From mboxrd@z Thu Jan 1 00:00:00 1970 From: ebiederm@xmission.com (Eric W. Biederman) Subject: Re: [RFC] [PATCH 2/2] kdump: cciss driver initialization issue fix Date: Mon, 26 Jun 2006 11:39:21 -0600 Message-ID: References: <20060623235553.2892f21a.akpm@osdl.org> <20060624111954.GA7313@in.ibm.com> <20060624043046.4e4985be.akpm@osdl.org> <20060624120836.GB7313@in.ibm.com> <20060626021100.GA12824@in.ibm.com> <20060626133504.GA8985@in.ibm.com> <20060626153239.GD8985@in.ibm.com> <20060626171659.GG8985@in.ibm.com> Mime-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Return-path: In-Reply-To: <20060626171659.GG8985@in.ibm.com> (Vivek Goyal's message of "Mon, 26 Jun 2006 13:16:59 -0400") List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: fastboot-bounces@lists.osdl.org Errors-To: fastboot-bounces@lists.osdl.org To: vgoyal@in.ibm.com Cc: Andrew Morton , Neela.Kolli@engenio.com, linux-scsi@vger.kernel.org, mike.miller@hp.com, fastboot@lists.osdl.org, linux-kernel@vger.kernel.org List-Id: linux-scsi@vger.kernel.org Vivek Goyal writes: > On Mon, Jun 26, 2006 at 10:00:55AM -0600, Eric W. Biederman wrote: > I think it does hurt. > > - I have seen the case of MPT fusion drvier. It takes significantly more > time to come up if we choose to reset the device during initialization. > One of the reasons that we wait in a tight loop for the controller to = > come up after a reset message. > > - Long back we fixed ips driver and I remember that the maintainer had > a similar issue with the reset of device. He did not want to reset the > device in normal boot because otherwise it took significantly longer > for the driver to initialize. > > - Just now Mike also confirmed that resetting the device definitely > hurts in terms of time. In the general case resets are trivial operations. In scsi land = things are different. So a solution appropriate to that domain may be appropriate. Eric