** 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. https://lore.kernel.org/linux- pci/20200229030706.17835-1-helg...@kernel.org/ [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. + 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 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: In Progress 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 patches add the reporting capability. https://lore.kernel.org/linux- pci/20200229030706.17835-1-helg...@kernel.org/ [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
