** Changed in: linux (Ubuntu Focal)
Status: In Progress => Fix Committed
--
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1970798
Title:
32 GT/s PCI link speeds reporting "Unknown speed" in sysfs
Status in linux package in Ubuntu:
In Progress
Status in linux source package in Focal:
Fix Committed
Bug description:
SRU Justification
[Impact]
NVIDIA Collective Communication Library software uses sysfs to report
performance statistics. Users have reported entries showing "Unknown
speed" when they should be reporting "32 GT/s".
Example:
"<pci busid="0000:0c:00.0" class="0x020700" vendor="0x15b3" device="0x1021"
subsystem_vendor="0x15b3" subsystem_device="0x0082" link_speed="Unknown speed"
link_width="16">"
PCIe 5.0 supports 32 GT/s and is available in the 5.4 kernel, but the
patches for properly reporting speeds in sysfs are missing. The
following upstream v5.7 patches add the reporting capability.
PCI ML submission
https://lore.kernel.org/linux-pci/20200229030706.17835-1-helg...@kernel.org/
Upstream Patches
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=9cb3985af63555810bb07de50acdf4170771451d
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=e56faff57f0b39661093c00e0262d4ab9088830e
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=6348a34dcb98d8e285685a205f2a601817fa2d38
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=757bfaa2c3515803dde9a6728bbf8c8a3c5f098a
[Test Plan]
Testing these speeds requires special hardware. A Test kernel with
these patches applied was provided to the customer and they confirmed
the proper numbers are reported.
[Where problems could occur]
Changes are for reporting info so chance of problems should be low.
If a problem did occur it would be with sysfs or pcie driver
misreporting speeds.
[Other]
SF-00333784
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1970798/+subscriptions
--
Mailing list: https://launchpad.net/~kernel-packages
Post to : kernel-packages@lists.launchpad.net
Unsubscribe : https://launchpad.net/~kernel-packages
More help : https://help.launchpad.net/ListHelp
