From owner-freebsd-ppc@FreeBSD.ORG  Wed Sep 24 00:47:52 2008
Return-Path: <owner-freebsd-ppc@FreeBSD.ORG>
Delivered-To: ppc@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 595301065671
	for <ppc@freebsd.org>; Wed, 24 Sep 2008 00:47:52 +0000 (UTC)
	(envelope-from grehan@freebsd.org)
Received: from nagasaki.bogus.com (nagasaki.bogus.com [IPv6:2001:418:1::81])
	by mx1.freebsd.org (Postfix) with ESMTP id 3A0528FC1E
	for <ppc@freebsd.org>; Wed, 24 Sep 2008 00:47:52 +0000 (UTC)
	(envelope-from grehan@freebsd.org)
Received: from dhcp-206.nokiaip.net ([192.103.16.206]) (authenticated bits=0)
	by nagasaki.bogus.com (8.14.3/8.14.3) with ESMTP id m8O0lpwg040125
	(version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NOT);
	Wed, 24 Sep 2008 00:47:51 GMT (envelope-from grehan@freebsd.org)
Message-ID: <48D98E2C.1090606@freebsd.org>
Date: Tue, 23 Sep 2008 17:47:40 -0700
From: Peter Grehan <grehan@freebsd.org>
User-Agent: Thunderbird 2.0.0.16 (Macintosh/20080707)
MIME-Version: 1.0
To: Marcel Moolenaar <xcllnt@mac.com>
References: <675B0620-77FE-4B99-AC98-C0002F8045F7@mac.com>
In-Reply-To: <675B0620-77FE-4B99-AC98-C0002F8045F7@mac.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
X-Virus-Scanned: ClamAV 0.93.3/8319/Tue Sep 23 21:45:28 2008 on
	nagasaki.bogus.com
X-Virus-Status: Clean
Cc: ppc@freebsd.org
Subject: Re: ZFS race condition?
X-BeenThere: freebsd-ppc@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Porting FreeBSD to the PowerPC <freebsd-ppc.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-ppc>,
	<mailto:freebsd-ppc-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-ppc>
List-Post: <mailto:freebsd-ppc@freebsd.org>
List-Help: <mailto:freebsd-ppc-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-ppc>,
	<mailto:freebsd-ppc-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Wed, 24 Sep 2008 00:47:52 -0000

Hi Marcel,

> Anyone else playing with ZFS on PowerPC seeing this?

  It's on my todo list but you're a long way ahead of me :)

  You could try the 'null' stwcx in the context switch asm to flush any 
pending reservations - I think I may have sent you mail about this a 
long while back. This may result in two sections of code both thinking 
they have a lock.

later,

Peter.