From owner-freebsd-bugs@FreeBSD.ORG  Tue Dec 16 05:30:04 2008
Return-Path: <owner-freebsd-bugs@FreeBSD.ORG>
Delivered-To: freebsd-bugs@hub.freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id D2C581065672
	for <freebsd-bugs@hub.freebsd.org>;
	Tue, 16 Dec 2008 05:30:04 +0000 (UTC)
	(envelope-from gnats@FreeBSD.org)
Received: from freefall.freebsd.org (freefall.freebsd.org
	[IPv6:2001:4f8:fff6::28])
	by mx1.freebsd.org (Postfix) with ESMTP id BDAC08FC18
	for <freebsd-bugs@hub.freebsd.org>;
	Tue, 16 Dec 2008 05:30:04 +0000 (UTC)
	(envelope-from gnats@FreeBSD.org)
Received: from freefall.freebsd.org (gnats@localhost [127.0.0.1])
	by freefall.freebsd.org (8.14.3/8.14.3) with ESMTP id mBG5U4P6055959
	for <freebsd-bugs@freefall.freebsd.org>; Tue, 16 Dec 2008 05:30:04 GMT
	(envelope-from gnats@freefall.freebsd.org)
Received: (from gnats@localhost)
	by freefall.freebsd.org (8.14.3/8.14.3/Submit) id mBG5U4Kq055956;
	Tue, 16 Dec 2008 05:30:04 GMT (envelope-from gnats)
Date: Tue, 16 Dec 2008 05:30:04 GMT
Message-Id: <200812160530.mBG5U4Kq055956@freefall.freebsd.org>
To: freebsd-bugs@FreeBSD.org
From: Dieter <freebsd@sopwith.solgatos.com>
Cc: 
Subject: Re: kern/118093: firewire bus reset hogs CPU,
	causing data to be lost 
X-BeenThere: freebsd-bugs@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
Reply-To: Dieter <freebsd@sopwith.solgatos.com>
List-Id: Bug reports <freebsd-bugs.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-bugs>,
	<mailto:freebsd-bugs-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-bugs>
List-Post: <mailto:freebsd-bugs@freebsd.org>
List-Help: <mailto:freebsd-bugs-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-bugs>,
	<mailto:freebsd-bugs-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Tue, 16 Dec 2008 05:30:04 -0000

The following reply was made to PR kern/118093; it has been noted by GNATS.

From: Dieter <freebsd@sopwith.solgatos.com>
To: freebsd-firewire@freebsd.org, freebsd-drivers@freebsd.org
Cc: bug-followup@FreeBSD.org
Subject: Re: kern/118093: firewire bus reset hogs CPU, causing data to be lost 
Date: Sun, 14 Dec 2008 19:30:04 +0000

 I found the source of this problem.  When a firewire bus resets,
 the firewire driver prints a few lines to the console,
 using printf(9) and device_printf(9).  I suspect that these are
 running at splfw aka splimp, locking out other i/o.
 
 Commenting out the *printf() calls fixes the problem, but that
 isn't a good solution.
 
 Would changing the *printf() calls to log(9) calls be safe?
 ("safe" meaning other i/o doesn't get locked out)
 
 Ah, for the good old days when 19200 baud seemed fast...