From: snitzer@redhat.com (Mike Snitzer)
Subject: RCU-ified dm-mpath for testing/review
Date: Wed, 10 Feb 2016 22:35:41 -0500 [thread overview]
Message-ID: <20160211033541.GA4900@redhat.com> (raw)
In-Reply-To: <20160211015030.GA4481@redhat.com>
On Wed, Feb 10 2016 at 8:50pm -0500,
Mike Snitzer <snitzer@redhat.com> wrote:
> On Tue, Feb 09 2016 at 7:45pm -0500,
> Mike Snitzer <snitzer@redhat.com> wrote:
>
> >
> > OK, I took a crack at embracing RCU. Only slightly better performance
> > on my single NUMA node testbed. (But I'll have to track down a system
> > with multiple NUMA nodes to do any justice to the next wave of this
> > optimization effort)
> >
> > This RCU work is very heavy-handed and way too fiddley (there could
> > easily be bugs). Anyway, please see:
> > http://git.kernel.org/cgit/linux/kernel/git/snitzer/linux.git/commit/?h=devel2&id=d80a7e4f8b5be9c81e4d452137623b003fa64745
> >
> > But this might give you something to build on to arrive at something
> > more scalable?
>
> I've a bit more polished version of this work (broken up into multiple
> commits, with some fixes, etc) here:
> http://git.kernel.org/cgit/linux/kernel/git/snitzer/linux.git/log/?h=devel3
>
> Hannes and/or Sagi, if you get a chance to try this on your NUMA system
> please let me know how it goes.
FYI, with these changes my single NUMA node testbed's read IOPs went
from:
~1310K to ~1410K w/ nr_hw_queues dm-mq=4 and null_blk=4
~1330K to ~1415K w/ nr_hw_queues dm-mq=4 and null_blk=12
~1365K to ~1425K w/ nr_hw_queues dm-mq=12 and null_blk=12
WARNING: multiple messages have this Message-ID (diff)
From: Mike Snitzer <snitzer@redhat.com>
To: Hannes Reinecke <hare@suse.de>, Sagi Grimberg <sagig@dev.mellanox.co.il>
Cc: "axboe@kernel.dk" <axboe@kernel.dk>,
"linux-block@vger.kernel.org" <linux-block@vger.kernel.org>,
Christoph Hellwig <hch@infradead.org>,
"linux-nvme@lists.infradead.org" <linux-nvme@lists.infradead.org>,
"keith.busch@intel.com" <keith.busch@intel.com>,
device-mapper development <dm-devel@redhat.com>,
Bart Van Assche <bart.vanassche@sandisk.com>
Subject: Re: RCU-ified dm-mpath for testing/review
Date: Wed, 10 Feb 2016 22:35:41 -0500 [thread overview]
Message-ID: <20160211033541.GA4900@redhat.com> (raw)
In-Reply-To: <20160211015030.GA4481@redhat.com>
On Wed, Feb 10 2016 at 8:50pm -0500,
Mike Snitzer <snitzer@redhat.com> wrote:
> On Tue, Feb 09 2016 at 7:45pm -0500,
> Mike Snitzer <snitzer@redhat.com> wrote:
>
> >
> > OK, I took a crack at embracing RCU. Only slightly better performance
> > on my single NUMA node testbed. (But I'll have to track down a system
> > with multiple NUMA nodes to do any justice to the next wave of this
> > optimization effort)
> >
> > This RCU work is very heavy-handed and way too fiddley (there could
> > easily be bugs). Anyway, please see:
> > http://git.kernel.org/cgit/linux/kernel/git/snitzer/linux.git/commit/?h=devel2&id=d80a7e4f8b5be9c81e4d452137623b003fa64745
> >
> > But this might give you something to build on to arrive at something
> > more scalable?
>
> I've a bit more polished version of this work (broken up into multiple
> commits, with some fixes, etc) here:
> http://git.kernel.org/cgit/linux/kernel/git/snitzer/linux.git/log/?h=devel3
>
> Hannes and/or Sagi, if you get a chance to try this on your NUMA system
> please let me know how it goes.
