Contents
How to tell which process is using kswapd so much?
I see kswapd using 100% CPU… how can I tell on which process’s behalf kswapd is being used so much? kswapd is managing swap space in response to memory demands greater than physically available for all processes.
Why does kswapd sleep at a low watermark?
Usually the kswapd sleeps. If the amount of free memory runs below a low watermark (pages_low), kswapd is woken up. It then tries to reclaim pages until a high watermark has been reached. If the system is under memory pressure, it can cause the kswapd scanning the available memory over and over again.
Why does kswapd wake up when memory is low?
If the amount of free memory runs below a low watermark (pages_low), kswapd is woken up. It then tries to reclaim pages until a high watermark has been reached. If the system is under memory pressure, it can cause the kswapd scanning the available memory over and over again.
Is there a problem with kswapd in Linux?
The problem exists on other distributions, but, as of writing, it’s unclear if the same fix works universally. Note that this will disable hotadding RAM/CPUs for Xen and Hyper-V virtual machines. There also seems to be a bug in kswapd somewhere, hopefully only on older kernels.
How to get rid of kswapd0 Io abuse?
To temporary trigger this bug, run dd bs=1M count=2000 if=/dev/zero of=file.spin and watch for kswapd0 IO abuse. Re: kswapd using 100% CPU, I don’t even have swap.
Is the process kswapd0 slower than the Ram?
The process kswapd0 is the process that manages virtual memory. Your machine should have RAM, SWAP, and the EXT4 on your HDD/SSD. The ext4 is where everything is stored, and it is always slower to access than RAM.
Which is faster, the ext4 or the kswapd0?
It is quicker to access than the EXT4, but it is much slower than actual RAM. When you run low on memory, kswapd0 moves programs that you are not using/not using as much as other programs to the SWAP, which causes extreme lag on those processes.