Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754888AbcDKSlq (ORCPT ); Mon, 11 Apr 2016 14:41:46 -0400 Received: from youngberry.canonical.com ([91.189.89.112]:36132 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751623AbcDKSlo (ORCPT ); Mon, 11 Apr 2016 14:41:44 -0400 Subject: Re: [4.5-rc4 Regression] qla2xxx: Add irq affinity notification To: Quinn Tran References: <570BDE44.5020301@canonical.com> <32AB2218-5D39-4968-A07F-E527B0557F04@qlogic.com> Cc: Dept-Eng QLA2xxx Upstream , "jejb@linux.vnet.ibm.com" , "Martin K. Petersen" , linux-scsi , linux-kernel , "hch@lst.de" , "bart.vanassche@sandisk.com" , Himanshu Madhani , "nab@linux-iscsi.org" From: Joseph Salisbury Message-ID: <570BEFE1.6040703@canonical.com> Date: Mon, 11 Apr 2016 14:41:37 -0400 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.5.1 MIME-Version: 1.0 In-Reply-To: <32AB2218-5D39-4968-A07F-E527B0557F04@qlogic.com> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2864 Lines: 84 On 04/11/2016 01:48 PM, Quinn Tran wrote: > Joe, > > How do I get access to this specific Ubuntu kernel where the bug is found? Is there stack trace/bug report that you could share? Any data would be helpful. Thanks. The git tree for the specific Ubuntu kernel that exhibits this bug can be found here: git://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/xenial The bug can be found here, and has screen shots of the panic as well as dmesg under the "Attachments" header: http://pad.lv/1554003 Just let me know if additional debug information is needed. > > In the mean time, I will download 4.5 rc4 to re-verify. > > Regards, > Quinn Tran > > > > > > > -----Original Message----- > From: Joseph Salisbury > Date: Monday, April 11, 2016 at 10:26 AM > To: Quinn Tran > Cc: Dept-Eng QLA2xxx Upstream , "jejb@linux.vnet.ibm.com" , "Martin K. Petersen" , linux-scsi , linux-kernel , "hch@lst.de" , "bart.vanassche@sandisk.com" , Himanshu Madhani , Nicholas Bellinger > Subject: [4.5-rc4 Regression] qla2xxx: Add irq affinity notification > >> Hello Quinn, >> >> A kernel bug report was opened against Ubuntu [0]. After a kernel >> bisect, it was found that reverting the following commit resolved this bug: >> >> commit cdb898c52d1dfad4b4800b83a58b3fe5d352edde >> Author: Quinn Tran >> Date: Thu Dec 17 14:57:05 2015 -0500 >> >> qla2xxx: Add irq affinity notification >> >> >> However, the prior commit also required the following three commits to >> also be reverted: >> >> commit 5327c7dbd1a7fd980608f44789076a636e5ee5fc >> Author: Quinn Tran >> Date: Wed Feb 10 18:59:14 2016 -0500 >> >> qla2xxx: use TARGET_SCF_USE_CPUID flag to indiate CPU Affinity >> >> commit 9095adaab8c1d82707e4e9961b6ad79b62f3361b >> Author: Quinn Tran >> Date: Wed Feb 10 18:59:13 2016 -0500 >> >> target/transport: add flag to indicate CPU Affinity is observed >> >> commit fb3269baf4ecc2ce6d17d4eb537080035bdf6d5b >> Author: Quinn Tran >> Date: Thu Dec 17 14:57:06 2015 -0500 >> >> qla2xxx: Add selective command queuing >> >> >> >> The regression was introduced as of v4.5-rc4. >> >> I was hoping to get your feedback, since you are the patch author. The >> dependant reverts all look like they are improving cpu affinity, which >> would likely impact performance. Do you thing there is a way forward >> instead of the reverts, or would it be best to submit a revert request? >> >> >> Thanks, >> >> Joe >> >> >> [0] http://pad.lv/1554003 >> >>