FYI, with these changes my single NUMA node testbed's read IOPs went
from:
~1310K to ~1410K w/ nr_hw_queues dm-mq=4 and null_blk=4
~1330K to ~1415K w/ nr_hw_queues dm-mq=4 and null_blk=12
~1365K to ~1425K w/ nr_hw_queues dm-mq=12 and null_blk=12
next prev parent reply other threads:[~2016-02-11 3:35 UTC|newest]
Thread overview: 127+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-18 12:04 dm-multipath low performance with blk-mq Sagi Grimberg
2016-01-19 10:37 ` Sagi Grimberg
2016-01-19 22:45 ` Mike Snitzer
2016-01-19 22:45 ` Mike Snitzer
2016-01-25 21:40 ` Mike Snitzer
2016-01-25 21:40 ` Mike Snitzer
2016-01-25 23:37 ` [dm-devel] " Benjamin Marzinski
2016-01-25 23:37 ` Benjamin Marzinski
2016-01-26 13:29 ` Mike Snitzer
2016-01-26 13:29 ` Mike Snitzer
2016-01-26 14:01 ` Hannes Reinecke
2016-01-26 14:47 ` Mike Snitzer
2016-01-26 14:47 ` Mike Snitzer
2016-01-26 14:56 ` Christoph Hellwig
2016-01-26 14:56 ` Christoph Hellwig
2016-01-26 15:27 ` Mike Snitzer
2016-01-26 15:27 ` Mike Snitzer
2016-01-26 15:57 ` Benjamin Marzinski
2016-01-27 11:14 ` Sagi Grimberg
2016-01-27 11:14 ` Sagi Grimberg
2016-01-27 17:48 ` Mike Snitzer
2016-01-27 17:48 ` Mike Snitzer
2016-01-27 17:51 ` Jens Axboe
2016-01-27 17:51 ` Jens Axboe
2016-01-27 18:16 ` Mike Snitzer
2016-01-27 18:16 ` Mike Snitzer
2016-01-27 18:26 ` Jens Axboe
2016-01-27 18:26 ` Jens Axboe
2016-01-27 19:14 ` Mike Snitzer
2016-01-27 19:14 ` Mike Snitzer
2016-01-27 19:50 ` Jens Axboe
2016-01-27 19:50 ` Jens Axboe
2016-01-27 17:56 ` Sagi Grimberg
2016-01-27 17:56 ` Sagi Grimberg
2016-01-27 18:42 ` Mike Snitzer
2016-01-27 18:42 ` Mike Snitzer
2016-01-27 19:49 ` Jens Axboe
2016-01-27 19:49 ` Jens Axboe
2016-01-27 20:45 ` Mike Snitzer
2016-01-27 20:45 ` Mike Snitzer
2016-01-29 23:35 ` Mike Snitzer
2016-01-29 23:35 ` Mike Snitzer
2016-01-30 8:52 ` Hannes Reinecke
2016-01-30 8:52 ` Hannes Reinecke
2016-01-30 19:12 ` Mike Snitzer
2016-01-30 19:12 ` Mike Snitzer
2016-02-01 6:46 ` Hannes Reinecke
2016-02-01 6:46 ` Hannes Reinecke
2016-02-03 18:04 ` Mike Snitzer
2016-02-03 18:04 ` Mike Snitzer
2016-02-03 18:24 ` Mike Snitzer
2016-02-03 18:24 ` Mike Snitzer
2016-02-03 19:22 ` Mike Snitzer
2016-02-03 19:22 ` Mike Snitzer
2016-02-04 6:54 ` Hannes Reinecke
2016-02-04 6:54 ` Hannes Reinecke
2016-02-04 13:54 ` Mike Snitzer
2016-02-04 13:54 ` Mike Snitzer
2016-02-04 13:58 ` Hannes Reinecke
2016-02-04 13:58 ` Hannes Reinecke
2016-02-04 14:09 ` Mike Snitzer
