** Description changed:
- Our NCCL software uses the sysfs to populate the attached topo.xml file.
- Several of the entries should report "32 GT/s", but they're saying
- "Unknown speed" instead. For instance:
+ [Impact]
- <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">
+ 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".
- The 5.4 kernel is missing the following commit:
- https://lore.kernel.org/all/1581937984-40353-2-git-send-email-
- yangyic...@hisilicon.com/
+ 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 which supports 32 GT/s 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.
** Changed in: linux (Ubuntu Focal)
Status: Incomplete => In Progress
** Changed in: linux (Ubuntu)
Status: Incomplete => In Progress
** Changed in: linux (Ubuntu)
Importance: Undecided => High
** Changed in: linux (Ubuntu Focal)
Importance: Undecided => High
** 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 which supports 32 GT/s 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.
** 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 which supports 32 GT/s is available in the 5.4 kernel, but the
+ 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.
** Changed in: linux (Ubuntu)
Importance: High => Medium
** Changed in: linux (Ubuntu Focal)
Importance: High => Medium
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https://bugs.launchpad.net/bugs/1970798
Title:
32 GT/s PCI link speeds reporting "Unknown speed" in sysfs
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