Public bug reported:
[Impact]
The tc/tbf and tc/htb burst option is currently limited to 4 GiB
(UINT_MAX for a 32-bit unsigned int). However, the kernel internally
represents burst as “time at the configured rate,” which allows for
bursts exceeding 4 GiB at high speeds. Due to this limitation, large
bursts that are valid in the kernel cannot be configured from userspace.
Conversely, smaller bursts can silently overflow the internal burst time
calculation, causing invalid values to be passed to the kernel without
detection, potentially resulting in misconfigured queues and incorrect
rate limiting.
[Test plan]
[Where problems could occur]
Externally, the main impact is that commands which previously caused
silent overflows may now produce errors or fail. This could break
scripts or automation that relied on the old behavior, though those
scripts were already misbehaving due to the invalid configuration.
** Affects: iproute2 (Ubuntu)
Importance: Undecided
Status: New
** Affects: iproute2 (Ubuntu Jammy)
Importance: Undecided
Status: New
** Affects: iproute2 (Ubuntu Noble)
Importance: Undecided
Status: New
** Affects: iproute2 (Ubuntu Questing)
Importance: Undecided
Status: New
** Affects: iproute2 (Ubuntu Resolute)
Importance: Undecided
Status: New
** Also affects: iproute2 (Ubuntu Resolute)
Importance: Undecided
Status: New
** Also affects: iproute2 (Ubuntu Jammy)
Importance: Undecided
Status: New
** Also affects: iproute2 (Ubuntu Noble)
Importance: Undecided
Status: New
** Also affects: iproute2 (Ubuntu Questing)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2147525
Title:
[SRU] tc/tbf, tc/htb: Burst parameter capped at 4GB even though kernel
can handle larger values
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