OpenWrt/LEDE Project

  • Status Unconfirmed
  • Percent Complete
    0%
  • Task Type Bug Report
  • Category Kernel
  • Assigned To No-one
  • Operating System All
  • Severity High
  • Priority Very Low
  • Reported Version Trunk
  • Due in Version Undecided
  • Due Date Undecided
  • Private
Attached to Project: OpenWrt/LEDE Project
Opened by Dave Täht - 30.08.2018

FS#1826 - FQ_codel is the wrong qdisc for the CAN bus

Supply the following if possible:
- Device problem occurs on
CAN bus
- Software versions of OpenWrt/LEDE release, packages, etc.
all
- Steps to reproduce

 bring up a can device that expects pfifo-fast, rather than noqueue

We finally had an edge case where fq_codel is totally the wrong thing.

https://marc.info/?l=linux-can&m=152785826628439&w=2

https://github.com/systemd/systemd/issues/9194

I don’t know how many can bus devices expect pfifo_fast, rather than noqueue. So far as I can tell the flow dissector doesn’t engage, so no FQ, but can is oft blocking bus so codel can drop more often than pfifo_fast does.

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