On Ubuntu 12.04alpha1 Linux version 3.2.0-10-generic there is the problem with kworker, too. I have got HP Compaq 6005 Pro machines (same vendor as KP Stolk's machines), but it happens on different (non HP) hardware, too.
"/etc/init.d/networking stop" does not help. The problem is described in: http://billauer.co.il/blog/2010/10/disk-io-scheduler-load-dd-freeze-stall-hang/ I do: dd if=/dev/zero of=/tmp/zero1.tmp bs=1024 count=13000000 ... two kworker threads start using up nearly 100% CPU from the time the memory cache gets filled up, shown as "cached" in top: top - 18:20:57 up 2:44, 2 users, load average: 1.33, 0.50, 0.42 Tasks: 110 total, 3 running, 107 sleeping, 0 stopped, 0 zombie Cpu(s): 0.0%us, 49.8%sy, 0.0%ni, 50.2%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st Mem: 1791092k total, 1723636k used, 67456k free, 8k buffers Swap: 0k total, 0k used, 0k free, 1564360k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 4160 root 20 0 0 0 0 R 47 0.0 0:06.81 kworker/0:1 4217 root 20 0 0 0 0 R 47 0.0 0:06.12 kworker/1:0 4216 root 20 0 11500 632 516 D 5 0.0 0:38.42 dd 3281 root 20 0 17220 1240 904 R 0 0.1 0:11.11 top 4079 root 20 0 0 0 0 S 0 0.0 0:00.43 kworker/1:2 4093 root 20 0 0 0 0 S 0 0.0 0:00.21 kworker/0:0 1 root 20 0 24172 2016 1100 S 0 0.1 0:00.46 init Are there any solutions known right now? -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/887793 Title: Kworker constantly taking about 100% CPU To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/887793/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
