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 NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
358 root 20 0 0 0 0 R 99.9 0.0 1:06.65 kworker/0:5
1918 ubuntu 20 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
[email protected]
https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
