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

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> -----Original Message-----
> From: Kashyap Desai [mailto:kashyap.desai@xxxxxxxxxxxx]
> Sent: Monday, March 05, 2018 1:24 AM
> To: Laurence Oberman <loberman@xxxxxxxxxx>; Don Brace
> <don.brace@xxxxxxxxxxxxx>; Ming Lei <ming.lei@xxxxxxxxxx>
> Cc: Jens Axboe <axboe@xxxxxxxxx>; 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>;
> Peter Rivera <peter.rivera@xxxxxxxxxxxx>; Meelis Roos <mroos@xxxxxxxx>
> Subject: RE: [PATCH V3 1/8] scsi: hpsa: fix selection of reply queue
> 
> EXTERNAL EMAIL
> 
> 
> > -----Original Message-----
> > From: Laurence Oberman [mailto:loberman@xxxxxxxxxx]
> > Sent: Saturday, March 3, 2018 3:23 AM
> > To: Don Brace; Ming Lei
> > Cc: Jens Axboe; linux-block@xxxxxxxxxxxxxxx; Christoph Hellwig; Mike
> > Snitzer;
> > linux-scsi@xxxxxxxxxxxxxxx; Hannes Reinecke; Arun Easi; Omar Sandoval;
> > Martin K . Petersen; James Bottomley; Christoph Hellwig; Kashyap Desai;
> > Peter
> > Rivera; Meelis Roos
> > Subject: Re: [PATCH V3 1/8] scsi: hpsa: fix selection of reply queue
> >
> > 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
> > > >

Tests ran all weekend without issues.


> > > > 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.
> >
> > Kashyap, are you good with the v3 patchset or still concerned with
> > performance. I was getting pretty good IOPS/sec to individual SSD drives
> > set
> > up as jbod devices on the megaraid_sas.
> 
> Laurence -
> Did you find difference with/without the patch ? What was IOPs number with
> and without patch.
> It is not urgent feature, so I would like to take some time to get BRCM's
> performance team involved and do full analysis of performance run and find
> pros/cons.
> 
> Kashyap
> >
> > With larger I/O sizes like 1MB I was getting good MB/sec and not seeing a
> > measurable performance impact.
> >
> > I dont have the hardware you have to mimic your configuration.
> >
> > Thanks
> > Laurence




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