Excessive z/VM guest swapping

6.14 z/VM guest

Avoid excessive guest swapping by using the timed page pool size and the static page pool size attributes.

An instance of Linux® on z/VM® might be swapping and stalling. Setting the timed page pool size and the static page pool size to zero might solve the problem:

# echo 0 > /proc/sys/vm/cmm_timed_pages
# echo 0 > /proc/sys/vm/cmm_pages

If you see a temporary relief, the guest does not have enough memory. Try increasing the guest memory.

If the problem persists, z/VM might be out of memory.

If you are using cooperative memory management (CMM), unload the cooperative memory management module:

# modprobe -r cmm