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From: Alex G <mr.nuke.me@gmail.com>
To: Alex Williamson <alex.williamson@redhat.com>
Cc: bhelgaas@google.com, helgaas@kernel.org,
	linux-pci@vger.kernel.org, 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: Tue, 23 Apr 2019 09:33:53 -0500	[thread overview]
Message-ID: <84300da7-9bbd-4f32-c7fa-23724db60b88@gmail.com> (raw)
In-Reply-To: <20190422183347.51ba522c@x1.home>

On 4/22/19 7:33 PM, Alex Williamson wrote:
> On Mon, 22 Apr 2019 19:05:57 -0500
> Alex G <mr.nuke.me@gmail.com> wrote:
>> echo 0000:07:00.0:pcie010 |
>> sudo tee /sys/bus/pci_express/drivers/pcie_bw_notification/unbind
> 
> That's a bad solution for users, this is meaningless tracking of a
> device whose driver is actively managing the link bandwidth for power
> purposes. 

0.5W savings on a 100+W GPU? I agree it's meaningless.

> There is nothing wrong happening here that needs to fill
> logs.  I thought maybe if I enabled notification of autonomous
> bandwidth changes that it might categorize these as something we could
> ignore, but it doesn't.
> How can we identify only cases where this is
> an erroneous/noteworthy situation?  Thanks,

You don't. Ethernet doesn't. USB doesn't. This logging behavior is 
consistent with every other subsystem that deals with multi-speed links. 
I realize some people are very resistant to change (and use very ancient 
kernels). I do not, however, agree that this is a sufficient argument to 
dis-unify behavior.

Alex

  reply	other threads:[~2019-04-23 14:33 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
2019-04-23  0:33   ` Alex Williamson
2019-04-23 14:33     ` Alex G [this message]
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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