Arch Linux

gonesoft

Member

Registered: 2016-01-25

Posts: 1

Re: kswapd using 100% CPU, I don't even have swap.

I was having this problem after a mobo change and what happened was that the Windoze VMs on the Jessie host had updated their network drivers and fell back to one deadly default: large send offload 60k. Google it - it's a rich source of performance issues. In my case, all I had to do was reconfigure large send offload to disabled inside the VMs.

There's a wonderful article here http://www.peerwisdom.org/2013/04/03/la … rformance/
that explains what was happening: the VM was happily sending large packets to the host which subsequently was busy dealing with all the fragmenting and resending business, clogging one CPU core to the max and grinding the whole system to a screeching halt.

x33a

Forum Fellow

Registered: 2009-08-15

Posts: 4,587

Re: kswapd using 100% CPU, I don't even have swap.

Hi everyone, I believe that this thread has outlived its usefulness. A lot has changed with the kernel since this thread was opened. If someone is facing a similar issue, please open a new thread.

Closing.