istoph Hellwig; Mike
> Snitzer;
> > linux-scsi@vger.kernel.org; Hannes Reinecke; Arun Easi; Omar Sandoval;
> > Martin K . Petersen; James Bottomley; Christoph Hellwig; Don Brace;
> Peter
> > Rivera; Laurence Oberman
> > Subject: Re: [PATCH V3 8/8] scsi: megaraid: improve scsi_
ndoval;
> Martin K . Petersen; James Bottomley; Christoph Hellwig; Don Brace;
Peter
> Rivera; Laurence Oberman
> Subject: Re: [PATCH V3 8/8] scsi: megaraid: improve scsi_mq performance
via
> .host_tagset
>
> On Thu, Mar 08, 2018 at 07:06:25PM +0800, Ming Lei wrote:
> >
t; Peter
> > > Rivera; Laurence Oberman
> > > Subject: Re: [PATCH V3 8/8] scsi: megaraid: improve scsi_mq performance
> > via
> > > .host_tagset
> > >
> > > On Wed, Mar 07, 2018 at 10:58:34PM +0530, Kashyap Desai wrote:
> > > > > >
>
istoph Hellwig; Mike
> Snitzer;
> > linux-scsi@vger.kernel.org; Hannes Reinecke; Arun Easi; Omar Sandoval;
> > Martin K . Petersen; James Bottomley; Christoph Hellwig; Don Brace;
> Peter
> > Rivera; Laurence Oberman
> > Subject: Re: [PATCH V3 8/8] scsi: megaraid: improve scsi_
ndoval;
> Martin K . Petersen; James Bottomley; Christoph Hellwig; Don Brace;
Peter
> Rivera; Laurence Oberman
> Subject: Re: [PATCH V3 8/8] scsi: megaraid: improve scsi_mq performance
via
> .host_tagset
>
> On Wed, Mar 07, 2018 at 10:58:34PM +0530, Kashyap Desai wrote:
> >
On Wed, Mar 07, 2018 at 10:58:34PM +0530, Kashyap Desai wrote:
> > >
> > > Also one observation using V3 series patch. I am seeing below Affinity
> > > mapping whereas I have only 72 logical CPUs. It means we are really
> > > not going to use all reply queues.
> > > e.a If I bind fio jobs on CPU
> >
> > Also one observation using V3 series patch. I am seeing below Affinity
> > mapping whereas I have only 72 logical CPUs. It means we are really
> > not going to use all reply queues.
> > e.a If I bind fio jobs on CPU 18-20, I am seeing only one reply queue
> > is used and that may lead to
istoph Hellwig; Mike
> Snitzer;
> > linux-scsi@vger.kernel.org; Hannes Reinecke; Arun Easi; Omar Sandoval;
> > Martin K . Petersen; James Bottomley; Christoph Hellwig; Don Brace;
> Peter
> > Rivera; Laurence Oberman
> > Subject: Re: [PATCH V3 8/8] scsi: megaraid: improve scsi_
Sandoval;
> Martin K . Petersen; James Bottomley; Christoph Hellwig; Don Brace;
Peter
> Rivera; Laurence Oberman
> Subject: Re: [PATCH V3 8/8] scsi: megaraid: improve scsi_mq performance
via
> .host_tagset
>
> On Wed, Feb 28, 2018 at 08:28:48PM +0530, Kashyap Desai wrote:
> >
On Wed, Feb 28, 2018 at 08:28:48PM +0530, Kashyap Desai wrote:
> Ming -
>
> Quick testing on my setup - Performance slightly degraded (4-5% drop)for
> megaraid_sas driver with this patch. (From 1610K IOPS it goes to 1544K)
> I confirm that after applying this patch, we have #queue = #numa node.
.kernel.org; Christoph Hellwig; Mike
> > Snitzer;
> > linux-scsi@vger.kernel.org; Hannes Reinecke; Arun Easi; Omar Sandoval;
> > Martin K . Petersen; James Bottomley; Christoph Hellwig; Don Brace; Peter
> > Rivera
> > Subject: Re: [PATCH V3 8/8] scsi: megaraid: improve
s Reinecke; Arun Easi; Omar Sandoval;
> Martin K . Petersen; James Bottomley; Christoph Hellwig; Don Brace; Peter
> Rivera
> Subject: Re: [PATCH V3 8/8] scsi: megaraid: improve scsi_mq performance
> via
> .host_tagset
>
> On Wed, 2018-02-28 at 23:21 +0800, Ming Lei wrote:
&g
On Wed, 2018-02-28 at 23:21 +0800, Ming Lei wrote:
> On Wed, Feb 28, 2018 at 08:28:48PM +0530, Kashyap Desai wrote:
> > Ming -
> >
> > Quick testing on my setup - Performance slightly degraded (4-5%
> > drop)for
> > megaraid_sas driver with this patch. (From 1610K IOPS it goes to
> > 1544K)
> >
On Wed, Feb 28, 2018 at 08:28:48PM +0530, Kashyap Desai wrote:
> Ming -
>
> Quick testing on my setup - Performance slightly degraded (4-5% drop)for
> megaraid_sas driver with this patch. (From 1610K IOPS it goes to 1544K)
> I confirm that after applying this patch, we have #queue = #numa node.
; Subject: [PATCH V3 8/8] scsi: megaraid: improve scsi_mq performance via
> .host_tagset
>
> It is observed on null_blk that IOPS can be improved much by simply
making
> hw queue per NUMA node, so this patch applies the introduced
.host_tagset
> for improving performance.
>
> In re
It is observed on null_blk that IOPS can be improved much by simply making
hw queue per NUMA node, so this patch applies the introduced .host_tagset
for improving performance.
In reality, .can_queue is quite big, and NUMA node number is often small, so
each hw queue's depth should be high enough
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