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From: Alex G <mr.nuke.me@gmail.com>
To: Alex Williamson <alex.williamson@redhat.com>,
	bhelgaas@google.com, helgaas@kernel.org,
	linux-pci@vger.kernel.org
Cc: austin_bolen@dell.com, alex_gagniuc@dellteam.com,
	keith.busch@intel.com, Shyam_Iyer@Dell.com, lukas@wunner.de,
	okaya@kernel.org, torvalds@linux-foundation.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH] PCI/LINK: Account for BW notification in vector calculation
Date: Mon, 22 Apr 2019 19:05:57 -0500	[thread overview]
Message-ID: <d1126250-14e0-192c-f219-f143f62c9cdd@gmail.com> (raw)
In-Reply-To: <155597243666.19387.1205950870601742062.stgit@gimli.home>

On 4/22/19 5:43 PM, Alex Williamson wrote:
> [  329.725607] vfio-pci 0000:07:00.0: 32.000 Gb/s available PCIe bandwidth,
> limited by 2.5 GT/s x16 link at 0000:00:02.0 (capable of 64.000 Gb/s with 5
> GT/s x16 link)
> [  708.151488] vfio-pci 0000:07:00.0: 32.000 Gb/s available PCIe bandwidth,
> limited by 2.5 GT/s x16 link at 0000:00:02.0 (capable of 64.000 Gb/s with 5
> GT/s x16 link)
> [  718.262959] vfio-pci 0000:07:00.0: 32.000 Gb/s available PCIe bandwidth,
> limited by 2.5 GT/s x16 link at 0000:00:02.0 (capable of 64.000 Gb/s with 5
> GT/s x16 link)
> [ 1138.124932] vfio-pci 0000:07:00.0: 32.000 Gb/s available PCIe bandwidth,
> limited by 2.5 GT/s x16 link at 0000:00:02.0 (capable of 64.000 Gb/s with 5
> GT/s x16 link)
> 
> What is the value of this nagging?

Good! The bandwidth notification service is working as intended. If this 
bothers you, you can unbind the device from the bandwidth notification 
driver:

echo 0000:07:00.0:pcie010 |
sudo tee /sys/bus/pci_express/drivers/pcie_bw_notification/unbind



> diff --git a/drivers/pci/pcie/portdrv_core.c b/drivers/pci/pcie/portdrv_core.c
> index 7d04f9d087a6..1b330129089f 100644
> --- a/drivers/pci/pcie/portdrv_core.c
> +++ b/drivers/pci/pcie/portdrv_core.c
> @@ -55,7 +55,8 @@ static int pcie_message_numbers(struct pci_dev *dev, int mask,
>   	 * 7.8.2, 7.10.10, 7.31.2.
>   	 */
>   
> -	if (mask & (PCIE_PORT_SERVICE_PME | PCIE_PORT_SERVICE_HP)) {
> +	if (mask & (PCIE_PORT_SERVICE_PME | PCIE_PORT_SERVICE_HP |
> +		    PCIE_PORT_SERVICE_BWNOTIF)) {
>   		pcie_capability_read_word(dev, PCI_EXP_FLAGS, &reg16);
>   		*pme = (reg16 & PCI_EXP_FLAGS_IRQ) >> 9;
>   		nvec = *pme + 1;

Good catch!

  reply	other threads:[~2019-04-23  0:06 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-04-22 22:43 Alex Williamson
2019-04-23  0:05 ` Alex G [this message]
2019-04-23  0:33   ` Alex Williamson
2019-04-23 14:33     ` Alex G
2019-04-23 15:34       ` Alex Williamson
2019-04-23 15:49         ` Lukas Wunner
2019-04-23 16:03         ` Alex G
2019-04-23 16:22           ` Alex Williamson
2019-04-23 16:27             ` Alex G
2019-04-23 16:37               ` Alex Williamson
2019-04-23 17:10       ` Bjorn Helgaas
2019-04-23 17:53         ` Alex G
2019-04-23 18:38           ` Alex Williamson
2019-04-23 17:59 ` Alex G
2019-05-01 20:30 ` Bjorn Helgaas

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