The kernel commit 9adebac37e7d ("qede: Handle infinite driver spinning
for Tx timestamp.") is present in kernels 5.3 and subsequent ones, and
after some preliminary results from @phausman, seems the commit properly
fixes the issue.Hence, we will start the SRU process for Bionic/Disco. Cheers, Guilherme -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. 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 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1855409/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
