From mboxrd@z Thu Jan 1 00:00:00 1970 From: Suparna Bhattacharya Subject: Re: Some interesting results in the aic7xxx slowdown problem Date: Fri, 19 Aug 2005 15:24:28 +0530 Message-ID: <20050819095428.GA9130@in.ibm.com> References: <1123119347.5019.78.camel@mulgrave> <20050804061809.GA4158@in.ibm.com> <1123166928.5026.8.camel@mulgrave> Reply-To: suparna@in.ibm.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from e35.co.us.ibm.com ([32.97.110.133]:58073 "EHLO e35.co.us.ibm.com") by vger.kernel.org with ESMTP id S964815AbVHSJpX (ORCPT ); Fri, 19 Aug 2005 05:45:23 -0400 Received: from westrelay02.boulder.ibm.com (westrelay02.boulder.ibm.com [9.17.195.11]) by e35.co.us.ibm.com (8.12.10/8.12.9) with ESMTP id j7J9jE48086380 for ; Fri, 19 Aug 2005 05:45:14 -0400 Received: from d03av02.boulder.ibm.com (d03av02.boulder.ibm.com [9.17.195.168]) by westrelay02.boulder.ibm.com (8.12.10/NCO/VERS6.7) with ESMTP id j7J9inJ7527112 for ; Fri, 19 Aug 2005 03:44:49 -0600 Received: from d03av02.boulder.ibm.com (loopback [127.0.0.1]) by d03av02.boulder.ibm.com (8.12.11/8.13.3) with ESMTP id j7J9jDQl001100 for ; Fri, 19 Aug 2005 03:45:13 -0600 Content-Disposition: inline In-Reply-To: <1123166928.5026.8.camel@mulgrave> Sender: linux-scsi-owner@vger.kernel.org List-Id: linux-scsi@vger.kernel.org To: James Bottomley Cc: linux-scsi@vger.kernel.org James, I finally got around to trying out 2.6.13-rc6 which (I think) includes the AIC driver modifications to use block layer tagging. But it looks like I'm out of luck -- the system doesn't even come up now. This is what I see. ... Initializing IPsec netlink socket NET: Registered protocol family 1 NET: Registered protocol family 17 NET: Registered protocol family 15 Starting balanced_irq Using IPI Shortcut mode VFS: Cannot open root device "sda6" or unknown-block(8,6) Please append a correct "root=" boot option Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(8,6) Is this a known problem ? I do not get it if I configure the OLD aic driver instead. Some snippets from the scsi bootup messages : ... scsi0:A:11:0: Tagged Queuing enabled. Depth 32 target0:0:11: Beginning Domain Validation target0:0:11: wide asynchronous. target0:0:11: FAST-40 WIDE SCSI 80.0 MB/s ST (25 ns, offset 63) target0:0:11: Ending Domain Validation target0:0:12: asynchronous. Vendor: IBM-ESXS Model: ST318305LC !# Rev: B245 Type: Direct-Access ... ACPI: PCI Interrupt 0000:00:01.1[A] -> GSI 17 (level, low) -> IRQ 17 scsi1 : Adaptec AIC7XXX EISA/VLB/PCI SCSI HBA DRIVER, Rev 6.2.36 aic7896/97: Ultra2 Wide Channel B, SCSI Id=7, 32/253 SCBs target1:0:0: asynchronous. Vendor: IBM-ESXS Model: ST318305LC !# Rev: B245 Type: Direct-Access ANSI SCSI revision: 03 .... SCSI device sda: 35548320 512-byte hdwr sectors (18201 MB) SCSI device sda: drive cache: write through SCSI device sda: 35548320 512-byte hdwr sectors (18201 MB) SCSI device sda: drive cache: write through sda: Attached scsi disk sda at scsi0, channel 0, id 9, lun 0 SCSI device sdb: 35548320 512-byte hdwr sectors (18201 MB) .... Attached scsi generic sg0 at scsi0, channel 0, id 9, lun 0, type 0 Attached scsi generic sg1 at scsi0, channel 0, id 10, lun 0, type 0 ... Regards Suparna -- Suparna Bhattacharya (suparna@in.ibm.com) Linux Technology Center IBM Software Lab, India