Ubuntu – What’s the purpose of kslowd

daemonUbuntuunix

I'm running Ubuntu 10.10:

uname -a
Linux mt-xps 2.6.35-22-generic #35-Ubuntu SMP Sat Oct 16 20:45:36 UTC 2010 x86_64 GNU/Linux

When I run top, I occasionally see a "kslowd000" or similar process popping up in the top CPU usage list. I've tried googling kslowd, but found no explanation to what it is. manpages also don't help.

What does it do ? And how would I find out myself ?

Best Answer

It's a kernel thread performing things that typically take a lot of time. For more information, see slow-work.txt.

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Missing etc/hosts file !

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You can install a new kernel upgrade on an Ubuntu instance on EC2 using:

sudo apt-get update &&
sudo apt-get dist-upgrade -y

Then, if all went well:

sudo reboot

The most recent released kernel for Ubuntu 10.10 on EC2 is

2.6.35-31-virtual

You might also consider upgrading to a more recent version of Ubuntu which comes with an even newer kernel. For example, Ubuntu 11.10 Oneiric currently runs this kernel after dist-upgrade:

3.0.0-14-virtual

Ubuntu 10.10 Maverick, which you are running, reaches its end of life in a few months (April 2012), so you'll need to upgrade to a newer release anyways.

Here's a bug report that may relate to the problem you're seeing:

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/666211

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