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kswapd hogging the CPU
Posted by: Theodore D. Sternberg
Posted on: Dec 23, 2015 12:30 PM
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aws , ec2 , linux , ubuntu
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98%! Very weird, as /usr/bin/top tells me that none of my swap is even in use. Not even close; of my 1Gb RAM, only 400Mb are even in use. Would my VM's kswapd be responding to physical memory scarcity on the host system?

I can see complaints about this sort of thing, here on the AWS forum, and out in the wide world too. Just complaints, unfortunately, no solutions.

This is on a t2.micro instance running Linux 4.2.0-19-generic (Ubuntu 15.10), in us-west-2c.

Edited by: Theodore D. Sternberg on Dec 23, 2015 12:32 PM
Permlink Replies: 2 | Pages: 1 - Last Post: Jan 18, 2016 6:00 AM by: Sean Groarke
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Re: kswapd hogging the CPU
Posted by: alex_e98765
Posted on: Jan 9, 2016 12:37 PM
in response to: Theodore D. Sternberg in response to: Theodore D. Sternberg
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Same here. Once per day it hits 100% cpu and consumes full credit balance. Instance restart helps till next time.

t2.micro
Latest Ubuntu 15.10 ami-7d948911 (4.2.0-23-generic)

Could be caused by this bug:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/721896

Still investigating.
Re: kswapd hogging the CPU
Posted by: Sean Groarke
Posted on: Jan 18, 2016 5:59 AM
in response to: alex_e98765 in response to: alex_e98765
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This is being quite vigorously pursued over here:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1518457

Worth a read. And after a few weeks it appears to be making progress on the root causes...

Edited by: Sean Groarke on Jan 18, 2016 6:00 AM