linux-kernel - Re: [4.5-rc4 Regression] qla2xxx: Add irq affinity notification

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Date:	Mon, 11 Apr 2016 17:48:40 +0000
From:	Quinn Tran <quinn.tran@...gic.com>
To:	Joseph Salisbury <joseph.salisbury@...onical.com>
CC:	Dept-Eng QLA2xxx Upstream <qla2xxx-upstream@...gic.com>,
	"jejb@...ux.vnet.ibm.com" <jejb@...ux.vnet.ibm.com>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	linux-scsi <linux-scsi@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	"hch@....de" <hch@....de>,
	"bart.vanassche@...disk.com" <bart.vanassche@...disk.com>,
	Himanshu Madhani <himanshu.madhani@...gic.com>,
	"nab@...ux-iscsi.org" <nab@...ux-iscsi.org>
Subject: Re: [4.5-rc4 Regression] qla2xxx: Add irq affinity notification

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.salisbury@...onical.com>
Date: Monday, April 11, 2016 at 10:26 AM
To: Quinn Tran <quinn.tran@...gic.com>
Cc: Dept-Eng QLA2xxx Upstream <qla2xxx-upstream@...gic.com>, "jejb@...ux.vnet.ibm.com" <jejb@...ux.vnet.ibm.com>, "Martin K. Petersen" <martin.petersen@...cle.com>, linux-scsi <linux-scsi@...r.kernel.org>, linux-kernel <linux-kernel@...r.kernel.org>, "hch@....de" <hch@....de>, "bart.vanassche@...disk.com" <bart.vanassche@...disk.com>, Himanshu Madhani <himanshu.madhani@...gic.com>, Nicholas Bellinger <nab@...ux-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.tran@...gic.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.tran@...gic.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.tran@...gic.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.tran@...gic.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
>
>