SLES12SP4: Swapping Behavior

we have some strange swapping behavor.

Using SLES12SP3 we had no major swapping with vm.swappiness = 0

After Upgrading to SLES12SP4 we had some crashes because the operation system could'nt swap. We figure out that vm.swappiness = 0 disables swapping now. So we modify the parameter to vm.swappiness = 1, to enable swapping at all.
With SLES12SP4 and vm.swappiness = 1 we observe a more progressive swapping. The servers swaps out small amounts of memory, even if there is enough memory available. Especially updating with zypper creates a swap with few KB.

Do you have informations about that behaviour?



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