Note the "watchdog/0" thread you see is not the system monitoring
daemon. Rather it has a similar task for kernel scheduling:
http://linux-tips.org/t/what-is-kernel-soft-lockup/78
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Upgrading my system to kernel 3.8.0-31.46~precise1 (via the linux-image-
generic-lts-raring package) solved the issue with poor performance for
me.
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On my dual 8-core HT Dell R720 (32 virtual cores), watchdogs consume
lots of CPU, pushing load up over 80 regularly. Could be related to
https://bugzilla.kernel.org/show_bug.cgi?id=42981
** Bug watch added: Linux Kernel Bug Tracker #42981
http://bugzilla.kernel.org/show_bug.cgi?id=42981
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I'm on 13.04 in a Thinkpad T61. As of ~Sep 27 (I updated) the cursor
become jumpy, seems watchdog is to be blamed:
top - 10:50:36 up 14:05, 3 users, load average: 1.10, 1.41, 1.44
Tasks: 224 total, 2 running, 221 sleeping, 1 stopped, 0 zombie
%Cpu(s): 4.8 us, 18.5 sy, 0.3 ni, 75.1 id,
same here with 3.2.0-34-generic-pae dual core AMD, on Ubuntu 12.04,
both cores are at 100% for about a minute
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https://bugs.launchpad.net/bugs/1010855
Title:
watchdog/0 100% cpu usage
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: watchdog (Ubuntu)
Status: New = Confirmed
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https://bugs.launchpad.net/bugs/1010855
Title:
I have it since this week that watchdog/0 (seen in htop) eats my cpu.
Working with my laptop is not really possible. Last week it was working
fine.
** Attachment added: system monitor
https://bugs.launchpad.net/ubuntu/+source/watchdog/+bug/1010855/+attachment/3187573/+files/watchdog.png
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** Attachment added: incomplete dmesg . it takes many minutes to print it .
https://bugs.launchpad.net/bugs/1010855/+attachment/3182146/+files/dmesg.txt
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** Package changed: ubuntu = watchdog (Ubuntu)
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https://bugs.launchpad.net/bugs/1010855
Title:
watchdog/0 100% cpu usage
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