** Description changed: 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 patches add the reporting capability. + following upstream v5.7 patches add the reporting capability. - https://lore.kernel.org/linux- - pci/20200229030706.17835-1-helg...@kernel.org/ + 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
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1970798 Title: 32 GT/s PCI link speeds reporting "Unknown speed" in sysfs To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1970798/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
