From owner-freebsd-hackers@FreeBSD.ORG  Tue Sep  6 06:33:49 2005
Return-Path: <owner-freebsd-hackers@FreeBSD.ORG>
X-Original-To: freebsd-hackers@freebsd.org
Delivered-To: freebsd-hackers@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id 2E54E16A41F;
	Tue,  6 Sep 2005 06:33:49 +0000 (GMT)
	(envelope-from scottl@samsco.org)
Received: from pooker.samsco.org (pooker.samsco.org [168.103.85.57])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 9D60943D45;
	Tue,  6 Sep 2005 06:33:46 +0000 (GMT)
	(envelope-from scottl@samsco.org)
Received: from [192.168.254.11] (junior.samsco.home [192.168.254.11])
	(authenticated bits=0)
	by pooker.samsco.org (8.13.3/8.13.3) with ESMTP id j866XhYA020937;
	Tue, 6 Sep 2005 00:33:44 -0600 (MDT)
	(envelope-from scottl@samsco.org)
Message-ID: <431D3849.3050706@samsco.org>
Date: Tue, 06 Sep 2005 00:33:45 -0600
From: Scott Long <scottl@samsco.org>
User-Agent: Mozilla/5.0 (X11; U; FreeBSD i386; en-US; rv:1.7.8) Gecko/20050615
X-Accept-Language: en-us, en
MIME-Version: 1.0
To: Nikhil Dharashivkar <nikhildharashivkar@gmail.com>
References: <17db6d3a0509051000622868bc@mail.gmail.com>	
	<431C8D5B.7080309@samsco.org> <431C92F2.9090104@persistent.co.in>	
	<431C93DD.20402@samsco.org>
	<17db6d3a0509052203b1da14a@mail.gmail.com>
In-Reply-To: <17db6d3a0509052203b1da14a@mail.gmail.com>
Content-Type: text/plain; charset=us-ascii; format=flowed
Content-Transfer-Encoding: 7bit
X-Spam-Status: No, score=-2.8 required=3.8 tests=ALL_TRUSTED autolearn=failed 
	version=3.0.2
X-Spam-Checker-Version: SpamAssassin 3.0.2 (2004-11-16) on pooker.samsco.org
Cc: freebsd-hackers@freebsd.org,
	"Rajesh S. Ghanekar" <rajesh_ghanekar@persistent.co.in>,
	freebsd-scsi@freebsd.org
Subject: Re: Adding new option to ktrace
X-BeenThere: freebsd-hackers@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Technical Discussions relating to FreeBSD
	<freebsd-hackers.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>, 
	<mailto:freebsd-hackers-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-hackers>
List-Post: <mailto:freebsd-hackers@freebsd.org>
List-Help: <mailto:freebsd-hackers-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>,
	<mailto:freebsd-hackers-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Tue, 06 Sep 2005 06:33:49 -0000

Nikhil Dharashivkar wrote:
> Hi Scott and Rajesh,
>      Thanks for replying me. Basically what happend, while testing
> scsi driver on freebsd, at  some point it crashes. So, there is no way
> to know how much IO is performed. To know the IO state just before the
> driver fails, i selected ktrace to print IO information whatever i ll
> get from dastrategy routine.

You have reason to believe that certain I/O patterns cause the crash?
What driver is being used?  What is the crash?

Scott