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
next prev parent reply other threads:[~2016-02-11 3:35 UTC|newest]
Thread overview: 61+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <569E11EA.8000305@dev.mellanox.co.il>
2016-01-19 22:45 ` dm-multipath low performance with blk-mq Mike Snitzer
2016-01-25 21:40 ` Mike Snitzer
2016-01-25 23:37 ` [dm-devel] " Benjamin Marzinski
2016-01-26 13:29 ` Mike Snitzer
[not found] ` <56A77C21.90605@suse.de>
2016-01-26 14:47 ` Mike Snitzer
2016-01-26 14:56 ` Christoph Hellwig
2016-01-26 15:27 ` Mike Snitzer
2016-01-27 11:14 ` Sagi Grimberg
2016-01-27 17:48 ` Mike Snitzer
2016-01-27 17:51 ` Jens Axboe
2016-01-27 18:16 ` Mike Snitzer
2016-01-27 18:26 ` Jens Axboe
2016-01-27 19:14 ` Mike Snitzer
2016-01-27 19:50 ` Jens Axboe
2016-01-27 17:56 ` Sagi Grimberg
2016-01-27 18:42 ` Mike Snitzer
2016-01-27 19:49 ` Jens Axboe
2016-01-27 20:45 ` Mike Snitzer
2016-01-29 23:35 ` Mike Snitzer
2016-01-30 8:52 ` Hannes Reinecke
2016-01-30 19:12 ` Mike Snitzer
2016-02-01 6:46 ` Hannes Reinecke
2016-02-03 18:04 ` Mike Snitzer
2016-02-03 18:24 ` Mike Snitzer
2016-02-03 19:22 ` Mike Snitzer
2016-02-04 6:54 ` Hannes Reinecke
2016-02-04 13:54 ` Mike Snitzer
2016-02-04 13:58 ` Hannes Reinecke
2016-02-04 14:09 ` Mike Snitzer
2016-02-04 14:32 ` Hannes Reinecke
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 18:05 ` Mike Snitzer
2016-02-05 19:19 ` Mike Snitzer
2016-02-07 15:41 ` Sagi Grimberg
2016-02-07 16:07 ` Mike Snitzer
2016-02-07 16:42 ` Sagi Grimberg
2016-02-07 16:37 ` Bart Van Assche
2016-02-07 16:43 ` Sagi Grimberg
2016-02-07 16:53 ` Mike Snitzer
2016-02-07 16:54 ` Sagi Grimberg
2016-02-07 17:20 ` Mike Snitzer
2016-02-08 12:21 ` Sagi Grimberg
2016-02-08 14:34 ` Mike Snitzer
2016-02-09 7:50 ` Hannes Reinecke
2016-02-09 14:55 ` Mike Snitzer
2016-02-09 15:32 ` Hannes Reinecke
2016-02-10 0:45 ` Mike Snitzer
[not found] ` <20160211015030.GA4481@redhat.com>
2016-02-11 3:35 ` Mike Snitzer [this message]
2016-02-11 15:34 ` RCU-ified dm-mpath for testing/review Mike Snitzer
2016-02-12 15:18 ` Hannes Reinecke
2016-02-12 15:26 ` Mike Snitzer
2016-02-12 16:04 ` Hannes Reinecke
2016-02-12 18:00 ` Mike Snitzer
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 16:03 ` Mike Snitzer
2016-01-26 16:44 ` Christoph Hellwig
2016-01-27 2:09 ` Mike Snitzer
2016-01-27 11:10 ` Sagi Grimberg
2016-01-26 21:40 ` [dm-devel] " Benjamin Marzinski
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20160211033541.GA4900@redhat.com \
--to=snitzer@redhat.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).