK5ZkH+2jXyOEt2lIByT5pWfPDljsQ3wuKgd2wCNmT62NXKE09/6AqPBWh3
 wrPA==
MIME-Version: 1.0
X-Received: by 10.140.104.195 with SMTP id a61mr25048910qgf.102.1399305078306; 
 Mon, 05 May 2014 08:51:18 -0700 (PDT)
Sender: adrian.chadd@gmail.com
Received: by 10.224.191.201 with HTTP; Mon, 5 May 2014 08:51:18 -0700 (PDT)
In-Reply-To: <1399304157.22079.243.camel@revolution.hippie.lan>
References: <20140425154430.GA76168@utility-01.thismonkey.com>
 <535A8AEA.1000100@selasky.org>
 <20140425204134.GA458@cicely7.cicely.de>
 <20140430091411.GA45015@utility-01.thismonkey.com>
 <5360C0A7.9010407@selasky.org>
 <1398867266.22079.51.camel@revolution.hippie.lan>
 <CAGW5k5bZ_bTQUXuzNm=tbwx3npz1_HoOR3vM8TBRVFs8zWCq-w@mail.gmail.com>
 <5362638B.1080104@selasky.org> <5363C133.2000304@selasky.org>
 <53677CB8.5000800@selasky.org>
 <CAJ-Vmo=XmH-RX6_i13NuAXhq-jTC+WedGiyOMJaPO4r014DSgw@mail.gmail.com>
 <1399303695.22079.239.camel@revolution.hippie.lan>
 <1399304157.22079.243.camel@revolution.hippie.lan>
Date: Mon, 5 May 2014 08:51:18 -0700
X-Google-Sender-Auth: XSzt2r-bS82omsygnMwrO5a3c3s
Message-ID: <CAJ-Vmok-+7+cq+Da6_C2AA7BuP5readY_Gfwwm_RF5kh4VerQA@mail.gmail.com>
Subject: Re: USB isochronous traffic with Rasberry Pi [WAS: Re: USB audio
 device on Raspberry Pi]
From: Adrian Chadd <adrian@freebsd.org>
To: Ian Lepore <ian@freebsd.org>
Content-Type: text/plain; charset=UTF-8
Cc: "freebsd-arm@freebsd.org" <freebsd-arm@freebsd.org>
X-BeenThere: freebsd-arm@freebsd.org
X-Mailman-Version: 2.1.18
Precedence: list
List-Id: "Porting FreeBSD to ARM processors." <freebsd-arm.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/options/freebsd-arm>,
 <mailto:freebsd-arm-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-arm/>
List-Post: <mailto:freebsd-arm@freebsd.org>
List-Help: <mailto:freebsd-arm-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-arm>,
 <mailto:freebsd-arm-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Mon, 05 May 2014 15:51:19 -0000

On 5 May 2014 08:35, Ian Lepore <ian@freebsd.org> wrote:

> Oh never mind, I just noticed you said KTR, not printf.

Heh.

That's why I like KTR.

I bet some devices dislike you doing the "read registers all the time"
dance. Espeically if they're on an ISA bus where it's really expensive
to do things. But yes, your point is pretty spot on.




-a