2016-02-04 14:09 ` Mike Snitzer
2016-02-04 14:32 ` Hannes Reinecke
2016-02-04 14:32 ` Hannes Reinecke
2016-02-04 14:44 ` Mike Snitzer
2016-02-04 14:44 ` Mike Snitzer
2016-02-05 15:13 ` [RFC PATCH] dm: fix excessive dm-mq context switching Mike Snitzer
2016-02-05 15:13 ` Mike Snitzer
2016-02-05 18:05 ` Mike Snitzer
2016-02-05 18:05 ` Mike Snitzer
2016-02-05 19:19 ` Mike Snitzer
2016-02-05 19:19 ` Mike Snitzer
2016-02-07 15:41 ` Sagi Grimberg
2016-02-07 15:41 ` Sagi Grimberg
2016-02-07 16:07 ` Mike Snitzer
2016-02-07 16:07 ` Mike Snitzer
2016-02-07 16:42 ` Sagi Grimberg
2016-02-07 16:42 ` Sagi Grimberg
2016-02-07 16:37 ` Bart Van Assche
2016-02-07 16:37 ` Bart Van Assche
2016-02-07 16:43 ` Sagi Grimberg
2016-02-07 16:43 ` Sagi Grimberg
2016-02-07 16:53 ` Mike Snitzer
2016-02-07 16:53 ` Mike Snitzer
2016-02-07 16:54 ` Sagi Grimberg
2016-02-07 16:54 ` Sagi Grimberg
2016-02-07 17:20 ` Mike Snitzer
2016-02-07 17:20 ` Mike Snitzer
2016-02-08 12:21 ` Sagi Grimberg
2016-02-08 12:21 ` Sagi Grimberg
2016-02-08 14:34 ` Mike Snitzer
2016-02-08 14:34 ` Mike Snitzer
2016-02-09 7:50 ` Hannes Reinecke
2016-02-09 7:50 ` Hannes Reinecke
2016-02-09 14:55 ` Mike Snitzer
2016-02-09 14:55 ` Mike Snitzer
2016-02-09 15:32 ` Hannes Reinecke
2016-02-09 15:32 ` Hannes Reinecke
2016-02-10 0:45 ` Mike Snitzer
2016-02-10 0:45 ` Mike Snitzer
2016-02-11 1:50 ` RCU-ified dm-mpath for testing/review Mike Snitzer
2016-02-11 3:35 ` Mike Snitzer [this message]
2016-02-11 3:35 ` Mike Snitzer
2016-02-11 15:34 ` Mike Snitzer
2016-02-11 15:34 ` Mike Snitzer
2016-02-12 15:18 ` Hannes Reinecke
2016-02-12 15:18 ` Hannes Reinecke
2016-02-12 15:26 ` Mike Snitzer
2016-02-12 15:26 ` Mike Snitzer
2016-02-12 16:04 ` Hannes Reinecke
2016-02-12 16:04 ` Hannes Reinecke
2016-02-12 18:00 ` Mike Snitzer
2016-02-12 18:00 ` Mike Snitzer
2016-02-15 6:47 ` Hannes Reinecke
2016-02-15 6:47 ` Hannes Reinecke
2016-01-26 1:49 ` [dm-devel] dm-multipath low performance with blk-mq Benjamin Marzinski
2016-01-26 1:49 ` Benjamin Marzinski
2016-01-26 16:03 ` Mike Snitzer
2016-01-26 16:03 ` Mike Snitzer
2016-01-26 16:44 ` Christoph Hellwig
2016-01-26 16:44 ` Christoph Hellwig
2016-01-27 2:09 ` Mike Snitzer
2016-01-27 2:09 ` Mike Snitzer
2016-01-27 11:10 ` Sagi Grimberg
2016-01-27 11:10 ` Sagi Grimberg
2016-01-26 21:40 ` [dm-devel] " Benjamin Marzinski
2016-01-26 21:40 ` Benjamin Marzinski
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