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["Guilherme G. Piccoli" <1855409@xxxxxxxxxxxxxxxxxx>]

** Changed in: linux (Ubuntu Focal)
       Status: Incomplete => Fix Released

** Changed in: linux (Ubuntu Eoan)
       Status: Incomplete => Fix Released

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https://bugs.launchpad.net/bugs/1855409

Title:
  qede driver causes 100% CPU load

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Xenial:
  Invalid
Status in linux source package in Bionic:
  Confirmed
Status in linux source package in Disco:
  Confirmed
Status in linux source package in Eoan:
  Fix Released
Status in linux source package in Focal:
  Fix Released

Bug description:
  This bug is similar to #1832082 (bnx2x driver causes 100% CPU load)
  but applies for qede driver instead of bnx2x. The symptoms are the
  same:

  With chrony installed, and configured with "hwtimestamp *", I observe
  100% CPU load on 2 CPU cores.

  Running perf report shows that kernel is busy executing qede_ptp_task
  function in qede driver.

  A workaround is to disable "hwtimestamp *" in chrony configuration.

  ---

  $ modinfo qede
  filename:       /lib/modules/4.15.0-72-generic/kernel/drivers/net/ethernet/qlogic/qede/qede.ko
  version:        8.10.10.21
  license:        GPL
  description:    QLogic FastLinQ 4xxxx Ethernet Driver
  srcversion:     D5EC89D815FC81B973EE9F0
  alias:          pci:v00001077d00008090sv*sd*bc*sc*i*
  alias:          pci:v00001077d00008070sv*sd*bc*sc*i*
  alias:          pci:v00001077d00001664sv*sd*bc*sc*i*
  alias:          pci:v00001077d00001656sv*sd*bc*sc*i*
  alias:          pci:v00001077d00001654sv*sd*bc*sc*i*
  alias:          pci:v00001077d00001644sv*sd*bc*sc*i*
  alias:          pci:v00001077d00001636sv*sd*bc*sc*i*
  alias:          pci:v00001077d00001666sv*sd*bc*sc*i*
  alias:          pci:v00001077d00001634sv*sd*bc*sc*i*
  depends:        ptp,qed
  retpoline:      Y
  intree:         Y
  name:           qede
  vermagic:       4.15.0-72-generic SMP mod_unload 
  signat:         PKCS#7
  signer:         
  sig_key:        
  sig_hashalgo:   md4
  parm:           debug: Default debug msglevel (uint)

  
  $ uname -a
  Linux dcn1-clm-inf-1 4.15.0-72-generic #81-Ubuntu SMP Tue Nov 26 12:20:02 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux

  
  $ lspci | grep -i ether
  19:00.0 Ethernet controller: QLogic Corp. FastLinQ QL41000 Series 10/25/40/50GbE Controller (rev 02)
  19:00.1 Ethernet controller: QLogic Corp. FastLinQ QL41000 Series 10/25/40/50GbE Controller (rev 02)
  19:00.2 Ethernet controller: QLogic Corp. FastLinQ QL41000 Series 10/25/40/50GbE Controller (rev 02)
  19:00.3 Ethernet controller: QLogic Corp. FastLinQ QL41000 Series 10/25/40/50GbE Controller (rev 02)

  
  # perf report snippet:

    Children      Self  Command          Shared Object
  -   44.76%     0.00%  kworker/16:5     [kernel.kallsyms]
       ret_from_fork
     - kthread
        - 44.74% worker_thread
           - 44.57% process_one_work
              - 42.67% qede_ptp_task
                 - 38.86% qed_ptp_hw_read_tx_ts
                      qed_rd
                 - 3.03% queue_work_on
                    - 2.06% __queue_work
                       - 0.68% get_work_pool
                          - 0.61% radix_tree_lookup
                               __radix_tree_lookup
                0.50% set_work_pool_and_clear_pending

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