Re: [PATCH V3 1/8] scsi: hpsa: fix selection of reply queue

[Ming Lei <ming.lei@xxxxxxxxxx>]

On Fri, Mar 02, 2018 at 04:53:21PM -0500, Laurence Oberman wrote:
> On Fri, 2018-03-02 at 15:03 +0000, Don Brace wrote:
> > > -----Original Message-----
> > > From: Laurence Oberman [mailto:loberman@xxxxxxxxxx]
> > > Sent: Friday, March 02, 2018 8:09 AM
> > > To: Ming Lei <ming.lei@xxxxxxxxxx>
> > > Cc: Don Brace <don.brace@xxxxxxxxxxxxx>; Jens Axboe <axboe@kernel.d
> > > k>;
> > > linux-block@xxxxxxxxxxxxxxx; Christoph Hellwig <hch@xxxxxxxxxxxxx>;
> > > Mike
> > > Snitzer <snitzer@xxxxxxxxxx>; linux-scsi@xxxxxxxxxxxxxxx; Hannes
> > > Reinecke
> > > <hare@xxxxxxx>; Arun Easi <arun.easi@xxxxxxxxxx>; Omar Sandoval
> > > <osandov@xxxxxx>; Martin K . Petersen <martin.petersen@xxxxxxxxxx>;
> > > James
> > > Bottomley <james.bottomley@xxxxxxxxxxxxxxxxxxxxx>; Christoph
> > > Hellwig
> > > <hch@xxxxxx>; Kashyap Desai <kashyap.desai@xxxxxxxxxxxx>; Peter
> > > Rivera
> > > <peter.rivera@xxxxxxxxxxxx>; Meelis Roos <mroos@xxxxxxxx>
> > > Subject: Re: [PATCH V3 1/8] scsi: hpsa: fix selection of reply
> > > queue
> > > 
> > > EXTERNAL EMAIL
> > > 
> > > 
> > > On Fri, 2018-03-02 at 10:16 +0800, Ming Lei wrote:
> > > > On Thu, Mar 01, 2018 at 04:19:34PM -0500, Laurence Oberman wrote:
> > > > > On Thu, 2018-03-01 at 14:01 -0500, Laurence Oberman wrote:
> > > > > > On Thu, 2018-03-01 at 16:18 +0000, Don Brace wrote:
> > > > > > > > -----Original Message-----
> > > > > > > > From: Ming Lei [mailto:ming.lei@xxxxxxxxxx]
> > > > > > > > Sent: Tuesday, February 27, 2018 4:08 AM
> > > > > > > > To: Jens Axboe <axboe@xxxxxxxxx>; linux-block@vger.kernel
> > > > > > > > .org
> > > > > > > > ;
> > > > > > > > Christoph
> > > > > > > > Hellwig <hch@xxxxxxxxxxxxx>; Mike Snitzer <snitzer@redhat
> > > > > > > > .com
> > > > > > > > > 
> > > > > > > > 
> > > > > > > > Cc: linux-scsi@xxxxxxxxxxxxxxx; Hannes Reinecke <hare@sus
> > > > > > > > e.de
> > > > > > > > > ;
> > > > > > > > 
> > > > > > > > Arun Easi
> > > > > > > > <arun.easi@xxxxxxxxxx>; Omar Sandoval <osandov@xxxxxx>;
> > > > > > > > Martin K
> > > > > > > > .
> > > > > > > > Petersen <martin.petersen@xxxxxxxxxx>; James Bottomley
> > > > > > > > <james.bottomley@xxxxxxxxxxxxxxxxxxxxx>; Christoph
> > > > > > > > Hellwig <h
> > > > > > > > ch@l
> > > > > > > > st
> > > > > > > > .de>;
> > > > > > > > Don Brace <don.brace@xxxxxxxxxxxxx>; Kashyap Desai
> > > > > > > > <kashyap.desai@xxxxxxxxxxxx>; Peter Rivera <peter.rivera@
> > > > > > > > broa
> > > > > > > > dcom
> > > > > > > > .c
> > > > > > > > om>;
> > > > > > > > Laurence Oberman <loberman@xxxxxxxxxx>; Ming Lei
> > > > > > > > <ming.lei@xxxxxxxxxx>; Meelis Roos <mroos@xxxxxxxx>
> > > > > > > > Subject: [PATCH V3 1/8] scsi: hpsa: fix selection of
> > > > > > > > reply
> > > > > > > > queue
> > > > > > > > 
> > > > 
> > > > Seems Don run into IO failure without blk-mq, could you run your
> > > > tests again
> > > > in legacy mode?
> > > > 
> > > > Thanks,
> > > > Ming
> > > 
> > > Hello Ming
> > > I ran multiple passes on Legacy and still see no issues in my test
> > > bed
> > > 
> > > BOOT_IMAGE=/vmlinuz-4.16.0-rc2.ming+ root=UUID=43f86d71-b1bf-4789-
> > > a28e-
> > > 21c6ddc90195 ro crashkernel=256M@64M log_buf_len=64M
> > > console=ttyS1,115200n8
> > > 
> > > HEAD of the git kernel I am using
> > > 
> > > 694e16f scsi: megaraid: improve scsi_mq performance via
> > > .host_tagset
> > > 793686c scsi: hpsa: improve scsi_mq performance via .host_tagset
> > > 60d5b36 block: null_blk: introduce module parameter of
> > > 'g_host_tags'
> > > 8847067 scsi: Add template flag 'host_tagset'
> > > a8fbdd6 blk-mq: introduce BLK_MQ_F_HOST_TAGS
> > > 4710fab blk-mq: introduce 'start_tag' field to 'struct blk_mq_tags'
> > > 09bb153 scsi: megaraid_sas: fix selection of reply queue
> > > 52700d8 scsi: hpsa: fix selection of reply queue
> > 
> > I checkout out Linus's tree (4.16.0-rc3+) and re-applied the above
> > patches.
> > I  and have been running 24 hours with no issues.
> > Evidently my forked copy was corrupted. 
> > 
> > So, my I/O testing has gone well. 
> > 
> > I'll run some performance numbers next.
> > 
> > Thanks,
> > Don
> 
> Unless Kashyap is not happy we need to consider getting this in to
> Linus now because we are seeing HPE servers that keep hanging now with
> the original commit now upstream.

Hi Martin,

Given both Don and Laurence have verified that patch 1 and patch 2
does fix IO hang, could you consider to merge the two first?

Thanks,
Ming