[SOLVED] Linux 5.10 CONFIG_PCIE_BW Is spamming dmesg

walecha · 12-20-2020, 10:30 AM

With Slackware enabling CONFIG_PCIE_BW in Linux 5.10.1, my dmesg get spammed with this message:

Code:

[  887.495904] nvme 0000:02:00.0: 15.752 Gb/s available PCIe bandwidth, limited by 8.0 GT/s PCIe x2 link at 0000:00:01.3 (capable of 31.504 Gb/s with 8.0 GT/s PCIe x4 link)
[  891.488760] nvme 0000:02:00.0: 15.752 Gb/s available PCIe bandwidth, limited by 8.0 GT/s PCIe x2 link at 0000:00:01.3 (capable of 31.504 Gb/s with 8.0 GT/s PCIe x4 link)

Although these messages are just warning (or less), it's pretty annoying because they spawn every now and then, my guess is every time when the storage is being polled. From my testing using this option with this kernel since rc1 version, the dmesg console will become full of these spam messages.

For now, I've rebuild the kernel with CONFIG_PCIE_BW disabled.

sovteq · 12-20-2020, 11:14 AM

I would say it is hardware issue. Maybe your nvme drive is broken? Or maybe the m.2 socket on the motherboard. Or maybe try to remove nvme drive and plug it again.

walecha · 12-20-2020, 07:14 PM

Quote:

Originally Posted by sovteq

I would say it is hardware issue. Maybe your nvme drive is broken? Or maybe the m.2 socket on the motherboard. Or maybe try to remove nvme drive and plug it again.

Nope. The spec of the motherboard said it is indeed a PCIE Gen3 x2.

From the kconfig documentation of the CONFIG_PCIE_BW

Code:

config PCIE_BW
	bool "PCI Express Bandwidth Change Notification"
	depends on PCIEPORTBUS
	help
	  This enables PCI Express Bandwidth Change Notification.  If
	  you know link width or rate changes occur only to correct
	  unreliable links, you may answer Y.

sovteq · 12-21-2020, 04:44 PM

Seems like Pat disabled this notification:

Quote:

Mon Dec 21 22:23:10 UTC 2020
k/kernel-source-5.10.2-noarch-1.txz: Upgraded.
-USB_SISUSBVGA_CON y
PCIE_BW y -> n
Thanks to walecha.

walecha · 12-21-2020, 07:20 PM

Quote:

Originally Posted by sovteq

Seems like Pat disabled this notification:

Thank you for the info

And thank you for disabling it, PV