From owner-freebsd-current@FreeBSD.ORG  Mon Jul  2 19:31:36 2007
Return-Path: <owner-freebsd-current@FreeBSD.ORG>
X-Original-To: freebsd-current@freebsd.org
Delivered-To: freebsd-current@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52])
	by hub.freebsd.org (Postfix) with ESMTP id C819516A41F
	for <freebsd-current@freebsd.org>; Mon,  2 Jul 2007 19:31:36 +0000 (UTC)
	(envelope-from Thomas.Sparrevohn@btinternet.com)
Received: from smtp802.mail.ird.yahoo.com (smtp802.mail.ird.yahoo.com
	[217.146.188.62])
	by mx1.freebsd.org (Postfix) with SMTP id 2235313C483
	for <freebsd-current@freebsd.org>; Mon,  2 Jul 2007 19:31:35 +0000 (UTC)
	(envelope-from Thomas.Sparrevohn@btinternet.com)
Received: (qmail 77996 invoked from network); 2 Jul 2007 19:31:33 -0000
DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=btinternet.com;
	h=Received:X-YMail-OSG:From:To:Subject:Date:User-Agent:Cc:References:In-Reply-To:MIME-Version:Content-Type:Content-Transfer-Encoding:Content-Disposition:Message-Id;
	b=sQ3O6pff2rUkXgROb4DD6JMwtxKeFPQ/Pfmadmwwdb2nh+Vw5YiBcBlwK0BF66Wmo8CZAusNFDQ5nkeQahGhmdEYa+WIm5xArFUlEgTLIcX6fH2lHM2OsP9f9dIM3NMfTcK0VuXSTGwL2lvQxYC5qrGGX83UO6An4xzhLHzkd0I=
	; 
Received: from unknown (HELO w2fzz0vc03.aah-go-on.com)
	(thomas.sparrevohn@btinternet.com@81.156.175.229 with login)
	by smtp802.mail.ird.yahoo.com with SMTP; 2 Jul 2007 19:31:33 -0000
X-YMail-OSG: _n.k2KgVM1knc8iCU2H0ky4KhmPJeUmwjucGc6IVCIDFEZectrimEvc9tdEqI_QTQYzL06rvpw--
From: Thomas Sparrevohn <Thomas.Sparrevohn@btinternet.com>
To: Jeff Roberson <jroberson@chesapeake.net>
Date: Mon, 2 Jul 2007 20:31:32 +0100
User-Agent: KMail/1.9.6
References: <20070701224452.I552@10.0.0.1>
	<200707021956.01128.Thomas.Sparrevohn@btinternet.com>
	<20070702120147.F552@10.0.0.1>
In-Reply-To: <20070702120147.F552@10.0.0.1>
MIME-Version: 1.0
Content-Type: text/plain;
  charset="iso-8859-1"
Content-Transfer-Encoding: 7bit
Content-Disposition: inline
Message-Id: <200707022031.32359.Thomas.Sparrevohn@btinternet.com>
Cc: freebsd-current@freebsd.org
Subject: Re: New SCHED_SMP diff.
X-BeenThere: freebsd-current@freebsd.org
X-Mailman-Version: 2.1.5
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: Mon, 02 Jul 2007 19:31:36 -0000

On Monday 02 July 2007 20:02:41 Jeff Roberson wrote:
> On Mon, 2 Jul 2007, Thomas Sparrevohn wrote:
> 
> >
> 
> Hi, can you try sysctl kern.sched.steal_busy=1?  Please tell me if that 
> improves things.  This will resolve short-term load imbalances by stealing 
> threads from other processors.
> 
> Thanks,
> Jeff
> 

If I enable "kern.sched.steal_busy" the system panics within a couple
of seconds with a "spin lock held to long". 

Mind you that the kernels I have use has all debugging turned off e.g. 
no WITHNESS etc. so it could be that - I quite a while if I am to rerun
all tests with WITHNESS etc enabled - Do you want me to or do you have 
a suggestion as to why it panics?