Linux-NVME Archive on lore.kernel.org
 help / color / Atom feed
From: Ming Lei <ming.lei@redhat.com>
To: linux-nvme@lists.infradead.org
Cc: Sagi Grimberg <sagi@grimberg.me>, Long Li <longli@microsoft.com>,
	Ming Lei <ming.lei@redhat.com>, Jens Axboe <axboe@fb.com>,
	Nadolski Edmund <edmund.nadolski@intel.com>,
	Keith Busch <kbusch@kernel.org>, Christoph Hellwig <hch@lst.de>
Subject: [PATCH V3 0/2] nvme-pci: check CQ after batch submission for Microsoft device
Date: Thu, 14 Nov 2019 10:59:15 +0800
Message-ID: <20191114025917.24634-1-ming.lei@redhat.com> (raw)

Hi,

The two patches fix one performance regression on Microsoft Corporation device. The
root cause is that Microsoft device applies aggressive interrupt coalescing, so
single job fio performance drops much after we removes checking cq in
f9dde187fa92("nvme-pci: remove cq check after submission").

Turns out this issue is very specific on Microsoft device, so add
a quirk for checking CQ on this device.

V3:
	- replace spin_trylock_irqsave with spin_trylock_irq
	- fix comment on cq_lock & cq_poll_lock

V2:
	- only check CQ for Microsoft device.



Ming Lei (2):
  nvme-pci: move sq/cq_poll lock initialization into nvme_init_queue
  nvme-pci: check CQ after batch submission for Microsoft device

 drivers/nvme/host/nvme.h |  6 +++
 drivers/nvme/host/pci.c  | 98 ++++++++++++++++++++++++++++++++++------
 2 files changed, 90 insertions(+), 14 deletions(-)

Cc: Keith Busch <kbusch@kernel.org>
Cc: Jens Axboe <axboe@fb.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Sagi Grimberg <sagi@grimberg.me>
Cc: Long Li <longli@microsoft.com>
-- 
2.20.1


_______________________________________________
Linux-nvme mailing list
Linux-nvme@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-nvme

             reply index

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-14  2:59 Ming Lei [this message]
2019-11-14  2:59 ` [PATCH V3 1/2] nvme-pci: move sq/cq_poll lock initialization into nvme_init_queue Ming Lei
2019-11-14  2:59 ` [PATCH V3 2/2] nvme-pci: check CQ after batch submission for Microsoft device Ming Lei
2019-11-14  4:56   ` Keith Busch
2019-11-14  8:56     ` Ming Lei
2019-11-21  3:11 ` [PATCH V3 0/2] " Ming Lei
2019-11-21  6:14   ` Christoph Hellwig
2019-11-21  7:46     ` Ming Lei
2019-11-21 15:45       ` Keith Busch
2019-11-22  9:44         ` Ming Lei
2019-11-22  9:57           ` Christoph Hellwig
2019-11-22 10:25             ` Ming Lei
2019-11-22 14:04               ` Jens Axboe
2019-11-22 21:49                 ` Ming Lei
2019-11-22 21:58                   ` Jens Axboe
2019-11-22 22:30                     ` Ming Lei

Reply instructions:

You may reply publically 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=20191114025917.24634-1-ming.lei@redhat.com \
    --to=ming.lei@redhat.com \
    --cc=axboe@fb.com \
    --cc=edmund.nadolski@intel.com \
    --cc=hch@lst.de \
    --cc=kbusch@kernel.org \
    --cc=linux-nvme@lists.infradead.org \
    --cc=longli@microsoft.com \
    --cc=sagi@grimberg.me \
    /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

Linux-NVME Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-nvme/0 linux-nvme/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-nvme linux-nvme/ https://lore.kernel.org/linux-nvme \
		linux-nvme@lists.infradead.org
	public-inbox-index linux-nvme

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.infradead.lists.linux-nvme


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git