[Bug 2129005] Re: tc class show dev change of behavior for values of burst and cburst

[Jorge Merlino]

** Also affects: openvswitch (Ubuntu Noble)
   Importance: Undecided
       Status: New

** Also affects: iproute2 (Ubuntu Noble)
   Importance: Undecided
       Status: New

** Also affects: ovn (Ubuntu Noble)
   Importance: Undecided
       Status: New

** Also affects: openvswitch (Ubuntu Jammy)
   Importance: Undecided
       Status: New

** Also affects: iproute2 (Ubuntu Jammy)
   Importance: Undecided
       Status: New

** Also affects: ovn (Ubuntu Jammy)
   Importance: Undecided
       Status: New

** Also affects: openvswitch (Ubuntu Questing)
   Importance: Undecided
       Status: New

** Also affects: iproute2 (Ubuntu Questing)
   Importance: Undecided
       Status: New

** Also affects: ovn (Ubuntu Questing)
   Importance: Undecided
       Status: New

** Also affects: openvswitch (Ubuntu Resolute)
   Importance: Undecided
       Status: Fix Committed

** Also affects: iproute2 (Ubuntu Resolute)
   Importance: Undecided
       Status: New

** Also affects: ovn (Ubuntu Resolute)
   Importance: Undecided
       Status: Fix Committed

** No longer affects: iproute2 (Ubuntu Jammy)

** No longer affects: iproute2 (Ubuntu Noble)

** No longer affects: iproute2 (Ubuntu Questing)

** No longer affects: iproute2 (Ubuntu Resolute)

** No longer affects: ovn (Ubuntu Jammy)

** No longer affects: ovn (Ubuntu Noble)

** No longer affects: ovn (Ubuntu Questing)

** No longer affects: ovn (Ubuntu Resolute)

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https://bugs.launchpad.net/bugs/2129005

Title:
  tc class show dev change of behavior for values of burst and cburst

Status in iproute2 package in Ubuntu:
  New
Status in openvswitch package in Ubuntu:
  Fix Committed
Status in ovn package in Ubuntu:
  Fix Committed
Status in openvswitch source package in Jammy:
  New
Status in openvswitch source package in Noble:
  New
Status in openvswitch source package in Questing:
  New
Status in openvswitch source package in Resolute:
  Fix Committed

Bug description:
  As detected by the ovn system testsuite the following test fails when
  upgrading iprotue2 from 6.14 to more recent versions:

      egress qos

  The command being executed by the testsuite is:

      tc class show dev ovs-public

  And the printed value becomes:

      class htb 1:2 parent 1:fffe prio 0 rate 12Kbit ceil 34359Mbit
  burst 375000b cburst 374933b

  While the expected output is:

      class htb 1:2 parent 1:fffe prio 0 rate 12Kbit ceil 34359Mbit
  burst 375000b cburst 373662b

  The issue appears to be present in iproute2 versions 6.17.0-1,
  6.16.0-1ubuntu2

  Downgrading to 6.14.0-1ubuntu1 makes the problem go away.

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