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From: Keith Busch <kbusch@kernel.org>
To: linux-nvme@lists.infradead.org, hch@lst.de, sagi@grimberg.me
Cc: Keith Busch <kbusch@kernel.org>,
	bigeasy@linutronix.de, helgaas@kernel.org, ming.lei@redhat.com
Subject: [PATCH 0/4] nvme: Threaded interrupt handling improvements
Date: Thu, 28 Nov 2019 02:58:20 +0900
Message-ID: <20191127175824.1929-1-kbusch@kernel.org> (raw)

Threaded interrupts allow the device to continue sending interrupt
messages while the driver is handling the previous notification. This
can cause a significant amount of CPU cycles unnecessarily spent in hard
irq context, and potentially triggers spurious interrupt detection to
disable the nvme interrupt.

Use the appropriate masking for the interrupt type based on the NVMe
specification recommendations (see NVMe 1.4 section 7.5.1.1 for more
information).

The first patch just exports the fast MSIx masking so that low-depth
workloads don't suffer so much when using threaded interrupts.

The next two use the interrupt masking on the device for the different
types of interrupts.

The last patch is a performance improvement for high-depth workloads.

Keith Busch (4):
  PCI/MSI: Export __pci_msix_desc_mask_irq
  nvme/pci: Mask legacy and MSI in threaded handler
  nvme/pci: Mask MSIx interrupts for threaded handling
  nvme/pci: Spin threaded interrupt completions

 drivers/nvme/host/pci.c | 50 +++++++++++++++++++++++++++++++++++++++--
 drivers/pci/msi.c       |  1 +
 2 files changed, 49 insertions(+), 2 deletions(-)

-- 
2.21.0


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Thread overview: 37+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-27 17:58 Keith Busch [this message]
2019-11-27 17:58 ` [PATCH 1/4] PCI/MSI: Export __pci_msix_desc_mask_irq Keith Busch
2019-11-28  2:42   ` Sagi Grimberg
2019-11-28  3:41     ` Keith Busch
2019-11-28  7:17   ` Christoph Hellwig
2019-11-27 17:58 ` [PATCH 2/4] nvme/pci: Mask legacy and MSI in threaded handler Keith Busch
2019-11-28  3:39   ` Ming Lei
2019-11-28  3:48     ` Keith Busch
2019-11-28  3:58       ` Ming Lei
2019-11-28  4:14         ` Keith Busch
2019-11-28  8:41           ` Ming Lei
2019-11-27 17:58 ` [PATCH 3/4] nvme/pci: Mask MSIx interrupts for threaded handling Keith Busch
2019-11-28  7:19   ` Christoph Hellwig
2019-11-27 17:58 ` [PATCH 4/4] nvme/pci: Spin threaded interrupt completions Keith Busch
2019-11-28  2:46   ` Sagi Grimberg
2019-11-28  3:28     ` Keith Busch
2019-11-28  3:51       ` Ming Lei
2019-11-28  3:58         ` Keith Busch
2019-11-28  7:22   ` Christoph Hellwig
2019-11-29  9:13   ` Sebastian Andrzej Siewior
2019-11-30 18:10     ` Keith Busch
2019-12-02  1:10       ` Ming Lei
2019-12-02  1:30         ` Keith Busch
2019-12-02 16:51       ` Sebastian Andrzej Siewior
2019-11-28  7:50 ` [PATCH 0/4] nvme: Threaded interrupt handling improvements Christoph Hellwig
2019-11-28 17:59   ` Keith Busch
2019-11-29  8:30     ` Christoph Hellwig
2019-11-29  9:46 ` Sebastian Andrzej Siewior
2019-11-29 16:27   ` Keith Busch
2019-11-29 17:05     ` Sebastian Andrzej Siewior
2019-11-30 17:02       ` Keith Busch
2019-12-02 17:05         ` Sebastian Andrzej Siewior
2019-12-02 17:12           ` Christoph Hellwig
2019-12-02 18:06             ` Keith Busch
2019-12-03  7:40               ` Christoph Hellwig
2019-12-02 19:57             ` Sebastian Andrzej Siewior
2019-12-03  7:42               ` Christoph Hellwig

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