From mboxrd@z Thu Jan 1 00:00:00 1970 From: James Bottomley Subject: Re: Some interesting results in the aic7xxx slowdown problem Date: Mon, 29 Aug 2005 10:21:15 -0500 Message-ID: <1125328875.5089.37.camel@mulgrave> References: <1123119347.5019.78.camel@mulgrave> <20050804061809.GA4158@in.ibm.com> <1123166928.5026.8.camel@mulgrave> <20050819095428.GA9130@in.ibm.com> <1124457765.5130.13.camel@mulgrave> <20050825103943.GA7421@in.ibm.com> Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Return-path: Received: from accolon.hansenpartnership.com ([64.109.89.108]:49555 "EHLO accolon.hansenpartnership.com") by vger.kernel.org with ESMTP id S1750919AbVH2PVZ (ORCPT ); Mon, 29 Aug 2005 11:21:25 -0400 In-Reply-To: <20050825103943.GA7421@in.ibm.com> Sender: linux-scsi-owner@vger.kernel.org List-Id: linux-scsi@vger.kernel.org To: suparna@in.ibm.com Cc: SCSI Mailing List On Thu, 2005-08-25 at 16:09 +0530, Suparna Bhattacharya wrote: > On Fri, Aug 19, 2005 at 09:22:45AM -0400, James Bottomley wrote: > > On Fri, 2005-08-19 at 15:24 +0530, Suparna Bhattacharya wrote: > > > sda: > > > > Well, this line is identifying the root cause. It says that the > > partition code came up with no partitions for this device. Do any of > > your other devices come up with paritions? (as in could this be a simple > > device node transposition issue?) > > Yes, it looks like that. The ordering now seems to be id 9, 10, ... 14, 0, > 1, 2, instead of the default of id 0, 1, 2 ... Did you expect a change > in probe ordering ? > > When I switch back to the old AIC driver the ordering goes back to > default. Er, boggle! I know of no change to the new driver that could affect the target scanning order (this is target, not lun, right?). Target scan should be handled sequentially in the mid-layer (scsi_scan.c) in a for loop that runs from 0 to 15 (well shost->max_id). There is a reverse_order flag, could that be set somehow? James