linux-nvme.lists.infradead.org archive mirror
 help / color / mirror / 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>,
	Keith Busch <kbusch@kernel.org>, Christoph Hellwig <hch@lst.de>
Subject: [PATCH V2 0/2] nvme-pci: check CQ after batch submission for Microsoft device
Date: Wed, 13 Nov 2019 21:42:46 +0800	[thread overview]
Message-ID: <20191113134248.26022-1-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.

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, 91 insertions(+), 13 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	other threads:[~2019-11-13 13:43 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-13 13:42 Ming Lei [this message]
2019-11-13 13:42 ` [PATCH V2 1/2] nvme-pci: move sq/cq_poll lock initialization into nvme_init_queue Ming Lei
2019-11-13 13:42 ` [PATCH V2 2/2] nvme-pci: check CQ after batch submission for Microsoft device Ming Lei
2019-11-13 15:53   ` Keith Busch
2019-11-14  1:30     ` Ming Lei
2019-11-14  1:39       ` Ming Lei
2019-11-13 23:11   ` Nadolski, Edmund
2019-11-14  1:34     ` Ming Lei

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=20191113134248.26022-1-ming.lei@redhat.com \
    --to=ming.lei@redhat.com \
    --cc=axboe@fb.com \
    --cc=hch@lst.de \
    --cc=kbusch@kernel.org \
    --cc=linux-nvme@lists.infradead.org \
    --cc=longli@microsoft.com \
    --cc=sagi@grimberg.me \
    --subject='Re: [PATCH V2 0/2] nvme-pci: check CQ after batch submission for Microsoft device' \
    /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

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).