PCI/LINK: Remove bandwidth notification

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The PCIe Bandwidth Change Notification feature logs messages when the link
bandwidth changes.  Some users have reported that these messages occur
often enough to significantly reduce NVMe performance.  GPUs also seem to
generate these messages.

We don't know why the link bandwidth changes, but in the reported cases
there's no indication that it's caused by hardware failures.

Remove the bandwidth change notifications for now.  Hopefully we can add
this back when we have a better understanding of why this happens and how
we can make the messages useful instead of overwhelming.

Link: https://lore.kernel.org/r/20200115221008.GA191037@google.com/
Link: https://lore.kernel.org/r/155605909349.3575.13433421148215616375.stgit@gimli.home/
Link: https://bugzilla.kernel.org/show_bug.cgi?id=206197
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

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This commit is contained in:

Bjorn Helgaas 2021-02-02 14:17:54 -06:00

parent 7c53f6b671

commit b4c7d2076b

5 changed files with 0 additions and 154 deletions

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8

drivers/pci/pcie/Kconfig

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1

drivers/pci/pcie/Makefile

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138

drivers/pci/pcie/bw_notification.c

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6

drivers/pci/pcie/portdrv.h

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1

drivers/pci/pcie/portdrv_pci.c

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