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.
In the mean time, I will download 4.5 rc4 to re-verify. Regards, Quinn Tran -----Original Message----- From: Joseph Salisbury <joseph.salisb...@canonical.com> Date: Monday, April 11, 2016 at 10:26 AM To: Quinn Tran <quinn.t...@qlogic.com> Cc: Dept-Eng QLA2xxx Upstream <qla2xxx-upstr...@qlogic.com>, "j...@linux.vnet.ibm.com" <j...@linux.vnet.ibm.com>, "Martin K. Petersen" <martin.peter...@oracle.com>, linux-scsi <linux-s...@vger.kernel.org>, linux-kernel <linux-kernel@vger.kernel.org>, "h...@lst.de" <h...@lst.de>, "bart.vanass...@sandisk.com" <bart.vanass...@sandisk.com>, Himanshu Madhani <himanshu.madh...@qlogic.com>, Nicholas Bellinger <n...@linux-iscsi.org> 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 <quinn.t...@qlogic.com> >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 <quinn.t...@qlogic.com> >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 <quinn.t...@qlogic.com> >Date: Wed Feb 10 18:59:13 2016 -0500 > > target/transport: add flag to indicate CPU Affinity is observed > >commit fb3269baf4ecc2ce6d17d4eb537080035bdf6d5b >Author: Quinn Tran <quinn.t...@qlogic.com> >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 > >
