[Bug 1544094] Re: kworker 100% CPU usage on Xen PV (AWS)
Chad D, this bug report is being closed due to your last comment https://bugs.launchpad.net/ubuntu/+source/linux-lts- wily/+bug/1544094/comments/5 regarding this being fixed with an update. For future reference you can manage the status of your own bugs by clicking on the current status in the yellow line and then choosing a new status in the revealed drop down box. You can learn more about bug statuses at https://wiki.ubuntu.com/Bugs/Status. Thank you again for taking the time to report this bug and helping to make Ubuntu better. Please submit any future bugs you may find. ** Changed in: linux-lts-wily (Ubuntu) Status: Confirmed => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1544094 Title: kworker 100% CPU usage on Xen PV (AWS) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-lts-wily/+bug/1544094/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1544094] Re: kworker 100% CPU usage on Xen PV (AWS)
4.2.0-30-generic in ami-50bf8c3a (release 20160222) seems to have fixed it for me. Build scripts successfully completed an AMI with it. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1544094 Title: kworker 100% CPU usage on Xen PV (AWS) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-lts-wily/+bug/1544094/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1544094] Re: kworker 100% CPU usage on Xen PV (AWS)
ami-0567566f (release 20160217.1) is still affected. $ uptime ; uname -a ; cat /proc/interrupts 13:57:50 up 7 min, 1 user, load average: 1.01, 1.06, 0.61 Linux ip-192-168-119-211 4.2.0-27-generic #32-Ubuntu SMP Fri Jan 22 04:49:08 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux CPU0 0: 81530 xen-percpu-virq timer0 1: 0 xen-percpu-ipi spinlock0 2: 0 xen-percpu-ipi resched0 3: 0 xen-percpu-ipi callfunc0 4: 0 xen-percpu-virq debug0 5: 0 xen-percpu-ipi callfuncsingle0 6: 0 xen-percpu-ipi irqwork0 7:395 xen-dyn-event xenbus 8:283 xen-dyn-event rtc0 9: 6084 xen-dyn-event blkif 10:574 xen-dyn-event blkif 11: 1533 xen-dyn-event eth0 NMI: 0 Non-maskable interrupts LOC: 0 Local timer interrupts SPU: 0 Spurious interrupts PMI: 0 Performance monitoring interrupts IWI: 0 IRQ work interrupts RTR: 0 APIC ICR read retries RES: 0 Rescheduling interrupts CAL: 0 Function call interrupts TLB: 0 TLB shootdowns TRM: 0 Thermal event interrupts THR: 0 Threshold APIC interrupts DFR: 0 Deferred Error APIC interrupts MCE: 0 Machine check exceptions MCP: 0 Machine check polls HYP: 89928 Hypervisor callback interrupts ERR: 0 MIS: 0 PIN: 0 Posted-interrupt notification event PIW: 0 Posted-interrupt wakeup event Here's a bit of screen capture from top, later. The instance feels quite slow due to the competition with kworker and the steal time: top - 14:05:52 up 15 min, 1 user, load average: 1.26, 1.40, 0.95 Tasks: 68 total, 3 running, 65 sleeping, 0 stopped, 0 zombie %Cpu(s): 0.0 us, 58.3 sy, 0.0 ni, 0.0 id, 0.0 wa, 0.0 hi, 0.0 si, 41.7 st KiB Mem: 3837672 total, 345992 used, 3491680 free,12376 buffers KiB Swap:0 total,0 used,0 free. 261884 cached Mem PID USER PR NIVIRTRESSHR S %CPU %MEM TIME+ COMMAND 358 root 20 0 0 0 0 R 99.9 0.0 1:06.65 kworker/0:5 1918 ubuntu20 0 23576 3088 2660 R 0.3 0.1 0:00.03 top 1 root 20 0 37440 5496 3944 S 0.0 0.1 0:03.42 systemd 2 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kthreadd 3 root 20 0 0 0 0 S 0.0 0.0 0:00.00 ksoftirqd/0 4 root 20 0 0 0 0 S 0.0 0.0 13:19.18 kworker/0:0 5 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 kworker/0:0H 7 root 20 0 0 0 0 S 0.0 0.0 0:01.68 rcu_sched 8 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcu_bh 9 root 20 0 0 0 0 R 0.0 0.0 0:00.16 rcuos/0 10 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/0 11 root rt 0 0 0 0 S 0.0 0.0 0:00.00 migration/0 12 root rt 0 0 0 0 S 0.0 0.0 0:00.35 watchdog/0 13 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 khelper 14 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kdevtmpfs 15 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 netns 16 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 perf I was unable to run powertop on this instance; it exited with a suggestion to enable CONFIG_X86_MSR. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1544094 Title: kworker 100% CPU usage on Xen PV (AWS) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-lts-wily/+bug/1544094/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1544094] Re: kworker 100% CPU usage on Xen PV (AWS)
I've also observed this with the 4.2.0-25 kernel update. Currently working around it by installing an older kernel (4.2.0-19) and updating the 'default' in /boot/grub/menu.lst accordingly. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1544094 Title: kworker 100% CPU usage on Xen PV (AWS) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-lts-wily/+bug/1544094/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1544094] Re: kworker 100% CPU usage on Xen PV (AWS)
Status changed to 'Confirmed' because the bug affects multiple users. ** Changed in: linux-lts-wily (Ubuntu) Status: New => Confirmed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1544094 Title: kworker 100% CPU usage on Xen PV (AWS) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-lts-wily/+bug/1544094/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1544094] Re: kworker 100% CPU usage on Xen PV (AWS)
I'm going to add, it's the linux-image-4.2.0-27-generic that seems to be the issue. I specified that on the reporting form as the package, but the data doesn't seem to be visible on this bug. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1544094 Title: kworker 100% CPU usage on Xen PV (AWS) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-lts-wily/+bug/1544094/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
